API窗口对不同组合键的响应

#include <windows.h> #include <string.h> #include <stdlib.h> #include <stdio.h> LRESULT CALLBACK WndProc(HWND hwnd,UINT message,UINT wParam,LONG lParam); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow){ HWND hwnd; MSG Msg; WNDCLASS wndclass; char lpszClassName[]="基本绘图"; char lpszTitle[]="四川师范大学计算机科学学院"; 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 ); 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,UINT wParam,LONG lParam){ static long nXchar,nYchar; int x=0,y=0; HDC hDC; HPEN hPen; HBRUSH hBrush; TEXTMETRIC tm; PAINTSTRUCT PtStr; static char textbuf0[]="you had hitted Up key"; static char textbuf1[]="you had hitted Shift key"; static char textbuf2[]="you had hitted Ctrl key"; static char textbuf3[]="you had hitted Shift+B key"; static char textbuf4[]="you had hitted Ctrl+A key"; //static char textbuf5[]=" "; static bool nupdown=false; static bool nshiftdown=false; static bool nctrldown=false; static bool nctrladown=false; static bool nshiftbdown=false; switch(message){ case WM_KEYDOWN: switch(wParam){ case VK_UP: nupdown=true; break; case VK_SHIFT: nshiftdown=true; break; case VK_CONTROL: nctrldown=true; break; default : break; } case WM_CHAR: if(wParam=='B'||wParam=='b'){ if(nshiftdown){ nshiftdown=false; nshiftbdown=true; } } else if(wParam=='a'||wParam=='A'){ if(nctrldown){ nctrldown=false; nctrladown=true; } } break; case WM_KEYUP: if(nupdown) InvalidateRect(hwnd,NULL,true); if(nshiftdown) InvalidateRect(hwnd,NULL,true); if(nctrldown) InvalidateRect(hwnd,NULL,true); if(nshiftbdown) InvalidateRect(hwnd,NULL,true); if(nctrladown) InvalidateRect(hwnd,NULL,true); //break; case WM_PAINT: hDC=BeginPaint(hwnd,&PtStr); hBrush = (HBRUSH)GetStockObject(WHITE_BRUSH); hPen = (HPEN)GetStockObject(WHITE_PEN); SelectObject(hDC,hPen); SelectObject(hDC,hBrush); SetTextColor(hDC,RGB(255,0,0)); GetTextMetrics(hDC,&tm); nXchar=tm.tmAveCharWidth; nYchar=tm.tmHeight+tm.tmExternalLeading; x=nXchar; //Rectangle(hDC,0,0,300,200); if(nupdown){ y=nYchar*0; TextOut(hDC,x,y,textbuf0,lstrlen(textbuf0)); nupdown=false; } else if(nshiftdown){ y=nYchar*1; TextOut(hDC,x,y,textbuf1,lstrlen(textbuf1)); nshiftdown=false; } else if(nctrldown){ y=nYchar*2; TextOut(hDC,x,y,textbuf2,lstrlen(textbuf2)); nctrldown=false; } else if(nshiftbdown){ y=nYchar*3; TextOut(hDC,x,y,textbuf3,lstrlen(textbuf3)); nshiftbdown=false; } else if(nctrladown){ y=nYchar*4; TextOut(hDC,x,y,textbuf4,lstrlen(textbuf4)); nctrladown=false; } DeleteObject(hPen); DeleteObject(hBrush); EndPaint(hwnd,&PtStr); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; default: return DefWindowProc(hwnd,message,wParam,lParam); } return 0; }