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视窗和讯息(三)
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将疑，就让我们去看看在实际的程式中，视窗、视窗类别、视窗讯息处理程式、讯息伫列、讯息回圈和视窗讯息是如何相互配合的。这或许会对您有些帮助。
HELLOWIN程式
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。
程式3-1 HELLOWIN
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 ;
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.lpszMenu |
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