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Old March 13th, 2006, 02:29 PM
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Default hex conversion to binary files

Hi all,
  I'm working on a project that requires me to produce .bmp files from data that produced by another program that I'm working on. The other program is working fine.

I have hex values defined as shown

bfType1 = 0x42; // char
bfType2 = 0x4D; // char
bfSize = 0x00000000; //long
bfReserved1 = 0x0000; //short
bfReserved2 = 0x0000; //short
bfOffBits = 0x36; //long
biSize = 0x28; //long
biWidth = 0x0000000A; //long
biHeight = 0x0000000A; //long
biPlanes = 0x0001; //short
biBitCount = 0x0018; //short
biCompression = 0x00000000; //long
biSizeImage = 0x00000000; //long
biXPelsPerMeter = 0x00000000; //long
biYPelsPerMeter = 0x00000000; //long
biClrUsed = 0x00000000; //long
biClrImportant = 0x00000000; //long

I'm trying to write these to a file and the output is wrong. The first two char's are fine. My output code is

ofstream fout("helloworld.bmp",ios::binary);

    fout << bfType1 << bfType2 << bfSize << bfReserved1 << bfReserved2 << bfOffBits << bfSize
        << biWidth << biHeight << biPlanes << biBitCount << biCompression << biSizeImage
        << biXPelsPerMeter << biYPelsPerMeter << biClrUsed << biClrImportant ;

and the actual output I am getting (in ascii) is


Any auggestions? My source for the header info is from a Delphi mnaual, which doesn't look like (to someone who's never touched delphi and is new to c++) it has to use any modifiers to convert from hex into binary.

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Old March 15th, 2006, 06:06 PM
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I've found a way round what I wanted to do.
I've created a valid bmp header in a graphics program, and ow I just copy that header to a new file and append my data to the end.
I'v limited myself to all combinations of 3 intensities, so that gives me 27 colours, which I just write in ascii, ie if I want a nice royal blue, which is hex code 0x21217E I actually write "~!!" (bmps read as BGR) to the file.

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