Querying the .Pdb File

A program database file (extension .pdb) is a binary file that contains type and symbolic debugging information gathered over the course of compiling and linking the project. A PDB file is created when you compile a C/C++ program with /ZI or /Zi or a Visual Basic, Visual C#, or JScript program with the /debug option. Object files contain references into the .pdb file for debugging information. For more information on pdb files, see PDB Files. A DIA application can use the following general steps to obtain details about the various symbols, objects, and data elements within an executable image.

To query the .pdb file

1. Acquire a data source by creating an IDiaDataSource interface.

   CComPtr<IDiaDataSource> pSource;
   hr = CoCreateInstance( CLSID_DiaSource,
                          NULL,
                          CLSCTX_INPROC_SERVER,
                          __uuidof( IDiaDataSource ),
                         (void **) &pSource);
   
   if (FAILED(hr))
   {
       Fatal("Could not CoCreate CLSID_DiaSource. Register msdia80.dll." );
   }
   

2. Call IDiaDataSource::loadDataFromPdb or IDiaDataSource::loadDataForExe to load the debugging information.

   wchar_t wszFilename[ _MAX_PATH ];
   mbstowcs( wszFilename, szFilename, sizeof( wszFilename )/sizeof( wszFilename[0] ) );
   if ( FAILED( pSource->loadDataFromPdb( wszFilename ) ) )
   {
       if ( FAILED( pSource->loadDataForExe( wszFilename, NULL, NULL ) ) )
       {
           Fatal( "loadDataFromPdb/Exe" );
       }
   }
   

3. Call IDiaDataSource::openSession to open an IDiaSession to gain access to the debugging information.

   CComPtr<IDiaSession> psession;
   if ( FAILED( pSource->openSession( &psession ) ) )
   {
       Fatal( "openSession" );
   }
   

4. Use the methods in IDiaSession to query for the symbols in the data source.

   CComPtr<IDiaSymbol> pglobal;
   if ( FAILED( psession->get_globalScope( &pglobal) ) )
   {
       Fatal( "get_globalScope" );
   }
   

5. Use the IDiaEnum* interfaces to enumerate and scan through the symbols or other elements of debug information.

   CComPtr<IDiaEnumTables> pTables;
   if ( FAILED( psession->getEnumTables( &pTables ) ) )
   {
       Fatal( "getEnumTables" );
   }
   CComPtr< IDiaTable > pTable;
   while ( SUCCEEDED( hr = pTables->Next( 1, &pTable, &celt ) ) && celt == 1 )
   {
       // Do something with each IDiaTable.
   }
   

See also

• IDiaDataSource