“HELLOWIN程式”的意思、由来-中文百科全书

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HELLOWIN程式

释义

§ 介绍

建立一个视窗首先需要注册一个视窗类别，那需要一个视窗讯息处理程式来处理视窗讯息。处理视窗讯息对每个Windows程式都带来了些负担。程式3-1所示的HELLOWIN程式中整个做的事情差不多就是料理这些事情。

§ 说明

程式3-1　HELLOWIN

HELLOWIN.C

/*------------------------------------------------------------------------

HELLOWIN.C -- Displays "Hello, Windows 98!" in client area

-----------------------------------------------------------------------*/

#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName【】 = TEXT ("HelloWin") ;

HWND hwnd ;

MSG msg ;

WNDCLAS wndclass ;

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.lpszMenuNam = NULL ;

wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))

{

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

szAppName, MB_ICONERROR) ;

return 0 ;

}

hwnd = CreateWindow( szAppName, // window class name

TEXT ("The Hello Program"), // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT, // initial x position

CW_USEDEFAULT, // initial y position

CW_USEDEFAULT, // initial x size

CW_USEDEFAULT, // initial y size

NULL, // parent window handle

NULL, 　　　 // window menu handle

hInstance, 　　 // program instance handle

NULL) ; 　　 // creation parameters

ShowWindow (hwnd, iCmdShow) ;

UpdateWindow (hwnd) ;

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

{

TranslateMessage (&msg) ;

DispatchMessage (&msg) ;

}

return msg.wParam ;

}

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

{

HDC hdc ;

PAINTSTRUCT ps ;

RECT rect ;

switch (message)

{

case WM_CREATE:

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

return 0 ;

case WM_PAINT:

hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rect) ;

DrawText (hdc, TEXT ("Hello, Windows 98!"), -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) ;

}

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