1.不规则窗口
原理：用一个位图画刷绘制窗口背景，然后把想要透明的颜色设置为透明色，就可以使窗口变成任意形状。
1 //窗口处理函数 2 LRESULT CALLBACK BitmapWindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 3 { 4 static HDC s_hdcMem; 5 static HBRUSH s_hBackBrush; 6 COLORREF clTransparent;//透明色 7 switch (message) 8 { 9 case WM_CREATE: 10 SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);//设置分层属性 11 clTransparent = RGB(0, 0, 0); 12 //将黑色设置为完全透明，0表示完全透明 13 SetLayeredWindowAttributes(hWnd, clTransparent, 0, LWA_COLORKEY); 14 return 0; 15 case WM_KEYDOWN: 16 //按下Esc键时退出 17 if (VK_ESCAPE == wParam) 18 { 19 SendMessage(hWnd, WM_DESTROY, 0, 0); 20 return 0; 21 } 22 break; 23 case WM_LBUTTONDOWN: 24 //当鼠标左键点击时可以拖曳窗口 25 PostMessage(hWnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0); 26 return 0; 27 case WM_DESTROY: 28 PostQuitMessage(0); 29 return 0; 30 } 31 return DefWindowProc(hWnd, message, wParam, lParam); 32 } 33 34 //初始化为位图窗口（注册窗口类、创建窗口、显示窗口） 35 BOOL InitBitmapWindow(HINSTANCE hInstance, HBITMAP hBitmap, int nCmdShow) 36 { 37 //注册窗口类 38 WNDCLASS wndclass; 39 wndclass.cbClsExtra = 0; 40 wndclass.cbWndExtra = 0; 41 wndclass.hbrBackground = CreatePatternBrush(hBitmap); 42 wndclass.hCursor = NULL; 43 wndclass.hIcon = NULL; 44 wndclass.lpfnWndProc = BitmapWindowProc; 45 wndclass.lpszClassName = L"Hello"; 46 wndclass.lpszMenuName = NULL; 47 wndclass.hInstance = hInstance; 48 wndclass.style = CS_HREDRAW | CS_VREDRAW; 49 if (!RegisterClass(&wndclass)) 50 { 51 MessageBox(NULL, L"Program Need Windows NT", L"Error", MB_ICONERROR); 52 return FALSE; 53 } 54 BITMAP bmp; 55 GetObject(hBitmap, sizeof(bmp), &bmp); 56 //创建窗口 57 HWND hWnd = CreateWindowEx(WS_EX_TOPMOST, L"Hello", L"HelloKitty", WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT, 58 bmp.bmWidth, bmp.bmHeight, NULL, NULL, hInstance, NULL); 59 if (NULL == hWnd) 60 { 61 return FALSE; 62 } 63 //显示窗口 64 ShowWindow(hWnd, nCmdShow); 65 UpdateWindow(hWnd); 66 return TRUE; 67 } 68 69 int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) 70 { 71 HBITMAP hBitmap = (HBITMAP)LoadImage(NULL, L"kitty.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); 72 if (NULL == hBitmap) 73 { 74 MessageBox(NULL, L"加载位图失败", L"Error", MB_ICONERROR); 75 return -1; 76 } 77 if (!InitBitmapWindow(hInstance, hBitmap, nCmdShow)) 78 { 79 return -1; 80 } 81 MSG msg; 82 while (GetMessage(&msg, NULL, 0, 0)) 83 { 84 TranslateMessage(&msg); 85 DispatchMessage(&msg); 86 } 87 DeleteObject(hBitmap); 88 return 0; 89 }
运行效果：
