C++开发截屏小程序功能

ATOM MyRegisterClass(HINSTANCE hInstance)
{
 WNDCLASSEX wcex;
 
 wcex.cbSize = sizeof(WNDCLASSEX);
 wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
 wcex.lpfnWndProc = WndProc;
 wcex.cbClsExtra = 0;
 wcex.cbWndExtra = 0;
 wcex.hInstance = hInstance;
 wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDC_CAPTURESCREEN));
 wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
 wcex.hbrBackground = (HBRUSH)(BLACK_BRUSH);
 wcex.lpszMenuName = NULL;
 wcex.lpszClassName = szWindowClass;
 wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

 return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{

 hInst = hInstance; // 将实例句柄存储在全局变量中
 //创建自己的窗口
 hWnd = CreateWindow(szWindowClass, szTitle, WS_POPUP,
 CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

 if (!hWnd)
 {
 return FALSE;
 }
 //显示和更新窗口
 ShowWindow(hWnd, SW_MAXIMIZE);
 UpdateWindow(hWnd);

 return TRUE;
}

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
 _In_opt_ HINSTANCE hPrevInstance,
 _In_ LPTSTR lpCmdLine,
 _In_ int  nCmdShow)
{
 //playsound只能播放wav格式，而mcisendstring可以播放任意格式的。
 
 //PlaySound("yixi.wav", NULL, SND_FILENAME | SND_ASYNC | SND_LOOP);
 mciSendString("open ./abc.mp3 alias bk",
 0, 0, 0);
 mciSendString("play bk repeat", 0, 0, 0);

 UNREFERENCED_PARAMETER(hPrevInstance);
 UNREFERENCED_PARAMETER(lpCmdLine);

 // TODO: 在此放置代码。
 MSG msg;
 HACCEL hAccelTable;

 // 初始化全局字符串
 LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
 LoadString(hInstance, IDC_CAPTURESCREEN, szWindowClass, MAX_LOADSTRING);
 
 MyRegisterClass(hInstance); //注册类

 // 执行应用程序初始化: 
 if (!InitInstance(hInstance, nCmdShow)) //初始化窗口
 {

 return FALSE;
 }

 hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_CAPTURESCREEN));

 // 主消息循环: 
 while (GetMessage(&msg, NULL, 0, 0))
 {
 if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
 {
 TranslateMessage(&msg);
 DispatchMessage(&msg);
 }
 }
 return (int)msg.wParam;
}

void ScreenDisplay()
{
 HDC disDc = ::CreateDC("DISPLAY", NULL, NULL, NULL);
 g_memDC = ::CreateCompatibleDC(disDc);
 g_ScreenW = GetDeviceCaps(disDc, HORZRES);
 g_ScreenH = GetDeviceCaps(disDc, VERTRES);
 HBITMAP hbitmap = CreateCompatibleBitmap(disDc, g_ScreenW, g_ScreenH);
 SelectObject(g_memDC, hbitmap);
 BitBlt(g_memDC, 0, 0, g_ScreenW, g_ScreenH, disDc, 0, 0, SRCCOPY);
}

case WM_PAINT:
 hdc = BeginPaint(hWnd, &ps);
 // TODO: 在此添加任意绘图代码...
 SelectObject(hdc, hpen);
 SelectObject(hdc, hBrush);
 BitBlt(hdc, 0, 0, g_ScreenW, g_ScreenH, g_memDC, 0, 0, SRCCOPY);
 Rectangle(hdc, rect.left, rect.top, rect.right, rect.bottom);
 EndPaint(hWnd, &ps);
break;

case WM_LBUTTONDOWN:
{
  if (!Iselect)
  {
   POINT pt;
   GetCursorPos(&pt);
   rect.left = pt.x;
   rect.top = pt.y;
   rect.right = pt.x;
   rect.bottom = pt.x;
   InvalidateRgn(hWnd, 0, FALSE);
   Isdowmn = TRUE;
  }


}
 break;
case WM_LBUTTONUP:
{
  if (Isdowmn == TRUE&&!Iselect)
  {
  POINT pt;
  GetCursorPos(&pt);
  rect.right = pt.x;
  rect.bottom = pt.y;
  InvalidateRgn(hWnd, 0, FALSE);
  Isdowmn = FALSE;
  Iselect = TRUE;
  }
}
 break;
case WM_MOUSEMOVE:
{
  if (Isdowmn == TRUE&&!Iselect)
  {
  POINT pt;
  GetCursorPos(&pt);
  rect.right = pt.x;
  rect.bottom = pt.y;
  InvalidateRgn(hWnd, 0, FALSE);
  }
}
 break;

case WM_LBUTTONDBLCLK:
 if (Iselect == TRUE)
 {
 int iNum = MessageBox(hWnd, "截图成功！", "张一西", MB_OKCANCEL | MB_ICONINFORMATION);
 if (iNum == 1)
 {
  CopyToCliboard();
  Iselect = FALSE;
  PostQuitMessage(0);
 }
 else
 {
  Iselect = FALSE;
 }
 }
 break;

void CopyToCliboard()
{
 HDC hScreenDC = ::CreateDC("DISPLAY", 0, 0, 0);
 HDC memDC = ::CreateCompatibleDC(hScreenDC);
 int Width = rect.right - rect.left-2;
 int Height = rect.bottom - rect.top-2;
 HBITMAP hBmap = CreateCompatibleBitmap(hScreenDC, Width, Height);
 HBITMAP hOldBmap = (HBITMAP)SelectObject(memDC, hBmap);
 BitBlt(memDC, 0, 0, Width, Height, hScreenDC, rect.left+1, rect.top+1, SRCCOPY);
 HBITMAP hNewBmap = (HBITMAP)SelectObject(memDC, hOldBmap);
 if (OpenClipboard(0))      //打开粘贴板
 {
 EmptyClipboard();      //清空粘贴板
 SetClipboardData(CF_BITMAP, hNewBmap); //把图片放入粘贴板
 CloseClipboard();      //关闭粘贴板
 }
}