[Vb6] AlphaBlend API function(strange result)

look these lines in UC:

Code:

---

'these if is for be changed
    If blnTransparentImage = True Then
        Dim BF As Long
        Const USE_BITMAP_ALPHA = &H1000000 'AC_SRC_ALPHA scaled up to the 4th byte of a long
        BF = 128 * &H10000  'semi transparent ignoring bitmaps alpha channel
        BF = 255 * &H10000 Or USE_BITMAP_ALPHA 'fully opaque using bitmaps alpha channel
        picGraphicsEffects.Picture = UserControl.Image
        AlphaBlend UserControl.hdc, 0, 0, UserControl.ScaleWidth, UserControl.ScaleHeight, picGraphicsEffects.hdc, 0, 0, picGraphicsEffects.ScaleWidth, picGraphicsEffects.ScaleHeight, BF
    End If
    'the next line is need too... when the shadow is desactivated
    UserControl.Picture = UserControl.Image
    PicAnimation(0).Tag = ""
    Call SubTransparent 'these sub is for put 1 color(backcolor) hide
    RaiseEvent ChangeImage(lngActualSubImage)

---

and theres the result(in image)....
why these strange result?
can anyone help?
thanks

it's one or the other for BF - can't use both- rem one out

Quote:

---

Originally Posted by technorobbo

it's one or the other for BF - can't use both- rem one out

---

Code:

---

'these if is for be changed
    If blnTransparentImage = True Then
        Dim BF As Long
        Const USE_BITMAP_ALPHA = &H1000000 'AC_SRC_ALPHA scaled up to the 4th byte of a long
        BF = 128 * &H10000  'semi transparent ignoring bitmaps alpha channel
        'BF = 255 * &H10000 Or USE_BITMAP_ALPHA 'fully opaque using bitmaps alpha channel
        picGraphicsEffects.Picture = UserControl.Image
        AlphaBlend UserControl.hdc, 0, 0, UserControl.ScaleWidth, UserControl.ScaleHeight, picGraphicsEffects.hdc, 0, 0, picGraphicsEffects.ScaleWidth, picGraphicsEffects.ScaleHeight, BF
    End If
    'the next line is need too... when the shadow is desactivated
    UserControl.Picture = UserControl.Image
    PicAnimation(0).Tag = ""
    Call SubTransparent
    RaiseEvent ChangeImage(lngActualSubImage)

---

it's diferent result, but continue with a problem:(
can you advice me?
(my objective is showing the image(in UC) Opaque)
thanks

you need to create an alpha channel - have a look at the upload for this thread:
http://www.vbforums.com/showthread.php?t=558319
Post #9 - I showed the guy how to use an alpha channel with 2 bmp's. Examples files included.

Quote:

---

Originally Posted by technorobbo

you need to create an alpha channel - have a look at the upload for this thread:
http://www.vbforums.com/showthread.php?t=558319
Post #9 - I showed the guy how to use an alpha channel with 2 bmp's. Examples files included.

---

i'm so sorry... but i'm confuse...
i have seen your project... but i don't understand how can i combine what you said and your project.... sorry...:(
what is the term "alpha channel"?
(i'm portuguese)
sorry...

Ok I'll do my best to explain:
Regular 24 bit bitmaps have 3 channels

1. Red
2. Green
3. Blue

Commonly known as RGB

Transparent 32 Bit bitmaps have 4 channels:

1. Red
2. Green
3. Blue
4. Alpha

The RGBA bitmap has a transparency channnel called alpha which is a black and white (gray scale) bitmap where the dark regions are transparent and the light regions are opaque.

In order to use the Alphablend function you have to load in a picture and an alpha channel and premultiply them together so the colors fade with the alpha channel.
Bit Map:
http://www.vbforums.com/attachment.p...8&d=1236313466

Alpha Channel:
http://www.vbforums.com/attachment.p...9&d=1236313478

The method of doing this is in the attached project. It also features a moving background which you stated you wanted to do in a different thread.

