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Thread: about LoadImage(): what images files can read?

  1. #1

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    PowerPoster joaquim's Avatar
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    about LoadImage(): what images files can read?

    what images files the Loadimage() can read?
    (i understand that can read ico, cur, ani(by 1 subimage at a time, because they are cur image format) and bmp. but other images like png, jpg, gif????)
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  2. #2
    Default Member Bonnie West's Avatar
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    Re: about LoadImage(): what images files can read?

    I believe PNG is supported only in icons, i.e., individual images in an icon compressed using the PNG format. The LoadImage's uType parameter clearly states that only the following image types are supported:


    Value Meaning
    IMAGE_BITMAP
    0
    Loads a bitmap.
    IMAGE_CURSOR
    2
    Loads a cursor.
    IMAGE_ICON
    1
    Loads an icon.
    On Local Error Resume Next: If Not Empty Is Nothing Then Do While Null: ReDim i(True To False) As Currency: Loop: Else Debug.Assert CCur(CLng(CInt(CBool(False Imp True Xor False Eqv True)))): Stop: On Local Error GoTo 0
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  3. #3

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    PowerPoster joaquim's Avatar
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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by Bonnie West View Post
    I believe PNG is supported only in icons, i.e., individual images in an icon compressed using the PNG format. The LoadImage's uType parameter clearly states that only the following image types are supported:


    Value Meaning
    IMAGE_BITMAP
    0
    Loads a bitmap.
    IMAGE_CURSOR
    2
    Loads a cursor.
    IMAGE_ICON
    1
    Loads an icon.
    and the gif's??? what format they have? or are independent?
    (my bad... the ani is read with LoadCursorFromFile() and DrawIconEx() and DestroyCursor()(after we don't need it)
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  4. #4
    Default Member Bonnie West's Avatar
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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by joaquim View Post
    and the gif's??? what format they have? or are independent?
    The GIF format is somewhat like PNG but LoadImage does not support it. Neither is JPEG.

    Quote Originally Posted by joaquim View Post
    (my bad... the ani is read with LoadCursorFromFile() and DrawIconEx() and DestroyCursor()(after we don't need it)
    LoadImage can, in fact, load animated cursors:

    Quote Originally Posted by MSDN
    Loads an icon, cursor, animated cursor, or bitmap.
    On Local Error Resume Next: If Not Empty Is Nothing Then Do While Null: ReDim i(True To False) As Currency: Loop: Else Debug.Assert CCur(CLng(CInt(CBool(False Imp True Xor False Eqv True)))): Stop: On Local Error GoTo 0
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  5. #5

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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by Bonnie West View Post
    The GIF format is somewhat like PNG but LoadImage does not support it. Neither is JPEG.



    LoadImage can, in fact, load animated cursors:
    ok, is there another API function for read the jpeg and png?
    i have code for read png but it's very complext for translate... so is there another API function?
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  6. #6
    Angel of Code Niya's Avatar
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    Re: about LoadImage(): what images files can read?

    Well GDI+ should be able to deal with PNGs but the API is a little more complicated that regular old GDI. If you're using VB6 and want PNG support then I recommend using the FreeImage library. I've used it in the past and its really great.
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  7. #7

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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by Niya View Post
    Well GDI+ should be able to deal with PNGs but the API is a little more complicated that regular old GDI. If you're using VB6 and want PNG support then I recommend using the FreeImage library. I've used it in the past and its really great.
    sorry.. in these case isn't for VB6, that's why i ask for another API function.
    anotherthing: what is metafile?
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  8. #8
    Default Member Bonnie West's Avatar
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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by joaquim View Post
    anotherthing: what is metafile?
    If I'm not mistaken, I think it's a file that describes another file.
    On Local Error Resume Next: If Not Empty Is Nothing Then Do While Null: ReDim i(True To False) As Currency: Loop: Else Debug.Assert CCur(CLng(CInt(CBool(False Imp True Xor False Eqv True)))): Stop: On Local Error GoTo 0
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  9. #9
    PowerPoster dunfiddlin's Avatar
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    Re: about LoadImage(): what images files can read?

    An image file essentially records the values and arrangement of pixels. A metafile is vector based. In other words it records instructions for drawing the image rather than the image itself. This is specifically designed to make scaling of the image over large ranges possible without quality loss which is why it has tended to be the format of choice for clipart, for example.
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  10. #10

    Thread Starter
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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by dunfiddlin View Post
    An image file essentially records the values and arrangement of pixels. A metafile is vector based. In other words it records instructions for drawing the image rather than the image itself. This is specifically designed to make scaling of the image over large ranges possible without quality loss which is why it has tended to be the format of choice for clipart, for example.
    thanks to all
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  11. #11
    Angel of Code Niya's Avatar
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    Re: about LoadImage(): what images files can read?

    Quote Originally Posted by joaquim View Post
    sorry.. in these case isn't for VB6, that's why i ask for another API function.
    anotherthing: what is metafile?
    Then I guess your only route may be GDI+.
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    There's just no reason to use garbage like InputBox. -jmcilhinney

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