c/C++ 【Win32】 建立一個 Button

  建立一個 Button HWND  hwndButton hwndButton = CreateWindow(

    " BUTTON",   // predefined class    不區分大小寫

    "OK",       // button text

     WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  // styles     注意 如果樣式寫錯了 Button 将不會正常顯示

    // Size and position values are given explicitly, because

    // the CW_USEDEFAULT constant gives zero values for buttons.

    10,         // starting x position

    10,         // starting y position

    100,        // button width

    100,        // button height

    hwnd,       // parent window

    NULL,       // No menu

    (HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),

    NULL);      // pointer not needed ================================================ #include <windows.h>

//expected constructor, destructor, or type conversion before

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

LRESULT CALLBACK WndProc(HWND hWnd, UINT message,WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow){

static TCHAR szAppName[] = TEXT("hello");

HWND hwnd;

MSG msg;

WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;

wndclass.lpfnWndProc = WndProc;

wndclass.cbClsExtra = 0;

wndclass.cbWndExtra = 0;

wndclass.hInstance = hInstance;

// 加載 圖示供程式使用 IDI-圖示ID

wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);

// 加載 滑鼠光标供程式使用 IDC-遊标ID

wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);

//GetStockObject 取得一個圖形對象(此例中是取得視窗背景的畫刷對象)

wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

wndclass.lpszMenuName = NULL;

wndclass.lpszClassName = szAppName;

// 視窗依照某一視窗類别建立，視窗類别用以辨別處理視窗消息的視窗消息處理程式。

// 注冊視窗

if(!RegisterClass(&wndclass)){

MessageBox(NULL, TEXT("This program requires Windows NT!"),

szAppName,MB_ICONERROR);

return 0;

}

// 根據視窗類别 WndClass 建立一個視窗

hwnd = CreateWindow(szAppName, // window class name

TEXT("Hello world"), // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

NULL, // parent window handle

NULL, // window menu handle

hInstance,//program instance handle

NULL); // creation parameters

// 在螢幕上顯示視窗

ShowWindow(hwnd,iCmdShow);

// 訓示視窗自我更新

UpdateWindow(hwnd);

// 從消息隊列中取得消息

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

TranslateMessage(&msg);

DispatchMessage(&msg);

}

return msg.wParam;

}

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

{

HWND hwndButton;

HDC hdc ;

PAINTSTRUCT ps ;

RECT rect ;

char* str;

switch (message)

{

case WM_CREATE:

//PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;

// 建立一個按鈕

hwndButton = CreateWindow(

"BUTTON", // predefined class

"OK", // button text

WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, // styles

// Size and position values are given explicitly, because

// the CW_USEDEFAULT constant gives zero values for buttons.

10, // starting x position

10, // starting y position

100, // button width

100, // button height

hwnd, // parent window

NULL, // No menu

(HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),

NULL); // pointer not needed

//MoveWindow(hwndSmaller, 100,100, 100, 100, TRUE) ;

return 0 ;

case WM_PAINT:

// 繪制視窗

hdc = BeginPaint (hwnd, &ps) ;

// 取得視窗顯示區域的大小

GetClientRect (hwnd, &rect) ;

str = "hello world!!!";

// 顯示字元串

// DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect,

// DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;

// 輸出字元串

TextOut(hdc,20,20, str,strlen(str));

EndPaint (hwnd, &ps) ;

return 0 ;

case WM_DESTROY:

// 再消息隊列中插入一個[退出程式]消息

PostQuitMessage (0) ;

return 0 ;

}

// 執行内定的消息處理

return DefWindowProc (hwnd, message, wParam, lParam) ;

}