Try resizing the form as it runs

Quote:

---

Originally Posted by technorobbo

Ok I'll do my best to explain:
Regular 24 bit bitmaps have 3 channels

1. Red
2. Green
3. Blue

Commonly known as RGB

Transparent 32 Bit bitmaps have 4 channels:

1. Red
2. Green
3. Blue
4. Alpha

The RGBA bitmap has a transparency channnel called alpha which is a black and white (gray scale) bitmap where the dark regions are transparent and the light regions are opaque.

In order to use the Alphablend function you have to load in a picture and an alpha channel and premultiply them together so the colors fade with the alpha channel.
Bit Map:
http://www.vbforums.com/attachment.p...8&d=1236313466

Alpha Channel:
http://www.vbforums.com/attachment.p...9&d=1236313478

The method of doing this is in the attached project. It also features a moving background which you stated you wanted to do in a different thread.

Try resizing the form as it runs

---

ok.... now i catch what you mean(in back("the fire") of ship)....
but i don't understand how can i do it in my Sprite control(if you want i can put it here):(

Since the Windows handles painting the controls DC to the screen you have to Alphablend from the control to the parent, see the control example attached:

Quote:

---

Originally Posted by technorobbo

Since the Windows handles painting the controls DC to the screen you have to Alphablend from the control to the parent, see the control example attached:

---

thanks... but i'm so sorry tell you these: but it's possivel put the result in UC(is my objective)... i have the control, but the problem i don't understand how use it... it's very confuse.... LaVolte create it.... i will ask him...
i'm so sorry and thanks very much for help me...
(i'm realy sorry if i'm be rude with you:()

hi technorobbo
i have news:)
by your control i build these:

Code:

---

If blnTransparentImage = True Then
        Dim BF As Long
        Const USE_BITMAP_ALPHA = &H1000000 'AC_SRC_ALPHA scaled up to the 4th byte of a long
        'BF = 128 * &H10000  'semi transparent ignoring bitmaps alpha channel
        BF = 255 * &H10000 Or USE_BITMAP_ALPHA 'fully opaque
        AlphaBlend UserControl.hdc, 0, 0, UserControl.ScaleWidth, UserControl.ScaleHeight, UserControl.Parent.hdc, Extender.Left / Screen.TwipsPerPixelX, Extender.Top / Screen.TwipsPerPixelY, UserControl.ScaleWidth, UserControl.ScaleHeight, lBF
    End If

---

instead showed in form, i just showed in UC...
i can see positive results:)
but i have some problems(bugs):( can you help me fix them?
thanks

Whats the bugs?

Quote:

---

Originally Posted by technorobbo

Whats the bugs?

---

isn't what i expected... see the image...
-1 color that i don't want... the sprite backcolor;
-his by me, or the image order isn't right(1st must be the parent image then the sprite image)?
thanks

AlphaBlend has to be set to the parent of the control. Like this:

Code:

---

Private Sub UserControl_Paint()
Dim ar As Boolean
AlphaBlend UserControl.Parent.hdc, ScaleX(UserControl.Extender.Left, vbPixels, vbContainerPosition), _
    ScaleY(UserControl.Extender.Top, vbPixels, vbContainerPosition), _
        200, 125, Shdc, 0, 0, 200, 125, lBF
End Sub

---

This is from the example in pot #8. If the AlphaBlend is applied to the UC control instead, Windows will not transfer that alpha when it draws the control.

i have 1 project(i'm still not get right results:(), that i can use the alphablend() that can draw image and controls too, making an excelent opacy way;)
what i need is alphablend my control with anothers contols and without 1 color.
can anyone advice me?

i build my own TransparentAlphablend sub, but wihtout results:(

Code:

