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copied!<p>Some further tests showed that the logging from the dll works if I link it to a console application instead of a windows application. And if I change the backend to "file" instead of "console" the windows application do log correctly to the file. So the problem seem to be that the windows application doesn't have a "console".</p> <p>The solution was to redirect standard output/input pipes to a new console. This has to be done for a win32 application since a console is not created by default.</p> <pre><code>void RedirectIOToConsole() { 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 = MAX_CONSOLE_LINES; SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), coninfo.dwSize); // 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(); } </code></pre> <p>And then call this function from DllMain.</p> <pre><code>BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: { RedirectIOToConsole(); int panres = pantheios::pantheios_init(); if(panres < 0) { fprintf(stderr, "Failed to initialise the Pantheios libraries: %s\n", pantheios::pantheios_getInitErrorString(panres)); return FALSE; } // Set the file name for all back-ends. //pantheios_be_file_setFilePath("output.log"); } break; case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: break; case DLL_PROCESS_DETACH: pantheios::pantheios_uninit(); break; } return TRUE; } </code></pre>

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