Win32 API样例

空窗口

#ifndef UNICODE
#define UNICODE
#endif 

#include <windows.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
   // Register the window class.
   const wchar_t CLASS_NAME[] = L"Sample Window Class";

   WNDCLASS wc = { };

   wc.lpfnWndProc = WindowProc;
   wc.hInstance = hInstance;
   wc.lpszClassName = CLASS_NAME;

   RegisterClass(&wc);

   // Create the window.

   HWND hwnd = CreateWindowEx(
      0,                              // Optional window styles.
      CLASS_NAME,                     // Window class
      L"Learn to Program Windows",    // Window text
      WS_OVERLAPPEDWINDOW,            // Window style

      // Size and position
      CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

      NULL,       // Parent window    
      NULL,       // Menu
      hInstance,  // Instance handle
      NULL        // Additional application data
   );

   if (hwnd == NULL)
   {
      return 0;
   }

   ShowWindow(hwnd, nCmdShow);

   // Run the message loop.

   MSG msg = { };
   while (GetMessage(&msg, NULL, 0, 0))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }

   return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
   switch (uMsg)
   {
   case WM_DESTROY:
      PostQuitMessage(0);
      return 0;

   case WM_PAINT:
   {
      PAINTSTRUCT ps;
      HDC hdc = BeginPaint(hwnd, &ps);



      FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));

      EndPaint(hwnd, &ps);
   }
   return 0;

   }
   return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

按钮，子窗口

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

#define ID_BEEP 1
#define ID_QUIT 2
#define ID_MYTEST 3
#define ID_MYTEST2 4
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
   PWSTR lpCmdLine, int nCmdShow) {

   MSG  msg;
   WNDCLASSW wc = { 0 };
   wc.lpszClassName = L"Buttons";
   wc.hInstance = hInstance;
   wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
   wc.lpfnWndProc = WndProc;
   wc.hCursor = LoadCursor(0, IDC_ARROW);

   RegisterClassW(&wc);
   CreateWindowW(wc.lpszClassName, L"Buttons",
      WS_OVERLAPPEDWINDOW | WS_VISIBLE,
      150, 150, 500, 500, 0, 0, hInstance, 0);

   while (GetMessage(&msg, NULL, 0, 0)) {

      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }

   return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
   WPARAM wParam, LPARAM lParam) {

   switch (msg) {

   case WM_CREATE:

      CreateWindowW(L"Button", L"Beep",
         WS_VISIBLE | WS_CHILD,
         20, 50, 80, 25, hwnd, (HMENU)ID_BEEP, NULL, NULL);

      CreateWindowW(L"Button", L"Quit",
         WS_VISIBLE | WS_CHILD,
         120, 50, 80, 25, hwnd, (HMENU)ID_QUIT, NULL, NULL);

      CreateWindowW(L"Button", L"MyTest",
         WS_VISIBLE | WS_CHILD,
         220, 50, 80, 25, hwnd, (HMENU)ID_MYTEST, NULL, NULL);
      break;
   case WM_COMMAND:

      if (LOWORD(wParam) == ID_BEEP) {

         MessageBeep(MB_OK);
      }

      if (LOWORD(wParam) == ID_QUIT) {

         PostQuitMessage(0);
      }

      if (LOWORD(wParam) == ID_MYTEST) {

         CreateWindowW(L"Buttons", L"子窗口",
            WS_OVERLAPPEDWINDOW | WS_CHILD | WS_VISIBLE | WS_POPUP,
            300, 50, 400, 200,
            NULL, NULL, NULL, NULL);

      }

      break;

   case WM_DESTROY:

      PostQuitMessage(0);
      break;
   }

   return DefWindowProcW(hwnd, msg, wParam, lParam);
}