---

'how calculate the alpha values: a*rgb1 + (1-a)rgb2
Public Sub TransparentAlphaBlend(ByRef SrcPictureBox As Control, ByRef DstPictureBox As Control, ByRef Opacy As Integer, ByRef TransparentColor As Long)
    Dim x As Long, y As Long
    Dim lngNewColor As Long
    For x = 0 To DstPictureBox.ScaleWidth - 1
        For y = 0 To DstPictureBox.ScaleHeight - 1
            If GetPixel(DstPictureBox.hdc, x, y) <> Opacy Then
                lngNewColor = Opacy * GetPixel(DstPictureBox.hdc, x, y) + (1 - Opacy) * GetPixel(SrcPictureBox.hdc, x, y)
                SetPixel DstPictureBox, x, y, lngNewColor
            End If
        Next y
    Next x
End Sub

---

(the destination image has the front image, and the source has the back image)
but isn't working:(
can anyone advice me?
thanks

can i combine trasnparentblt() with alphablend() api function?

Quote:

---

Originally Posted by joaquim

can i combine trasnparentblt() with alphablend() api function?

---

Don't think so, you may have to manually process the pixels and then use AlphaBlend:

Option 1: test it, no guarantee it will work. I don't know if TransparentBlt modifies the alpha channel on a destination 32bpp DIB/bitmap.
1. Create offscreen 32bpp DIB section & DC
2. Fill the DIB with all zeros
3. Use TransparentBLT to draw your image to that DC
4. Now use AlphaBlend to draw that DC to your control/object
5. Destroy DC & DIB at some point

Option 2
1. Must use 32bpp DIB
2. For each pixel where the RGB value should be made transparent, set its RGBA value to zero (all 4 bytes of that pixel).
3. Now use AlphaBlend API
4. Destroy DIB at some point

Option 3
Using GDI+ this can be done. Though that does mean adding GDI+ APIs to your project and learning how to load an image into GDI+, along with using GdipSetImageAttributesColorKeys, GdipSetImageAttributesColorMatrix, and several more of the GDI+ APIs.

Quote:

---

Originally Posted by LaVolpe

Don't think so, you may have to manually process the pixels and then use AlphaBlend:

Option 1: test it, no guarantee it will work. I don't know if TransparentBlt modifies the alpha channel on a destination 32bpp DIB/bitmap.
1. Create offscreen 32bpp DIB section & DC
2. Fill the DIB with all zeros
3. Use TransparentBLT to draw your image to that DC
4. Now use AlphaBlend to draw that DC to your control/object
5. Destroy DC & DIB at some point

Option 2
1. Must use 32bpp DIB
2. For each pixel where the RGB value should be made transparent, set its RGBA value to zero (all 4 bytes of that pixel).
3. Now use AlphaBlend API
4. Destroy DIB at some point

Option 3
Using GDI+ this can be done. Though that does mean adding GDI+ APIs to your project and learning how to load an image into GDI+, along with using GdipSetImageAttributesColorKeys, GdipSetImageAttributesColorMatrix, and several more of the GDI+ APIs.

---

like you see, i have 1 sub:

Code:

---

'how calculate the alpha values: a*rgb1 + (1-a)rgb2
Public Sub TransparentAlphaBlend(ByRef SrcPictureBox As Control, ByRef DstPictureBox As Control, ByRef Opacy As Integer, ByRef TransparentColor As Long)
    Dim x As Long, y As Long
    Dim lngNewColor As Long
    For x = 0 To DstPictureBox.ScaleWidth - 1
        For y = 0 To DstPictureBox.ScaleHeight - 1
            If GetPixel(DstPictureBox.hdc, x, y) <> TransparentColor Then
                lngNewColor = Opacy * GetPixel(DstPictureBox.hdc, x, y) + (1 - Opacy) * GetPixel(SrcPictureBox.hdc, x, y)
                SetPixel DstPictureBox, x, y, lngNewColor
            End If
        Next y
    Next x
End Sub

---

(these sub is only for test, then i will convert it to DIB's;))
the problem is that i recive negative values. can you advice me?
for resolve that problem i use:

Code:

---

Public Sub TransparentAlphaBlend(ByRef SrcPictureBox As Control, ByRef DstPictureBox As Control, ByRef Opacy As Integer, ByRef TransparentColor As Long)
    Dim X As Long, Y As Long
    Dim lngNewColor As Long
    Dim BF As BLENDFUNCTION, lBF As Long
   
