windows窗体初始代码注释
WinMain
HELLOWIN.C
/*
------------------------------------------------------------------------
HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
(c) Charles Petzold, 1998
-----------------------------------------------------------------------
*/
#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 ;
WNDCLASS wndclass ;
wndclass.style
=
CS_HREDRAW
|
CS_VREDRAW ;
//
使用或运算结合了两个窗口类别样式标识符， CS_HREDROW 是水平方向 ,CS_VredRow是垂直方向
wndclass.lpfnWndProc
=
WndProc ;
//
窗口消息处理程序的地址
///////////////
预留额外空间
///////////////
/
wndclass.cbClsExtra
=
0
;
wndclass.cbWndExtra
=
0
;
////////////////////////////////////
/
wndclass.hInstance
=
hInstance ;
//
程序执行实体句柄
wndclass.hIcon
=
LoadIcon (NULL, IDI_APPLICATION) ;
//
设置一个图标
wndclass.hCursor
=
LoadCursor (NULL, IDC_ARROW) ;
//
设置光标
wndclass.hbrBackground
=
(HBRUSH) GetStockObject (WHITE_BRUSH) ;
//
设置背景色
wndclass.lpszMenuNam
=
NULL ;
//
窗口类别菜单
wndclass.lpszClassName
=
szAppName ;
//
窗口消息处理程序的名称
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 左上角x
CW_USEDEFAULT,
//
initial y position 左上角y
CW_USEDEFAULT,
//
initial x size 宽度
CW_USEDEFAULT,
//
initial y size 高度
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) ;
//
翻译消息
DispatchMessage (
&
msg) ;
//
传送消息
}
return
msg.wParam ;
}
//
以下是窗口消息处理程序
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
//
包含一些窗口消息处理程式序，可以用来更新显示区域的内容。
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) ;
}