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 thread  Author  Topic: Size of a BMP Image  (Read 418 times)
Jack Kelly
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xx Size of a BMP Image
« Thread started on: Oct 2nd, 2015, 5:49pm »

Does anyone know how to determine the pixel dimensions of a .BMP image so it can be centered with the DrawBMP command if desired?
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tsh73
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xx Re: Size of a BMP Image
« Reply #1 on: Oct 2nd, 2015, 6:14pm »

http://lbpe.wikispaces.com/GraphicDimensions
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Richard Russell
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xx Re: Size of a BMP Image
« Reply #2 on: Oct 2nd, 2015, 7:42pm »

on Oct 2nd, 2015, 5:49pm, Jack Kelly wrote:
Does anyone know how to determine the pixel dimensions of a .BMP image so it can be centered with the DrawBMP command if desired?

Here you go:

Code:
    loadbmp "bitmap", "myimage.bmp"
    hbitmap = hbmp("bitmap")
    struct bitmap, bmType as long, bmWidth as long, bmHeight as long, _
      bmWidthBytes as long, bmPlanes as short, bmBitsPixel as short, _
      bmBits as ulong
    bitmaplen = len(bitmap.struct)
    calldll #gdi32, "GetObjectA", hbitmap as ulong, _
      bitmaplen as long, bitmap as struct, ret as long
    print "Width is "; bitmap.bmWidth.struct
    print "Height is "; bitmap.bmHeight.struct 

I'm personally not keen on methods that involve peeking the file, and since you're likely to want to loadbmp the image anyway the above method seems more direct.

Richard.
« Last Edit: Oct 2nd, 2015, 7:45pm by Richard Russell » User IP Logged

Jack Kelly
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xx Re: Size of a BMP Image
« Reply #3 on: Oct 3rd, 2015, 07:01am »

Thank you both for your suggestions. Both methods look good to me. As always, your help is greatly appreciated.
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