    With BF
        .BlendOp = AC_SRC_OVER
        .BlendFlags = 0
        .SourceConstantAlpha = Opacy
        .AlphaFormat = 0
    End With
    RtlMoveMemory lBF, BF, 4
    For X = 0 To DstPictureBox.ScaleWidth - 1
        For Y = 0 To SrcPictureBox.ScaleHeight - 1
            If GetPixel(DstPictureBox.hdc, X, Y) <> TransparentColor Then
                AlphaBlend SrcPictureBox.hdc, X, Y, 1, 1, DstPictureBox.hdc, X, Y, 1, 1, lBF
                'lngNewColor = Opacy * GetPixel(DstPictureBox.hdc, X, Y) + (1 - Opacy) * GetPixel(SrcPictureBox.hdc, X, Y)
                ''SetPixel DstPictureBox, X, Y, lngNewColor
            End If
        Next Y
    Next X
    DstPictureBox.Picture = DstPictureBox.Image
End Sub

---

GetPixel returning negative values means error. So either X,Y (must be in pixels not twips) are outside of the picturebox's scalewidth/height and/or the DstPictureBox.hDC is not visible if AutoRedraw=False.

Regarding negative values in your calculation...
1. You cannot use the alphablend formula on the pixel value, it must be used on each of the R, G, & B members.
2. So you have to separate the pixel into R, G, & B components first
3. Your calculation uses a range of 0-1 for opacity; therefore, you need to ensure Opacy is a value between 0 and 1. So....

Code:

---

Dim dblAlpha As Double, R As Long, G As Long, B As Long
Dim SrcRed As Long, SrcBlue As Long, SrcGreen As Long
Dim DstRed As Long, DstBlue As Long, DstGreen As Long

lNewColor =GetPixel(DstPictureBox.hdc, x, y)
dstRed = lNewColor And &HFF
dstGreen = (lNewColor\&H100&) And &HFF
dstBlue = (lNewColor\&H10000) And &HFF

lNewColor =GetPixel(SrcPictureBox.hdc, x, y)
SrcRed = lNewColor And &HFF
SrcGreen = (lNewColor\&H100&) And &HFF
SrcBlue = (lNewColor\&H10000) And &HFF

' If Opacy is a range between 0 and 255 then
        dblAlpha = Opacy/255
' If Opacy is a range between 0 and 100% then
        dblAlpha = Opacy/100
' If Opacy is a range between 0 and 1 then
        dblAlpha = Opacy
R =(dblAlpha*SrcRed) + (1-dblAlpha)*DstRed
G =(dblAlpha*SrcGreen) + (1-dblAlpha)*DstGreen
B =(dblAlpha*SrcBlue) + (1-dblAlpha)*DstBlue
lNewColor = RGB(R, G, B)

---

Code:

---

Option Explicit

Private Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long) As Long

Private Declare Function SetPixel Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal crColor As Long) As Long

Private Sub Command1_Click()
    TransparentAlphaBlend Picture2, Picture1, Val(Text1.Text), GetPixel(Picture2.hdc, 0, 0)
End Sub

Public Sub TransparentAlphaBlend(ByRef SrcPictureBox As Control, ByRef DstPictureBox As Control, ByRef Opacy As Integer, ByRef TransparentColor As Long)
    Dim X As Long, Y As Long
    Dim lngsrcColor As Long
    Dim lngdstColor As Long
    Dim lngNewColor As Long
    Dim dblAlpha As Double, R As Long, G As Long, B As Long
    Dim SrcRed As Long, SrcBlue As Long, SrcGreen As Long
    Dim DstRed As Long, DstBlue As Long, DstGreen As Long

