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CreateBitmap info  Overview  Group

The CreateBitmap function creates a bitmap with the specified width, height, and color format (color planes and bits per pixel).

HBITMAP CreateBitmap(

    int nWidth,

// bitmap width, in pixels

    int nHeight,

// bitmap height, in pixels

    UINT cPlanes,

// number of color planes used by device

    UINT cBitsPerPel,

// number of bits required to identify a color

    CONST VOID *lpvBits 

// pointer to array containing color data

   );

Parameters

nWidth
Specifies the bitmap width, in pixels.
nHeight
Specifies the bitmap height, in pixels.
cPlanes
Specifies the number of color planes used by the device.
cBitsPerPel
Specifies the number of bits required to identify the color of a single pixel.
lpvBits
Points to an array of color data used to set the colors in a rectangle of pixels. Each scan line in the rectangle must be word aligned (scan lines that are not word aligned must be padded with zeros). If this parameter is NULL, the new bitmap is undefined.

Return Values

If the function succeeds, the return value is a handle to a bitmap.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

Remarks

After a bitmap is created, it can be selected into a device context by calling the SelectObject function.

While the CreateBitmap function can be used to create color bitmaps, for performance reasons applications should use CreateBitmap to create monochrome bitmaps and CreateCompatibleBitmap to create color bitmaps. When a color bitmap returned from CreateBitmap is selected into a device context, Windows must ensure that the bitmap matches the format of the device context it is being selected into. Since CreateCompatibleBitmap takes a device context, it returns a bitmap that has the same format as the specified device context. Because of this, subsequent calls to SelectObject are faster than with a color bitmap returned from CreateBitmap.

If the bitmap is monochrome, zeros represent the foreground color and ones represent the background color for the destination device context.

If an application sets the nWidth or nHeight parameters to zero, CreateBitmap returns the handle of a 1- by 1-pixel, monochrome bitmap.

When you no longer need the bitmap, call the DeleteObject function to delete it.

See Also

CreateBitmapIndirect, CreateCompatibleBitmap, CreateDIBitmap, DeleteObject, GetBitmapBits, SelectObject, SetBitmapBits 

See:

See also:


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