int main(int argc, char *argv[])
{
SDL_Init(SDL_INIT_JOYSTICK | SDL_INIT_VIDEO);
// etc...
}
Any way to force a console window?
Author
Hi,
I just started another project using SDL and it occurs to me that I'd really like to be running a console window so that I can debug it on the fly, rather than having all my 'cout's dumped in a .txt file when the program ends.
I'm using VS '05 and initialising with the usual:
You can use a function like AllocConsole() to get a console, and use freopen with stdin/out to redirect output to that... I think ( I haven't tried it ) [smile]
Here's what I do in my LogManager class. Call FreeConsole() when you are done with it. All my output, even from Python and Lua, goes to the console window.
void LogManagerConsole::redirectIo() { int hConHandle; long lStdHandle; CONSOLE_SCREEN_BUFFER_INFO coninfo; FILE *fp; // allocate a console for this app AllocConsole(); // set the screen buffer to be big enough to let us scroll text GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &coninfo); coninfo.dwSize.Y = MaxConsoleLines; SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), coninfo.dwSize); // position it const char* uniqueTitle = "my_console_window"; SetConsoleTitle(uniqueTitle); Sleep(40); HWND consoleWnd = FindWindow(NULL, uniqueTitle); SetWindowPos(consoleWnd, HWND_TOP, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOZORDER); SetConsoleTitle("My log window"); // redirect unbuffered STDOUT to the console lStdHandle = (long)GetStdHandle(STD_OUTPUT_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); fp = _fdopen( hConHandle, "w" ); *stdout = *fp; setvbuf( stdout, NULL, _IONBF, 0 ); // redirect unbuffered STDIN to the console lStdHandle = (long)GetStdHandle(STD_INPUT_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); fp = _fdopen( hConHandle, "r" ); *stdin = *fp; setvbuf( stdin, NULL, _IONBF, 0 ); // redirect unbuffered STDERR to the console lStdHandle = (long)GetStdHandle(STD_ERROR_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); fp = _fdopen( hConHandle, "w" ); *stderr = *fp; setvbuf( stderr, NULL, _IONBF, 0 ); // make cout, wcout, cin, wcin, wcerr, cerr, wclog and clog point to console as well std::ios::sync_with_stdio();}
Author
Greenlights across the board except 'MaxConsoleLines'? Is this in a header somewhere or do you define it yourself?
coninfo.dwSize.Y = MaxConsoleLines;
CONSOLE_SCREEN_BUFFER_INFO
dwSize
A COORD structure that contains the size of the console screen buffer, in character columns and rows.
Y is the horizontal value ie character columns
MaxConsoleLines appears to be a global constant. It's probably set to 80. That is the typical number of characters per column in a console window.
CONSOLE_SCREEN_BUFFER_INFO
dwSize
A COORD structure that contains the size of the console screen buffer, in character columns and rows.
Y is the horizontal value ie character columns
MaxConsoleLines appears to be a global constant. It's probably set to 80. That is the typical number of characters per column in a console window.
Characters per column doesn't make any sense. That should be characters per line (or per row). And Y suggests vertical not horizontal (doh!!). That would mean that MaxConsoleLines is probably set to 25. 25 lines at 80 characters per line. Sorry for the bum steer. I inverted the two.
Oops, sorry about the MaxConsoleLines. That field, according to MSDN, is:
dwSize
A COORD structure that contains the size of the console screen buffer, in character columns and rows.
I have the Y set to 200. It can be whatever you want the buffer to be able to hold.
dwSize
A COORD structure that contains the size of the console screen buffer, in character columns and rows.
I have the Y set to 200. It can be whatever you want the buffer to be able to hold.
This topic is closed to new replies.
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