問：

在cmd.exe下運行rundll32.exe mydll.dll,MyFunc ,本想直接在當前cmd窗口輸出調試信息.
可因rundll32是Win32 GUI程序而非Win32 console,所以cmd.exe標準輸入輸出句柄無法被mydll.dll繼承用來向父進程cmd.exe輸出數(shù)據(jù).
這時, 如果用強行用GetStdHandle獲得句柄,然后用WriteConsole來進行輸出,則會發(fā)生無效句柄錯誤.
但是如果在這之前先AllocConsole,則可正常WriteConsole,但是會新建個控制臺窗口來輸出數(shù)據(jù),很不爽 :-P

有沒有什么辦法向當前cmd.exe窗口輸出數(shù)據(jù)呢?

我想通過給進程拍照和遍歷,
可以獲得rundll32的父進程cmd.exe的PID和Handle,但如何進一步下去(建立管道, 寫數(shù)據(jù))就沒轍了?

不知道有沒有描述清楚 還是太羅嗦了,麻煩大家看看,謝謝~

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答：

如果只是要輸出數(shù)據(jù)的話 可以向父窗口 發(fā)送鍵盤消息 WM_CHAR 輸出你的數(shù)據(jù)

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代碼

Code:

BOOL APIENTRY DllMain ( HANDLE hModule ,
??????????????????????? DWORD??ul_reason_for_call ,
??????????????????????? LPVOID lpReserved )
{
????switch ( ul_reason_for_call )
????{
????????case DLL_PROCESS_ATTACH :
???????????? ShowMe ();
????????????
????????case DLL_THREAD_ATTACH :
????????case DLL_THREAD_DETACH :
????????case DLL_PROCESS_DETACH :
????????????break;

????}
????return TRUE ;
}


void ShowMe ()
{
???? DWORD????dwProcID ;
???? HWND????hWnd ;
???? dwProcID = FindParentProcID ( GetCurrentProcessId ());
???????? sprintf ( buf , "dwProcID:%d\nProcessId:%d " ,?? dwProcID , GetCurrentProcessId ());
???????? MessageBox ( NULL , buf , "提示" , MB_ICONERROR );
????if( dwProcID == - 1 )
????????return;

???? hWnd = GetProcessMainWnd ( dwProcID );
????if( hWnd == NULL )
????????return;

???? SendMessage ( hWnd , WM_CHAR , WPARAM ( 'Z' ), NULL );
}


Code:

DWORD FindParentProcID ( DWORD dwChildProcID )???????? //找到返回父進程PID, 找不到返回-1
{
???? PROCESSENTRY32?????pr32 = { 0 };
???? pr32 . dwSize = sizeof ( PROCESSENTRY32 );??? // 不要漏了這句

????// 提權先
???? DebugPrivilege ( SE_DEBUG_NAME , TRUE );????
???? // 給進程照相
???? HANDLE hSnap = CreateToolhelp32Snapshot ( TH32CS_SNAPPROCESS , 0 );
???? // 拍照失敗, 返回-1
???? if ( hSnap == ( HANDLE )- 1 ) return ( DWORD )- 1 ;
????
???? // 開始枚舉...
???? if ( Process32First ( hSnap ,& pr32 ) == FALSE )??
????{
???????? CloseHandle ( hSnap );
????????return ( DWORD )- 1 ;
????}

????do
????{
????????if( pr32 . th32ProcessID == dwChildProcID )??
????????{???????????? // 如果被枚舉到的進程ID等于所給的ID, 則返回父進程ID
???????????? CloseHandle ( hSnap );
????????????return pr32 . th32ParentProcessID ;
????????}
????}
????while( Process32Next ( hSnap , & pr32 ));

???? // 找不到父進程ID, 返回-1
???? CloseHandle ( hSnap );
????return - 1 ;
}


Code:

typedef struct tagWNDINFO
{
???? DWORD dwProcessId ;
???? HWND hWnd ;
} WNDINFO , * LPWNDINFO ;

BOOL CALLBACK YourEnumProc ( HWND hWnd , LPARAM lParam )
{
???? DWORD dwProcessId ;
???? GetWindowThreadProcessId ( hWnd , & dwProcessId );
???? LPWNDINFO pInfo = ( LPWNDINFO ) lParam ;
????if( dwProcessId == pInfo -> dwProcessId )
????{
???????? pInfo -> hWnd = hWnd ;
????????return FALSE ;
????}
????return TRUE ;
}

HWND GetProcessMainWnd ( DWORD dwProcessId )???????? // 找到返回進程主窗口的hWnd, 如果沒有,返回NULL
{
???? WNDINFO wi ;
???? wi . dwProcessId = dwProcessId ;
???? wi . hWnd = NULL ;
???? EnumWindows ( YourEnumProc ,( LPARAM )& wi );
????return wi . hWnd ;
}

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