Windows Programming: Bitmap display

In WIN32, the steps to display a bitmap on a window have some complicated

Instead of drawing the image line directly on the window, it is displayed on the window by a memory handle call

To display a bitmap on a form, first move the bitmap into the resource view

load Bitmap resource: Load bitmap in Resource View

static Hbitmap hbitmap;  Bitmap handle
static BITMAP BITMAP;    Bitmap structure Body

The bitmap structure body is defined as follows:

typedef struct TAGBITMAP
  {
    LONG        bmtype;  Bitmap type
    long        bmwidth;//bitmap
    width        long bmheight;  Bitmap height
    LONG        bmwidthbytes;  Width of the byte
    WORD        bmplanes;
    WORD        bmbitspixel;//Pixel
    lpvoid      bmbits
  } BITMAP, *pbitmap, NEAR *npbitmap, FAR *lpbitmap;

Load bitmap: Loading when the window is created

Case Wm_create:
	{
		hbitmap = LoadBitmap (hinst, Makeintresource (idb_future));  Get bitmap handle
		GetObject (hbitmap, sizeof (BITMAP), &bitmap);  Pass the bitmap handle to the bitmap structure
		
		//Get the width and height of the bitmap
		cxbitmap = bitmap.bmwidth;
		Cybitmap = bitmap.bmheight;

	} Break

To create a Memory environment device:

bitmaps, like windows, specifically require a handle that holds bitmaps, called Bitmap memory dc

HDC Hdcmem;   Bitmap Memory DC

Select a bitmap into a memory DC for drawing on a form

SelectObject (Hdcmem, hbitmap);    To select a bitmap into a memory DC

drawing using the BitBlt () function

Copy the bitmap in the memory DC to the window DC display
BITBLT (hdc, MB, Cxbitmap, Cybitmap, hdcmem,0,0,srccopy);  Execute in a copy way

Parameter description: HDC is a window handle

200,200 indicates the starting coordinates of the drawn window (that is, from where the window is drawn)

Cxbitmap and Cybitmap are the size of the bitmap,

0,0 represents a coordinate on a bitmap on which the program will start drawing

Srccopy represents performing operations in a copy way

Effect: