7_2.rar_放大镜_放大镜 openCV

#include <windows.h> #include <string.h> #include <stdlib.h> #include <stdio.h> LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); HDC hdc; HDC hdcmem; HBITMAP hBm; BITMAP bm; int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { HWND hwnd; MSG Msg; WNDCLASS wndclass; char lpszClassName[]="位图"; char lpszTitle[]="Example_For_Bitmap"; wndclass.style=0; wndclass.lpfnWndProc =WndProc; wndclass.cbClsExtra =0; wndclass.cbWndExtra =0; wndclass.hInstance =hInstance; wndclass.hIcon =LoadIcon(NULL,IDI_APPLICATION); wndclass.hCursor =LoadCursor(NULL,IDC_ARROW); wndclass.hbrBackground =(HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.lpszMenuName =NULL; wndclass.lpszClassName =lpszClassName; if (!RegisterClass(&wndclass)) { MessageBeep(0); return FALSE; } hwnd=CreateWindow(lpszClassName, lpszTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); hBm=LoadBitmap(hInstance,"pic7_2"); GetObject(hBm,sizeof(BITMAP),(LPVOID)&bm); ShowWindow(hwnd,nCmdShow); UpdateWindow(hwnd); while(GetMessage(&Msg,NULL,0,0)) { TranslateMessage(&Msg); DispatchMessage(&Msg); } return Msg.wParam ; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; switch(message) { case WM_CREATE: hdc=GetDC(hwnd); hdcmem=CreateCompatibleDC(hdc); ReleaseDC(hwnd,hdc); break; case WM_PAINT: hdc=BeginPaint(hwnd,&ps); SelectObject(hdcmem,hBm); BitBlt(hdc,100,120,bm.bmWidth,bm.bmHeight ,hdcmem,0,0,SRCCOPY); //同一hdc也可以复制 BitBlt(hdc,200,320,bm.bmWidth,bm.bmHeight ,hdc,100,120,SRCCOPY); //缩小 StretchBlt(hdc,0,0,bm.bmWidth /2,bm.bmHeight /2,hdcmem,0,0,bm.bmWidth ,bm.bmHeight,SRCCOPY); //当然也可以放大 StretchBlt(hdc,200,300,bm.bmWidth,bm.bmHeight,hdcmem,0,0,bm.bmWidth/2 ,bm.bmHeight/2,SRCCOPY); EndPaint(hwnd,&ps); break; //放大图象 case WM_MOUSEMOVE: hdc=GetDC(hwnd); StretchBlt(hdc,200,300,100,100, hdc,LOWORD(lParam)-25,HIWORD(lParam)-25,50,50,SRCCOPY); ReleaseDC(hwnd,hdc); break; case WM_DESTROY: DeleteObject(hBm); PostQuitMessage(0); break; default: return DefWindowProc(hwnd,message,wParam,lParam); } return 0; }