Windows API: Saving DIB as BMP 2002-05-26 -- Jim Kane Newsgroups: softvelocity.products.c55ee
It depends on what you mean by bitmap. I'm guessing from the title of the
email that you mean a dib and have an hdib and not a hbitmap. you need to
add a small file header to the dib then write it to disk.
The code to add the file header is like this. the code was pull together
from two spots so it's possible I missed an equate or two.
BmpLibType.SaveDIB PROCEDURE (unsigned hdib, *cstring filename)
! Declare Procedure
bisizeimage long
bisize long
fhandle unsigned
byteswritten ulong
LphDib Long
hDibSize Long
hbmpfile unsigned
lpbmpfile Long
hbmpSize Long
BITMAPFILEHEADER GROUP
bfType ushort
bfSize ulong
bfReserved1 ushort
bfReserved2 ushort
bfOffbits ulong
END
bmfhSignature string(2),over(bitmapfileheader.bftype)
FILE_BEGIN equate(0)
FILE_SHARE_READ equate(1)
FILE_SHARE_WRITE equate(2)
FILE_ATTRIBUTE_NORMAL equate(80H)
FILE_ATTRIBUTE_TEMPORARY equate(100H)
FILE_FLAG_RANDOM_ACCESS equate(10000000H)
FILE_FLAG_SEQUENTIAL_SCAN equate(08000000H)
FILE_FLAG_DELETE_ON_CLOSE equate(04000000H)
GENERIC_READ equate(80000000H)
GENERIC_WRITE equate(40000000H)
GENERIC_EXECUTE equate(20000000H)
GENERIC_ALL equate(10000000H)
CREATE_NEW equate(1)
CREATE_ALWAYS equate(2)
OPEN_EXISTING equate(3)
OPEN_ALWAYS equate(4)
TRUNCATE_EXISTING equate(5)
CODE
hdibsize = GlobalSize(hdib)
lphdib = GlobalLock(hdib)
memcpy(address(biSizeImage),lphdib+20,4)
memcpy(address(bisize),lphdib,4)
Bitmapfileheader.bfOffBits = SIZE(BitmapFileHeader)+ |
bisize + self.PaletteSize(lphdib)
BitMapFileHeader.bfSize = bitmapfileheader.bfOffBits + biSizeImage
bmfhSignature = 'BM' ! STRING OVER bmfh.bfType
hbmpfile = GlobalAlloc(42H, BitMapFileHeader.bfSize)
If ~hbmpfile then globalunlock(hdib)
return(3)
End
lpbmpfile = GlobalLock(hbmpfile)
memcpy( lpbmpfile, address(bitmapfileHeader), Size(bitmapfileHeader))
memcpy( lpbmpfile + size(bitmapfileheader), lphdib, |
Bitmapfileheader.bfsize - size(bitmapfileheader))
hdibsize = BitMapFileHeader.bfSize
globalunlock(hdib)
fHandle=CreateFile(FileName,Generic_write,File_Share_Write,0, |
Create_Always,FILE_FLAG_SEQUENTIAL_SCAN,0)
if fhandle= 0FFFFFFFFH then
!message(getlasterror(),'Create File Error')
globalFree(hbmpfile)
return(3)
end
WriteFile(fhandle,lpbmpfile,hdibsize,byteswritten,0)
closehandle(fhandle)
globalfree(hbmpfile) !free memory
if byteswritten < hdibsize then
Return(3)
end
Return(0)
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