Creating Color Bitmap From Scratch

Environment:VC6

How do you create a color bitmap from scratch? You need to be able to make the bitmap without .bmp file or resource. Using CreateBitmap or CreateBitmapIndirect creates monochrome bitmaps, unless you have HDC that can handle color bitmaps. However, creating HDC by CreateCompatibleDC(NULL) gives you simple HDC that contains 1x1 monochrome bitmap. Following is the source code shows how to create color bitmap from scratch using CreateDIBSection:

HDC dc= CreateCompatibleDC(NULL);
BITMAPINFO i;
ZeroMemory( &i.bmiHeader, sizeof(BITMAPINFOHEADER) );
i.bmiHeader.biWidth=5;     // Set size you need
i.bmiHeader.biHeight=5;    // Set size you need
i.bmiHeader.biPlanes=1;
i.bmiHeader.biBitCount=24; // Can be 8, 16, 32 bpp or 
                           // other number
i.bmiHeader.biSizeImage=0;
i.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
i.bmiHeader.biClrUsed= 0;
i.bmiHeader.biClrImportant= 0;
VOID *pvBits;
HBITMAP hbmp= CreateDIBSection( dc,
                                &i,
                                DIB_RGB_COLORS,
                                &pvBits,
                                NULL,
                                0 );
// You don't have to use 'pvBits', later DeleteObject(hbmp)
// will free this bit array.


Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: September 17, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT Another day, another end-of-support deadline. You've heard enough about the hazards of not migrating to Windows Server 2008 or 2012. What you may not know is that there's plenty in it for you and your business, like increased automation and performance, time-saving technical features, and a lower total cost of ownership. Check out this upcoming eSeminar and join Rich Holmes, Pomeroy's practice director of virtualization, as he discusses the …

  • Java developers know that testing code changes can be a huge pain, and waiting for an application to redeploy after a code fix can take an eternity. Wouldn't it be great if you could see your code changes immediately, fine-tune, debug, explore and deploy code without waiting for ages? In this white paper, find out how that's possible with a Java plugin that drastically changes the way you develop, test and run Java applications. Discover the advantages of this plugin, and the changes you can expect to see …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds