#ifndef UNICODE #define UNICODE#endif#include <windows.h>HWND mainframe;LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);HWND CreateButton(LPCTSTR name, int x, int y, int w, int h, HWND parent);int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){ MSG msg; // MSG structure to store messages WNDCLASSEX wcx; // WINDOW class information HWND button, hOKButton; // Initialize the struct to zero ZeroMemory(&wcx,sizeof(WNDCLASSEX)); wcx.cbSize = sizeof(WNDCLASSEX); // Window size. Must always be sizeof(WNDCLASSEX) wcx.style = CS_HREDRAW|CS_VREDRAW |CS_DBLCLKS ; // Class styles wcx.lpfnWndProc = (WNDPROC)MainWndProc; // Pointer to the callback procedure wcx.cbClsExtra = 0; // Extra byte to allocate following the wndclassex structure wcx.cbWndExtra = 0; // Extra byte to allocate following an instance of the structure wcx.hInstance = hInst; // Instance of the application wcx.hIcon = NULL; // Class Icon wcx.hCursor = LoadCursor(NULL, IDC_ARROW); // Class Cursor wcx.hbrBackground = (HBRUSH)(COLOR_WINDOW); // Background brush wcx.lpszMenuName = NULL; // Menu resource wcx.lpszClassName = TEXT("Lesson2"); // Name of this class wcx.hIconSm = NULL; // Small icon for this class// Register this window class with MS-Windows if (!RegisterClassEx(&wcx)) return 0; mainframe = CreateWindowEx(0, //Extended window style TEXT("Lesson2"), // Window class name TEXT("Whatever"), // Window title WS_OVERLAPPEDWINDOW, // Window style CW_USEDEFAULT,CW_USEDEFAULT, // (x,y) pos of the window CW_USEDEFAULT,CW_USEDEFAULT, // Width and height of the window HWND_DESKTOP, // HWND of the parent window (can be null also) NULL, // Handle to menu hInst, // Handle to application instance NULL); // Pointer to window creation data if (mainframe) { printf("no"); } button = CreateButton("Test", 1, 1, 500, 500, mainframe); ShowWindow(mainframe, nCmdShow); UpdateWindow(mainframe); while (GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam;}LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam){ switch (msg) { case WM_DESTROY: PostQuitMessage(0); break; default: // Call the default window handler return DefWindowProc(hwnd,msg,wParam,lParam); } return 0;}HWND CreateButton(LPCTSTR name, int x, int y, int w, int h, HWND parent){ return CreateWindow("BUTTON", name, WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, x, y, w, h, parent, NULL, (HINSTANCE)GetWindowLong(parent, GWL_HINSTANCE), NULL);}