    For X = 0 To DstPictureBox.ScaleWidth - 1
        For Y = 0 To DstPictureBox.ScaleHeight - 1
            lngdstColor = GetPixel(DstPictureBox.hdc, X, Y)
            lngsrcColor = GetPixel(SrcPictureBox.hdc, X, Y)
            If lngsrcColor <> TransparentColor Then
                DstRed = lngdstColor And &HFF
                DstGreen = (lngdstColor \ &H100&) And &HFF
                DstBlue = (lngdstColor \ &H10000) And &HFF
                SrcRed = lngsrcColor And &HFF
                SrcGreen = (lngsrcColor \ &H100&) And &HFF
                SrcBlue = (lngsrcColor \ &H10000) And &HFF
                   
                ' If Opacy is a range between 0 and 255 then
                'dblAlpha = Opacy / 255
                ' If Opacy is a range between 0 and 100% then
                dblAlpha = Opacy / 100
                ' If Opacy is a range between 0 and 1 then
                'dblAlpha = Opacy
                R = (dblAlpha * SrcRed) + (1 - dblAlpha) * DstRed
                G = (dblAlpha * SrcGreen) + (1 - dblAlpha) * DstGreen
                B = (dblAlpha * SrcBlue) + (1 - dblAlpha) * DstBlue
                lngNewColor = RGB(R, G, B)
                SetPixel DstPictureBox.hdc, X, Y, lngNewColor
            End If
        Next Y
    Next X
End Sub

---

its working... thanks
to be more precise... it's better if i put the source and destany dimenstion in heather sub, right?

You can speed it up by removing these lines from inside the loop to outside the loop, before the loop starts:
dblAlpha = Opacy / 100
And: cache value of (1 - dblAlpha) and use it in the R, G, B calculations. Maybe: dblAlphaSrc = Opacy/100: dblAlphaDst = 1-dblAlphaSrc

By making that small change you are doing 4 less math calculations per pixel

Quote:

---

Originally Posted by LaVolpe

You can speed it up by removing these lines from inside the loop to outside the loop, before the loop starts:
dblAlpha = Opacy / 100
And: cache value of (1 - dblAlpha) and use it in the R, G, B calculations. Maybe: dblAlphaSrc = Opacy/100: dblAlphaDst = 1-dblAlphaSrc

By making that small change you are doing 4 less math calculations per pixel

---

thanks for that tips(i think is the right word).
let me hask 1 think: for these be a good sub, is better build a more complete head sub(with dimensions)?
(for the error i can do a normal code: on error goto...)

I don't see anything wrong with the way you are doing it, other than it is much slower than using DIBs and doing the calculation directly to/from the DIB bytes. Anyway, calling a subroutine from within the loop will just make it slower still. Maybe I misunderstood.

Quote:

---

Originally Posted by LaVolpe

I don't see anything wrong with the way you are doing it, other than it is much slower than using DIBs and doing the calculation directly to/from the DIB bytes. Anyway, calling a subroutine from within the loop will just make it slower still. Maybe I misunderstood.

---

now i need help in these code:

Code:

---

.....
If Opacy > 0 Then
        Set picGraphicsEffects.Picture = Nothing
        'print everything that is in usercontrol parent(the container where the UC is), but i don't have sure if i recive the image:(
        ImageWithControls UserControl.Parent, picGraphicsEffects
        picGraphicsEffects.Picture = picGraphicsEffects.Image
        Load PicAnimation(PicAnimation.Count)
        'copy that image(by uc size and position) to picanimation
        BitBlt PicAnimation(PicAnimation.Count - 1).hDC, 0, 0, UserControl.width, UserControl.Height, picGraphicsEffects.hDC, lngOldPosX, lngOldPosY, vbSrcCopy
        Set picGraphicsEffects.Picture = Nothing
        picGraphicsEffects.Picture = PicAnimation(PicAnimation.Count - 1).Image
        PicAnimation(PicAnimation.Count - 1).Picture = UserControl.Image
        'combine the 2 images
        TransparentAlphaBlend PicAnimation(PicAnimation.Count - 1), picGraphicsEffects, CLng(m_Opacy), IFF(Transparent = TransparentNone, -1, lngTransparentColor)
        Unload PicAnimation(PicAnimation.Count - 1)
        UserControl.Picture = picGraphicsEffects.Image
    End If
.......

