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91 lines
3.1 KiB
91 lines
3.1 KiB
//========= Copyright Valve Corporation, All rights reserved. ============// |
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// |
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// Purpose: Attaches a console for I/O to a Win32 GUI application in a |
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// reasonably smart fashion |
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// |
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//============================================================================= |
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#include "pch_tier0.h" |
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#if defined( _WIN32 ) |
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#include <windows.h> |
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#include <io.h> |
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#include <fcntl.h> |
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#include <iostream> |
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#endif // defined( _WIN32 ) |
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//----------------------------------------------------------------------------- |
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// |
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// Attach a console to a Win32 GUI process and setup stdin, stdout & stderr |
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// along with the std::iostream (cout, cin, cerr) equivalents to read and |
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// write to and from that console |
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// |
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// 1. Ensure the handle associated with stdio is FILE_TYPE_UNKNOWN |
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// if it's anything else just return false. This supports cygwin |
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// style command shells like rxvt which setup pipes to processes |
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// they spawn |
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// |
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// 2. See if the Win32 function call AttachConsole exists in kernel32 |
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// It's a Windows 2000 and above call. If it does, call it and see |
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// if it succeeds in attaching to the console of the parent process. |
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// If that succeeds, return false (for no new console allocated). |
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// This supports someone typing the command from a normal windows |
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// command window and having the output go to the parent window. |
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// It's a little funny because a GUI app detaches so the command |
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// prompt gets intermingled with output from this process |
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// |
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// 3. If thigns get to here call AllocConsole which will pop open |
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// a new window and allow output to go to that window. The |
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// window will disappear when the process exists so if it's used |
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// for something like a help message then do something like getchar() |
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// from stdin to wait for a keypress. if AllocConsole is called |
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// true is returned. |
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// |
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// Return: true if AllocConsole() was used to pop open a new windows console |
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// |
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//----------------------------------------------------------------------------- |
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bool SetupWin32ConsoleIO() |
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{ |
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#if defined( _WIN32 ) |
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// Only useful on Windows platforms |
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bool newConsole( false ); |
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if ( GetFileType( GetStdHandle( STD_OUTPUT_HANDLE ) ) == FILE_TYPE_UNKNOWN ) |
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{ |
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HINSTANCE hInst = ::LoadLibrary( "kernel32.dll" ); |
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typedef BOOL ( WINAPI * pAttachConsole_t )( DWORD ); |
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pAttachConsole_t pAttachConsole( ( BOOL ( _stdcall * )( DWORD ) )GetProcAddress( hInst, "AttachConsole" ) ); |
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if ( !( pAttachConsole && (*pAttachConsole)( ( DWORD ) - 1 ) ) ) |
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{ |
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newConsole = true; |
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AllocConsole(); |
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} |
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*stdout = *_fdopen( _open_osfhandle( reinterpret_cast< intptr_t >( GetStdHandle( STD_OUTPUT_HANDLE ) ), _O_TEXT ), "w" ); |
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setvbuf( stdout, NULL, _IONBF, 0 ); |
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*stdin = *_fdopen( _open_osfhandle( reinterpret_cast< intptr_t >( GetStdHandle( STD_INPUT_HANDLE ) ), _O_TEXT ), "r" ); |
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setvbuf( stdin, NULL, _IONBF, 0 ); |
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*stderr = *_fdopen( _open_osfhandle( reinterpret_cast< intptr_t >( GetStdHandle( STD_ERROR_HANDLE ) ), _O_TEXT ), "w" ); |
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setvbuf( stdout, NULL, _IONBF, 0 ); |
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std::ios_base::sync_with_stdio(); |
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} |
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return newConsole; |
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#else // defined( _WIN32 ) |
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return false; |
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#endif // defined( _WIN32 ) |
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} |