API 线程不能关闭

[qixueqi]

不好意思：
初次学API，出了个问题，我新建一个Dialog作为主界面，在循环消息处理中以DestroyWindow(hWnd);DestroyWindow(GetParent(hWnd)); 来退出程序，但是每次退出后，我的任务管理器中照样存在线程。现在我把代码贴出来，请高手指点！



代码：
// Test002.cpp : Defines the entry point for the application.
//
#include <stdafx.h>
#include "resource.h"
#include "Login.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text

// Foward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL DialogRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK DlgProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;

// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_TEST002, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
//DialogRegisterClass(hInstance)
HWND hWnd_Main;
//(WNDPROC)WndProc Param ,0L (DLGPROC) (DLGPROC)DlgProc
hWnd_Main = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_LOGIN),NULL,(DLGPROC)DlgProc);

ShowWindow(hWnd_Main, nCmdShow);
UpdateWindow(hWnd_Main);
hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_TEST002);

// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage is only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);
//(WNDPROC)WndProc
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_TEST002);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_TEST002;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = NULL;

return RegisterClassEx(&wcex);
}

//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

switch (message)
{
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
DestroyWindow(hWnd);
return TRUE;
}
break;
default:
return DlgProc(hWnd,message,wParam,lParam);
}
return false;
}


LRESULT CALLBACK DlgProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
//int wmId, wmEvent;
switch (message)
{
case WM_INITDIALOG :
return TRUE ; //

case WM_COMMAND :
switch (LOWORD (wParam))
{
case IDOK :
case IDCANCEL :
DestroyWindow(hWnd);
DestroyWindow(GetParent(hWnd));
EndDialog(hWnd, 0) ; //
break ; //
}
case WM_CLOSE:
DestroyWindow(hWnd);
DestroyWindow(GetParent(hWnd)); ;
break;
}
return FALSE ; //
}

[Yofoo]

DestroyWindow(GetParent(hWnd)); 这个什么意思??

用EndDialog 可以退出

[ringphone]

非模态对话框是需要用DestroyWindow退出的，这个没错。
但是这个DestroyWindow(GetParent(hWnd)); 是销毁对话框的父窗口，这个对话框的父窗口可是桌面，不过GetParent(hWnd)返回是NULL，DestroyWindow(NULL)没什么影响。

之所以程序没退出是没有PostQiutMessage，WinMain里面的while (GetMessage(&msg, NULL, 0, 0)) 等不到WM_QUIT消息，一直在那等着，所以程序没办法结束。
需要在WM_DESTROY消息里面调用一下PostQiutMessage(0);

[qixueqi]

开始用EndDialog(hWnd, 0) ;他退出
后来在任务管理中还是有进程存在
我加了DestroyWindow(hWnd); 来销毁句柄
可是还是不行
我以为父类句柄存在
就用DestroyWindow(GetParent(hWnd));
所以就把父类句柄删掉
可还是不行

[qixueqi]

ringphone(临风) ：多谢！
已经搞定了
本人刚学API，不知可不可以交个朋友！以方便请教!
skype：qixueqi
E-mail:[e-mail]
如果可以请留下联系地址。
谢谢

[qixueqi]

顺便问一下
一般来说API程序不都要窗体注册吗
在我这个程序里：MyRegisterClass(hInstance);
这个注册函数不用好像对程序也没影响
请问这是为什么？


另：我这个程序是以dialog为主界面,在有些书上说那就需要两个注册函数，一个是注册窗体，一个是注册dialog的，是这样的吗？原因？

[chehw]

1.只有用CreateWindowEx创建窗口时才需注册窗口类.CreateDialog/CreateDialogParam不需要.
2.在DlgProc的WM_DESTROY: 中PostQuitMessage(0);
3. 在GetMessage循环里加入:if(IsDialogMessage(hDlg, &msg)) continue;
4. LRESULT CALLBACK WndProc(...)多余.