how to load png image into memory

I am currently loading bmp pictures in my program, but they are big files, how can I load png into the program for bitbliting?

Re-save the images as PNG's instead then use the same method to load them as you did before.

i did that but it dosent load them in the memory, i get no picture. Uh better advice would be nice, this is what i have

VB Code:

'
'Chapter 1
'Memory Device Context
'
 
Option Explicit
 
Public Declare Function TimeGetTime Lib "winmm.dll" () As Long
Public Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer
Public Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Public Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Public Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function LoadImage Lib "user32" Alias "LoadImageA" (ByVal hInst As Long, ByVal lpsz As String, ByVal un1 As Long, ByVal n1 As Long, ByVal n2 As Long, ByVal un2 As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
 
'Constants for the GenerateDC function
'**LoadImage Constants**
Global Const IMAGE_BITMAP As Long = 0
Global Const LR_LOADFROMFILE As Long = &H10
Global Const LR_CREATEDIBSECTION As Long = &H2000
Global Const LR_DEFAULTSIZE As Long = &H40
Global Const KEY_TOGGLED As Integer = &H1
Global Const KEY_DOWN As Integer = &H1000
 
'****************************************
Global Const SpriteWidth As Long = 50
Global Const SpriteHeight As Long = 50
Global time
Global endmap, i
Global nextmapright, mapright, looploop
Global error
Global DC As Long
Global hBitmap As Long
 
Public Sub spriteload()
sprnum = 4
 
 iFileNo = FreeFile
     'open the file for reading
  
 
    For z = 1 To 5 'reads all maps and saves them into array
        Open "x:\mygame\map(" & z & ").txt" For Input As #iFileNo
    For y = 1 To 11
    For x = 1 To 15
        Input #iFileNo, map0(z, x, y) 'reads map information
    Next
    Next
        Close #iFileNo  'close the file (if you dont do this, you wont be able to open it again!)
    Next
  z = 0
DeleteGeneratedDC grass(0) 'Generate the two DCs, one for the mask and one for the sprite
DeleteGeneratedDC grass(1)
'generates all sprites (one line!!!)
 
66
    For i = 0 To sprnum
        grass(i) = GenerateDC("x:\mygame\grass(" & i & ").bmp") 'png dosent work
    Next
'checks for errors and loads up to 10 times
    For i = 0 To sprnum
        If grass(i) <= 0 Then
        error = error + 1
    If error = 200 Then Exit Sub
        GoTo 66
    End If
    Next
 
    End Sub
'Deletes a generated DC
Public Function DeleteGeneratedDC(DC As Long) As Long
 
If DC > 0 Then
    DeleteGeneratedDC = DeleteDC(DC)
Else
    DeleteGeneratedDC = 0
End If
 
End Function
'IN: FileName: The file name of the graphics
'OUT: The Generated DC
Public Function GenerateDC(FileName As String) As Long
 
 
'Create a Device Context, compatible with the screen
DC = CreateCompatibleDC(0)
 
If DC < 1 Then
    GenerateDC = 0
    Exit Function
End If
 
'Load the image....BIG NOTE: This function is not supported under NT, there you can not
'specify the LR_LOADFROMFILE flag
hBitmap = LoadImage(0, FileName, IMAGE_BITMAP, 0, 0, LR_DEFAULTSIZE Or LR_LOADFROMFILE Or LR_CREATEDIBSECTION)
 
If hBitmap = 0 Then 'Failure in loading bitmap
    DeleteDC DC
    GenerateDC = 0
    Exit Function
End If
 
'Throw the Bitmap into the Device Context
SelectObject DC, hBitmap
 
'Return the device context
GenerateDC = DC
 
'Delte the bitmap handle object
DeleteObject hBitmap
 
End Function

thats what i have i dont know if that helps? I dont know how to do it

Quote:

---

Originally Posted by damasterjo

Uh better advice would be nice

---

Yes, it would be, wouldn't it? What a shame you're not getting it from me. If you are going to be so vague with your questions then you could at least be polite when some help is offered.

im sorry i am not very tactful. I guess the question was vague and I did not specify that i was loading the images to the memory. But whatever if you dont want to help i understand. Anybody else have any idea?

It should also be said that the vbcode tags around your code would be nice, to help read it.

Perhaps IMAGE_BITMAP isn't what you require. Forgotten the values of the others, but it should be on these forums or the internet somewhere.

chem

that is probably the problem but im not sure what it is sopost to be.?