VC6下验证父窗口和子窗口的消息传递过程-C语言API方式

#include <windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK WndProcChild(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT("HelloWin"); static char szAppNameChild[] = TEXT("HelloWinChild"); HWND hwnd; HWND hwndChild; MSG msg; WNDCLASS wndclass; WNDCLASS wndclassChild; wndclass.style = CS_HREDRAW | CS_VREDRAW; 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 = szAppName; if(!RegisterClass(&wndclass)) { MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR); return 0; } hwnd = CreateWindow(szAppName, TEXT("The hellow program father"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); //创建子窗口 wndclassChild.style = CS_HREDRAW | CS_VREDRAW; wndclassChild.lpfnWndProc = WndProcChild; wndclassChild.cbClsExtra = 0; wndclassChild.cbWndExtra = 0; wndclassChild.hInstance = hInstance; wndclassChild.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclassChild.hCursor = LoadCursor(NULL, IDC_ARROW); wndclassChild.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclassChild.lpszMenuName = NULL; wndclassChild.lpszClassName = szAppNameChild; if(!RegisterClass(&wndclassChild)) { MessageBox(NULL, TEXT("This program requires windows NT!"), szAppNameChild, MB_ICONERROR); return 0; } hwndChild = CreateWindow(szAppNameChild, TEXT("The hellow program Child"), WS_OVERLAPPEDWINDOW | WS_CHILD, CW_USEDEFAULT, CW_USEDEFAULT, 300, 200, hwnd, NULL, hInstance, NULL); ShowWindow(hwndChild, iCmdShow); UpdateWindow(hwndChild); //子窗口创建结束 while(GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg);//将按键消息转换为字符消息，这样WM_CHAR中可以获得输入的键盘字符 DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; RECT rect; CHAR chCharCode; switch(message) { case WM_CREATE: return 0; case WM_LBUTTONDOWN: MessageBox(NULL, TEXT("这是父窗口，左键按下!"), "父窗口", MB_OKCANCEL); return 0; case WM_RBUTTONDOWN: MessageBox(NULL, TEXT("这是父窗口，右键按下!"), "父窗口", MB_OKCANCEL); return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rect); DrawText(hdc, TEXT("Hello, 这是父窗口!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); EndPaint(hwnd, &ps); return 0; case WM_CHAR: chCharCode = (TCHAR) wParam; return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); } LRESULT CALLBACK WndProcChild(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; RECT rect; switch(message) { case WM_CREATE: return 0; case WM_LBUTTONDOWN: MessageBox(NULL, TEXT("这是子窗口，左键按下!"), "子窗口", MB_OKCANCEL); case WM_PAINT: hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rect); DrawText(hdc, TEXT("Hello, 这是子窗口!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }