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  • Your email address will not be published.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

  • On-demand Event Event Date: September 10, 2014 Modern mobile applications connect systems-of-engagement (mobile apps) with systems-of-record (traditional IT) to deliver new and innovative business value. But the lifecycle for development of mobile apps is also new and different. Emerging trends in mobile development call for faster delivery of incremental features, coupled with feedback from the users of the app "in the wild." This loop of continuous delivery and continuous feedback is how the best mobile …

  • A modern mobile IT strategy is no longer an option, it is an absolute business necessity. Today's most productive employees are not tied to a desk, an office, or a location. They are mobile. And your company's IT strategy has to be ready to support them with easy, reliable, 24/7 access to the business information they need, from anywhere in the world, across a broad range of communication devices. Here's how some of the nation's most progressive corporations are meeting the many needs of their mobile workers …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds