位图和位块传输(4)位图画刷与画画

位图同样可以用做画刷，例如博客位图和位块传输(3)中的墙，可以使用位图画刷来完成

//在WinMain函数中完成
HBITMAP hBitmap;
HBRUSH hBrush;
hBitmap=LoadBitmap(hInstance,MAKEINTRESOURCE(BITMAPID));
hBrush=CreatePatternBrush(hBitmap);
DeleteObject(hBitmap);
wndclass.hbrBackground=hBrush;

同样可以在位图上画画。

#include<windows.h>
#include"resource.h"
LRESULT CALLBACK WindowProc(
              HWND hwnd,      // handle to window
              UINT uMsg,      // message identifier
              WPARAM wParam,  // first message parameter
              LPARAM lParam   // second message parameter
              );
int WINAPI WinMain(
           HINSTANCE hInstance,      // handle to current instance
           HINSTANCE hPrevInstance,  // handle to previous instance
           LPSTR lpCmdLine,          // command line
           int nCmdShow              // show state
           )
{
  static TCHAR szAppName[]=TEXT("leidemingzi");
  MSG msg;
  HWND hwnd;
  WNDCLASS wndclass;
  wndclass.cbClsExtra=0;
  wndclass.cbWndExtra=0;
  wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
  wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
  wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);
  wndclass.hInstance=hInstance;
  wndclass.lpfnWndProc=WindowProc;
  wndclass.lpszClassName=szAppName;
  wndclass.lpszMenuName=NULL;
  wndclass.style=CS_HREDRAW|CS_VREDRAW;
  if(!RegisterClass(&wndclass))
  {
    MessageBox(NULL,TEXT("the program require the window nt"),TEXT("tips"),MB_ICONERROR);
    return 0;
  }
  hwnd=CreateWindow(
    szAppName,  // registered class name
    TEXT("this is title"), // window name
    WS_OVERLAPPEDWINDOW,        // window style
    CW_USEDEFAULT,                // horizontal position of window
    CW_USEDEFAULT,                // vertical position of window
    CW_USEDEFAULT,           // window width
    CW_USEDEFAULT,          // window height
    NULL,      // handle to parent or owner window
    NULL,          // menu handle or child identifier
    hInstance,  // handle to application instance
    NULL    // window-creation data
    );
  ShowWindow(hwnd,nCmdShow);
  UpdateWindow(hwnd);
  while(GetMessage(&msg,NULL,0,0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }

  return msg.wParam;
}
LRESULT CALLBACK WindowProc(
              HWND hwnd,      // handle to window
              UINT uMsg,      // message identifier
              WPARAM wParam,  // first message parameter
              LPARAM lParam   // second message parameter
              )
{
  static HBITMAP hBtimap;
  static HDC hdcMem;
  static int cxBitmap,cyBitmap,cxClient,cyClient,iSize=LARGE;
  HDC  hdc;
  static int zhuangtai;
  int x,y;
  PAINTSTRUCT ps;
  static SIZE size;
  static TCHAR *szText=TEXT(" Hello, world!! ");
  switch(uMsg)
  {
  case WM_CREATE:
    hdc=GetDC(hwnd);
    hdcMem=CreateCompatibleDC(hdc);
    GetTextExtentPoint32(hdc,szText,lstrlen(szText),&size);
    cxBitmap=size.cx;
    cyBitmap=size.cy;
    hBtimap = CreateCompatibleBitmap(hdc,cxBitmap,cyBitmap);
    ReleaseDC(hwnd,hdc);
    SelectObject(hdcMem,hBtimap);
    TextOut(hdcMem,0,0,szText,lstrlen(szText));

    return 0;
  case WM_SIZE:
    cxClient=LOWORD(lParam);
    cyClient=HIWORD(lParam);
    return 0;
  case WM_LBUTTONDOWN:
    zhuangtai=LARGE;
    return 0;
  case WM_RBUTTONDOWN:
    zhuangtai=SMALL;
    return 0;
  case WM_PAINT:
    hdc=BeginPaint(hwnd,&ps);
    switch(zhuangtai)
    {
    case LARGE:
      StretchBlt(hdc,0,0,cxClient,cyClient,hdcMem,0,0,cxBitmap,cyBitmap,SRCCOPY);
      break;
    case SMALL:
      for(y=0;y<cyClient;y+=cyBitmap)
        for(x=0;x<cxClient;x+=cxBitmap)
          BitBlt(hdc,x,y,cxBitmap,cyBitmap,hdcMem,0,0,SRCCOPY);
      break;
    }
    InvalidateRect(hwnd,NULL,FALSE);
    EndPaint(hwnd,&ps);
    return 0;
  case WM_DESTROY:
    DeleteDC(hdcMem);
    DeleteObject(hBtimap);
    PostQuitMessage(0);
    return 0;
  }
  return DefWindowProc(hwnd,uMsg,wParam,lParam);
}