---

i don't recive right results:(

UserControl.width & UserControl.Height are in twips, use scalewidth/scaleheight
See if it was that simple. Otherwise, you will have to be more descriptive, we don't know what the wrong results look like nor do we know what the correct results should look like.

Quote:

---

Originally Posted by LaVolpe

UserControl.width & UserControl.Height are in twips, use scalewidth/scaleheight
See if it was that simple. Otherwise, you will have to be more descriptive, we don't know what the wrong results look like nor do we know what the correct results should look like.

---

see the image

Using LoadPictureGDI+(from my sig). You can load the image either into a DC/bitmap or into a .Picture object(or variable of type IPictureDisp), and use AlphaBlt to draw it. No pre-multiplying needed(assuming the image is a '32 bit'/'RGBA' TIF of PNG).

I just updated the attachment to do exactly what you want... I think. It's called AlphaTransBlt and it combines TransparentBlt with AlphaBlend!

Quote:

---

Originally Posted by FireXtol

Using LoadPictureGDI+(from my sig). You can load the image either into a DC/bitmap or into a .Picture object(or variable of type IPictureDisp), and use AlphaBlt to draw it. No pre-multiplying needed(assuming the image is a '32 bit'/'RGBA' TIF of PNG).

I just updated the attachment to do exactly what you want... I think. It's called AlphaTransBlt and it combines TransparentBlt with AlphaBlend!

---

1st - i need an image(with every controls(for that i use PrintWindows api function)) from parent(uc container);
2nd - my sub is slow, but i will convert it to DIB;)
but thanks

i belive that the problem is these line:

Code:

---

ImageWithControls UserControl.Parent, picGraphicsEffects

---

"usercontrol.parent", i belive is here. how can i obtine the parent image with controls?

Quote:

---

Originally Posted by joaquim

1st - i need an image(with every controls(for that i use PrintWindows api function)) from parent(uc container);
2nd - my sub is slow, but i will convert it to DIB;)
but thanks

---

Image(of Form or Picturebox, for instance) is also an IPictureDisp object.

I really don't see any reason why you'd want to use a DIB. Per-pixel calculations are comparatively slow. Creating the DIB from a bitmap, doing the calculations, and converting back to a bitmap is also a lot of overhead.

Quote:

---

Originally Posted by FireXtol

Image(of Form or Picturebox, for instance) is also an IPictureDisp object.

I really don't see any reason why you'd want to use a DIB. Per-pixel calculations are comparatively slow.

---

confuse... i don't know IPictureDisp object.
"I really don't see any reason why you'd want to use a DIB. Per-pixel calculations are comparatively slow."
i know, but i'm finish these code, then i will convert it;)

Quote:

---

Originally Posted by joaquim

confuse... i don't know IPictureDisp object.
"I really don't see any reason why you'd want to use a DIB. Per-pixel calculations are comparatively slow."
i know, but i'm finish these code, then i will convert it;)

---

Form.Image, Form.Picture, PictureBox.Image, PictureBox.Picture, UserControl.Image, PropertyPage.Image, UserDocument.Image, etc. These are all IPictureDisp objects.

IPictureDisp is a class. Its members include: Handle, Height, hPal, Render(method), Type, and Width.

GDI+ facilitates loading a 32 bpp image file(like PNG) such that AlphaBlend can immediately be used on the resulting dc/bitmap. Meaning you don't need any DIBs, and performance will be much better.

Quote:

---

Originally Posted by FireXtol

Form.Image, Form.Picture, PictureBox.Image, PictureBox.Picture, UserControl.Image, PropertyPage.Image, UserDocument.Image, etc. These are all IPictureDisp objects.

IPictureDisp is a class. Its members include: Handle, Height, hPal, Render(method), Type, and Width.

