C / C++ / MFC

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#include<windows.h><br />
#include<tchar.h><br />
<br />
#define IDC_SUPERCLASS1 1<br />
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static HWND hsuperedit1;<br />
<br />
WNDPROC g_editwndOrg;<br />
static LPCTSTR sz_editsuperclass=TEXT("SuperclassEdit");<br />
<br />
LRESULT WINAPI EditSuperclassWndProc(HWND hedit,UINT msg,WPARAM wParam,LPARAM lParam);<br />
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LRESULT WINAPI WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)<br />
{<br />
	int cx,cy;<br />
	switch(msg)<br />
	{<br />
	case WM_CREATE:<br />
                  hsuperedit1=CreateWindow(sz_editsuperclass,NULL,ES_AUTOHSCROLL|ES_LEFT|ES_MULTILINE|WS_CHILD|WS_VISIBLE,100,200,300,400,hwnd,(HMENU)IDC_SUPERCLASS1,HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);<br />
		return 0;<br />
	case WM_DESTROY:<br />
		PostQuitMessage(0);<br />
		return 0;<br />
	}<br />
	return DefWindowProc(hwnd,msg,wParam,lParam);<br />
}<br />
<br />
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE,LPSTR lpCmdLine,int nShowCmd)<br />
{<br />
	static LPCSTR szClassName="Show Time";<br />
	WNDCLASSEX wc_edit;<br />
	WNDCLASSEX wc;<br />
<br />
	ZeroMemory(&wc,sizeof(wc));<br />
	wc.cbClsExtra =0;<br />
	wc.cbSize =sizeof(WNDCLASSEX);<br />
	wc.cbWndExtra =sizeof(LONG);<br />
	wc.hbrBackground =(HBRUSH) GetStockObject (COLOR_BACKGROUND) ;<br />
	wc.hCursor =LoadCursor (NULL, IDC_ARROW);<br />
	wc.hIcon =NULL;<br />
	wc.hIconSm =NULL;<br />
	wc.hInstance =hInstance;<br />
	wc.lpfnWndProc =WndProc;<br />
	wc.lpszClassName =szClassName;<br />
	wc.lpszMenuName =NULL;<br />
	wc.style =CS_HREDRAW|CS_VREDRAW;<br />
<br />
	ATOM atomclass=RegisterClassEx(&wc);<br />
	if(atomclass==INVALID_ATOM)<br />
	{<br />
		MessageBox(NULL,"RegisterClass Error","RegisterClass Error",MB_OK);<br />
		exit(1);<br />
	}<br />
<br />
	HWND hwnd=CreateWindowEx(NULL,szClassName,0,WS_OVERLAPPEDWINDOW,<br />
		0,0,500,650,NULL,NULL,hInstance,NULL);<br />
<br />
	ZeroMemory(&wc_edit,sizeof(wc_edit));<br />
	GetClassInfoEx(NULL,"edit",&wc_edit);<br />
	g_editwndOrg=wc_edit.lpfnWndProc;<br />
	wc_edit.lpszClassName =sz_editsuperclass;<br />
	wc_edit.hInstance =hInstance;<br />
	wc_edit.lpfnWndProc =EditSuperclassWndProc;<br />
	wc_edit.cbSize =sizeof(WNDCLASSEX);<br />
<br />
	ATOM atomclass_edit=RegisterClassEx(&wc_edit);<br />
	if(atomclass_edit==INVALID_ATOM)<br />
	{<br />
		MessageBox(NULL,"RegisterSuperClass Error","RegisterSuperClass Error",MB_OK);<br />
		exit(1);<br />
	}<br />
<br />
	ShowWindow(hwnd,SW_SHOW);	<br />
	UpdateWindow(hwnd);<br />
//      if the createwindow was moved from wm_create to <br />
//	here(in WinMain()),the editbox can be showed out.<br />
//	hsuperedit1=CreateWindow(sz_editsuperclass,NULL,ES_AUTOHSCROLL|ES_LEFT|ES_MULTILINE|WS_CHILD|WS_VISIBLE,0,0,100,200,hwnd,(HMENU)IDC_SUPERCLASS1,(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE) ,NULL);<br />
<br />
<br />
	MSG msg;<br />
	while(GetMessage(&msg,NULL,NULL,NULL))<br />
	{<br />
		TranslateMessage(&msg);<br />
		DispatchMessage(&msg);<br />
	}<br />
	return msg.wParam ;<br />
}<br />
<br />
LRESULT WINAPI EditSuperclassWndProc(HWND hedit,UINT msg,WPARAM wParam,LPARAM lParam)<br />
{<br />
	LRESULT lResult;<br />
	BOOL fCallOrgProc=TRUE;<br />
	switch(msg)<br />
	{<br />
	case WM_CHAR:<br />
		if(wParam=='a')<br />
		{<br />
			fCallOrgProc=FALSE;<br />
		}<br />
		break;<br />
	}<br />
	if(fCallOrgProc)<br />
	{<br />
		lResult=CallWindowProc(g_editwndOrg,hedit,msg,wParam,lParam);<br />
	}<br />
	return lResult;<br />
}<br />
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