//呼叫api函式建立視窗

//示例:

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//視窗過程函式

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName[] = TEXT("MyWindows");//定義視窗類名

HWND hwnd;//視窗控制代碼

MSG msg; //

WNDCLASS wndclass; //視窗類

wndclass.style = CS_HREDRAW | CS_VREDRAW;//指定視窗型別，各種“類風格”（詳見下方↓）可以使用按位或運算子組合起來

wndclass.lpfnWndProc = WndProc;//指定視窗過程（必須是回撥函式）

wndclass.cbClsExtra = 0;//預留的額外空間，一般為 0

wndclass.cbWndExtra = 0;//預留的額外空間，一般為 0

wndclass.hInstance = hInstance;//應用程式的例項控制代碼

wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);//為所有基於該視窗類的視窗設定一個圖示

wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);//為所有基於該視窗類的視窗設定一個滑鼠指標

wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);//指定視窗背景色

wndclass.lpszMenuName = NULL;//指定視窗選單

wndclass.lpszClassName = szAppName;//指定視窗類名

if (!RegisterClass(&wndclass))//註冊視窗

{

MessageBox(NULL, TEXT("這個程式需要在 Windows NT 才能執行！"), szAppName, MB_ICONERROR);

return 0;

}

hwnd = CreateWindow(szAppName, //建立視窗

TEXT("windows"),

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

NULL,

NULL,

hInstance,

NULL);

ShowWindow(hwnd, iCmdShow); //顯示視窗

UpdateWindow(hwnd); //更新視窗,重繪

while (GetMessage(&msg, NULL, 0, 0)) //獲得訊息

{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)//回撥函式

{

HDC hdc;

PAINTSTRUCT ps;

RECT rect;

switch (message)

{

case WM_PAINT:

hdc = BeginPaint(hwnd, &ps);

GetClientRect(hwnd, &rect);

DrawText(hdc, TEXT("第一個C語言視窗程式！"), -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);

}