如何获取EnumWindows列出所有窗口？ [英] How can I get EnumWindows to list all windows?

问题描述

我假设，我要求的实际上应该是默认值，但我遇到一些我不明白的行为。

  #includestdafx.h
 
 using namespace std; 
 
 BOOL CALLBACK enumWindowsProc（
 __in HWND hWnd，
 __in LPARAM lParam 
）{
 if（！:: IsIconic（hWnd））{
 return TRUE; 
} 
 
 int length = :: GetWindowTextLength（hWnd）; 
 if（0 == length）return TRUE; 
 
 TCHAR * buffer; 
 buffer = new TCHAR [length + 1]; 
 memset（buffer，0，（length + 1）* sizeof（TCHAR））; 
 
 GetWindowText（hWnd，buffer，length + 1）; 
 tstring windowTitle = tstring（buffer）; 
 delete [] buffer; 
 
 wcout<< hWnd< TEXT（：）< windowTitle<< std :: endl; 
 
 return TRUE; 
} 
 
 int _tmain（int argc，_TCHAR * argv []）{
 wcout< TEXT（Enumerating Windows ...）< endl 
 BOOL enumeratingWindowsSucceeded = :: EnumWindows（enumWindowsProc，NULL）; 
 cin.get（）; 
 return 0; 
} 
  

如果我调用该代码，它将列出所有最小化的窗口：

现在， m不再只对最小化的窗口感兴趣，现在我想要所有的。所以我删除 IsIconic 检查：

  BOOL CALLBACK enumWindowsProc $ b __in HWND hWnd，
 __in LPARAM lParam 
）{
 / * 
 if（！:: IsIconic（hWnd））{
 return TRUE; 
} 
 * / 
 
 int length = :: GetWindowTextLength（hWnd）; 
 if（0 == length）return TRUE; 
 
 TCHAR * buffer; 
 buffer = new TCHAR [length + 1]; 
 memset（buffer，0，（length + 1）* sizeof（TCHAR））; 
 
 GetWindowText（hWnd，buffer，length + 1）; 
 tstring windowTitle = tstring（buffer）; 
 delete [] buffer; 
 
 wcout<< hWnd< TEXT（：）< windowTitle<< std :: endl; 
 
 return TRUE; 
} 
  

现在我获得所有窗口 （此时不列出之前列出的窗口句柄）：

为了完整性，这是 stdafx.h ：

  #pragma once 
 
 #includetargetver.h
 
 
 #include< iostream> 
 #include< map> 
 #include< string> 
 
命名空间std {
 #if定义_UNICODE ||定义UNICODE 
 typedef wstring tstring; 
 #else 
 typedef string tstring; 
 #endif 
} 
 
 #include< stdio.h> 
 #include< tchar.h> 
 #include< Windows.h> 
 #include< psapi.h> 
  

我做什么错了？

解决方案

这是（如我假设） EnumWindows 不是一个问题。

在调试时，我发现 enumWindowsProc 在每个窗口都被调用，但是一些迭代只是不生成输出。

暂时，我切换到使用 _tprintf 但是我不明白原来的代码有什么问题。调用 wcout.flush（）也没有理想的效果。

I'm assuming, what I'm asking should actually be the default, but I'm experiencing some behavior I don't understand.

#include "stdafx.h"

using namespace std;

BOOL CALLBACK enumWindowsProc(
  __in  HWND hWnd,
  __in  LPARAM lParam
) {
  if( !::IsIconic( hWnd ) ) {
    return TRUE;
  }

  int length = ::GetWindowTextLength( hWnd );
  if( 0 == length ) return TRUE;

  TCHAR* buffer;
  buffer = new TCHAR[ length + 1 ];
  memset( buffer, 0, ( length + 1 ) * sizeof( TCHAR ) );

  GetWindowText( hWnd, buffer, length + 1 );
  tstring windowTitle = tstring( buffer );
  delete[] buffer;

  wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;

  return TRUE;
}

int _tmain( int argc, _TCHAR* argv[] ) {
  wcout << TEXT( "Enumerating Windows..." ) << endl;
  BOOL enumeratingWindowsSucceeded = ::EnumWindows( enumWindowsProc, NULL );
  cin.get();
  return 0;
}

If I invoke that code, it will list all minimized windows:

Now, I'm no longer interested in only the minimized windows, now I want all of them. So I remove the IsIconic check:

BOOL CALLBACK enumWindowsProc(
  __in  HWND hWnd,
  __in  LPARAM lParam
) {
  /*
  if( !::IsIconic( hWnd ) ) {
    return TRUE;
  }
  */

  int length = ::GetWindowTextLength( hWnd );
  if( 0 == length ) return TRUE;

  TCHAR* buffer;
  buffer = new TCHAR[ length + 1 ];
  memset( buffer, 0, ( length + 1 ) * sizeof( TCHAR ) );

  GetWindowText( hWnd, buffer, length + 1 );
  tstring windowTitle = tstring( buffer );
  delete[] buffer;

  wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;

  return TRUE;
}

Now I get all windows except the minimized ones (none of the previously listed window handles are listed this time):

For completeness, this is the stdafx.h:

#pragma once

#include "targetver.h"


#include <iostream>
#include <map>
#include <string>

namespace std {
  #if defined _UNICODE || defined UNICODE
    typedef wstring tstring;
  #else
    typedef string tstring;
  #endif
}

#include <stdio.h>
#include <tchar.h>
#include <Windows.h>
#include <psapi.h>

What am I doing wrong?

解决方案

It's (as I assumed) not a problem with EnumWindows at all. The problem is with the output stream.

While debugging, I noticed that enumWindowsProc is called just fine for every window, but that some iterations are simply not generating output.

For the time being, I switched to using _tprintf, but I don't understand what the problem with the original code is. Calling wcout.flush() had no desirable effect either.

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