Listing 2: Implementation of Win95 tracing facility to mimic that of NT
#include "windows.h" #include <stdio.h> #include <stdarg.h> #include <process.h> #include "w95trace.h" #ifdef _DEBUG void OutputDebugStringW95( LPCTSTR lpOutputString, ...) { HANDLE heventDBWIN; /* DBWIN32 synchronization object */ HANDLE heventData; /* data passing synch object */ HANDLE hSharedFile; /* memory mapped file shared data */ LPSTR lpszSharedMem; char achBuffer[500]; /* create the output buffer */ va_list args; va_start(args, lpOutputString); vsprintf(achBuffer, lpOutputString, args); va_end(args); /* Do a regular OutputDebugString so that the output is still seen in the debugger window if it exists. This ifdef is necessary to avoid infinite recursion from the inclusion of W95TRACE.H */ #ifdef _UNICODE ::OutputDebugStringW(achBuffer); #else ::OutputDebugStringA(achBuffer); #endif /* bail if it's not Win95 */ { OSVERSIONINFO VerInfo; VerInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&VerInfo); if ( VerInfo.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS ) return; } /* make sure DBWIN is open and waiting */ heventDBWIN = OpenEvent(EVENT_MODIFY_STATE, FALSE, "DBWIN_BUFFER_READY"); if ( !heventDBWIN ) { return; } /* get a handle to the data synch object */ heventData = OpenEvent(EVENT_MODIFY_STATE, FALSE, "DBWIN_DATA_READY"); if ( !heventData ) { // MessageBox(NULL, "DBWIN_DATA_READY nonexistent", NULL, MB_OK); CloseHandle(heventDBWIN); return; } hSharedFile = CreateFileMapping((HANDLE)-1, NULL, PAGE_READWRITE, 0, 4096, "DBWIN_BUFFER"); if (!hSharedFile) { CloseHandle(heventDBWIN); CloseHandle(heventData); return; } lpszSharedMem = (LPSTR)MapViewOfFile(hSharedFile, FILE_MAP_WRITE, 0, 0, 512); if (!lpszSharedMem) { CloseHandle(hSharedFile); CloseHandle(heventDBWIN); CloseHandle(heventData); return; } /* wait for buffer event */ WaitForSingleObject(heventDBWIN, INFINITE); /* write it to the shared memory */ *((LPDWORD)lpszSharedMem) = _getpid(); wsprintf(lpszSharedMem + sizeof(DWORD), "%s", achBuffer); /* signal data ready event */ SetEvent(heventData); /* clean up handles */ CloseHandle(hSharedFile); CloseHandle(heventData); CloseHandle(heventDBWIN); return; } #endif /* End of File */