GDI+ facilitates loading a 32 bpp image file(like PNG) such that AlphaBlend can immediately be used on the resulting dc/bitmap. Meaning you don't need any DIBs, and performance will be much better.

---

sorry, can you PM me? do you have MSN?
i need more help for finish 1 thing;)

Quote:

---

Originally Posted by joaquim

now i need help in these code:

Code:

---

.....
If Opacy > 0 Then
        Set picGraphicsEffects.Picture = Nothing
        'print everything that is in usercontrol parent(the container where the UC is), but i don't have sure if i recive the image:(
        ImageWithControls UserControl.Parent, picGraphicsEffects
        picGraphicsEffects.Picture = picGraphicsEffects.Image
        Load PicAnimation(PicAnimation.Count)
        'copy that image(by uc size and position) to picanimation
        BitBlt PicAnimation(PicAnimation.Count - 1).hDC, 0, 0, UserControl.width, UserControl.Height, picGraphicsEffects.hDC, lngOldPosX, lngOldPosY, vbSrcCopy
        Set picGraphicsEffects.Picture = Nothing
        picGraphicsEffects.Picture = PicAnimation(PicAnimation.Count - 1).Image
        PicAnimation(PicAnimation.Count - 1).Picture = UserControl.Image
        'combine the 2 images
        TransparentAlphaBlend PicAnimation(PicAnimation.Count - 1), picGraphicsEffects, CLng(m_Opacy), IFF(Transparent = TransparentNone, -1, lngTransparentColor)
        Unload PicAnimation(PicAnimation.Count - 1)
        UserControl.Picture = picGraphicsEffects.Image
    End If
.......

---

i don't recive right results:(

---

I don't know what ImageWithControls does. Don't know what IFF is, a functional if is IIF. :confused:

.Parent will be passing what is likely the Form. (ImageWithControls UserControl.Parent, picGraphicsEffects)

Quote:

---

Originally Posted by FireXtol

I don't know what ImageWithControls does. Don't know what IFF is, a functional if is IIF. :confused:

.Parent will be passing what is likely the Form. (ImageWithControls UserControl.Parent, picGraphicsEffects)

---

Code:

---

Public Sub ImageWithControls(ByRef srcPicture As Variant, ByRef dstPicture As Variant)
    dstPicture.width = srcPicture.width
    dstPicture.Height = srcPicture.Height
    dstPicture.AutoRedraw = True
    PrintWindow srcPicture.hwnd, dstPicture.hDC, 0
    dstPicture.Refresh
End Sub

---

Code:

---

'Same people says that VB6(normal, without services packs(the my)) has these function, but i recive errors...
'is why i build these one
'these function is a diferent 'if' statement(is more or less the same, but build in same line;)).
Public Function IFF(Condiction As Boolean, TrueValue As Variant, FalseValue As Variant) As Variant
    If Condiction = True Then
        IFF = TrueValue
    Else
        IFF = FalseValue
    End If
End Function

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but i belive that i don't recive the image:(

ImageWithControls UserControl.Parent, picGraphicsEffects

UserControl.Parent is likely creating a reference to the form, is that the intention?

Try this: msgbox UserControl.Parent.Hwnd = Me.Hwnd

If it's true, you're indeed referencing the form. If that is not the intention, what is?

Quote:

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Originally Posted by FireXtol

ImageWithControls UserControl.Parent, picGraphicsEffects

UserControl.Parent is likely creating a reference to the form, is that the intention?

Try this: msgbox UserControl.Parent.Hwnd = Me.Hwnd

If it's true, you're indeed referencing the form. If that is not the intention, what is?

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isn't from form, but the Usercontrol container(can be a picturebox;))

Then use Container, and not Parent. The Parent is the form. It's not the Picturebox.

Just try it! Add, for instance, a command button to a picturebox and try the following:
Debug.Print Command1.Parent.hWnd, Command1.Container.hWnd
Debug.Print Form1.hWnd, Picture1.hWnd

Results:

Code:

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10617990      3736964
 10617990      3736964

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technorobbo, please mail me. thanks