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初学windows编程：想把一个主窗体的客户区分割成三个部分，下面是代码，运行起来却仍是空白的没什么变化，这是为何？求大神指点 #include <windows.h> #define ID_FIRSTCHILD 100 #define ID_SECONDCHILD 101 #define ID_THIRDCHILD 102 // Global variable HINSTANCE hinst; // Function prototypes. int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int); InitApplication(HINSTANCE); InitInstance(HINSTANCE, int); LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM); BOOL CALLBACK EnumChildProc(HWND , LPARAM ) ; // Application entry point. int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; if (!InitApplication(hinstance)) return FALSE; if (!InitInstance(hinstance, nCmdShow)) return FALSE; while (GetMessage(&msg, (HWND) NULL, 0, 0) != 0 && GetMessage(&msg, (HWND) NULL, 0, 0) != -1) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; UNREFERENCED_PARAMETER(lpCmdLine); } BOOL InitApplication(HINSTANCE hinstance) { WNDCLASSEX wcx; // Fill in the window class structure with parameters // that describe the main window. wcx.cbSize = sizeof(wcx); // size of structure wcx.style = CS_HREDRAW | CS_VREDRAW; // redraw if size changes wcx.lpfnWndProc = MainWndProc; // points to window procedure wcx.cbClsExtra = 0; // no extra class memory wcx.cbWndExtra = 0; // no extra window memory wcx.hInstance = hinstance; // handle to instance wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION); // predefined app. icon wcx.hCursor = LoadCursor(NULL, IDC_ARROW); // predefined arrow wcx.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH); // white background brush wcx.lpszMenuName = "MainMenu"; // name of menu resource wcx.lpszClassName = "MainWClass"; // name of window class wcx.hIconSm = NULL; // Register the window class. return RegisterClassEx(&wcx); } BOOL InitInstance(HINSTANCE hinstance, int nCmdShow) { HWND hwnd; // Save the application-instance handle. hinst = hinstance; // Create the main window. hwnd = CreateWindow( "MainWClass", // name of window class "Sample", // title-bar string WS_OVERLAPPEDWINDOW, // top-level window CW_USEDEFAULT, // default horizontal position CW_USEDEFAULT, // default vertical position CW_USEDEFAULT, // default width CW_USEDEFAULT, // default height (HWND) NULL, // no owner window (HMENU) NULL, // use class menu hinstance, // handle to application instance (LPVOID) NULL); // no window-creation data if (!hwnd) return FALSE; // Show the window and send a WM_PAINT message to the window // procedure. ShowWindow(hwnd, nCmdShow); UpdateWindow(hwnd); return TRUE; } LONG APIENTRY MainWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { RECT rcClient; int i; switch(uMsg) { case WM_CREATE: // creating main window // Create three invisible child windows. for (i = 0; i < 3; i++) { CreateWindowEx( 0, "ChildWClass", (LPCTSTR) NULL, WS_CHILD | WS_BORDER, 0,0,0,0, hwnd, (HMENU) (int) (ID_FIRSTCHILD + i), hinst, NULL); } return 0; case WM_SIZE: // main window changed size // Get the dimensions of the main window's client // area, and enumerate the child windows. Pass the // dimensions to the child windows during enumeration. GetClientRect(hwnd, &rcClient); EnumChildWindows(hwnd, EnumChildProc, (LPARAM) &rcClient); return 0; // Process other messages. } return DefWindowProc(hwnd, uMsg, wParam, lParam); } BOOL CALLBACK EnumChildProc(HWND hwndChild, LPARAM lParam) { LPRECT rcParent; int i, idChild; // Retrieve the child-window identifier. Use it to set the // position of the child window. idChild = GetWindowLong(hwndChild, GWL_ID); if (idChild == ID_FIRSTCHILD) i = 0; else if (idChild == ID_SECONDCHILD) i = 1; else i = 2; // Size and position the child window. rcParent = (LPRECT) lParam; MoveWindow(hwndChild, (rcParent->right / 3) * i, 0, rcParent->right / 3, rcParent->bottom, TRUE); // Make sure the child window is visible. ShowWindow(hwndChild, SW_SHOW); return TRUE; } |
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