IDiaSession::findLinesByLinenum

compiland

[in] An IDiaSymbol object that represents the compiland in which to search for the line numbers. This parameter cannot be NULL.

file

[in] An IDiaSourceFile object that represents the source file to search in. This parameter cannot be NULL.

linenum

[in] Specifies a one-based line number.

Note
You cannot use zero to specify all lines (use the IDiaSession::findLines method to find all lines).

column

[in] Specifies the column number. Use zero to specify all columns. A column is a byte offset into a line.

ppResult

[out] Returns an IDiaEnumLineNumbers objta that contains a list of the line numbers retrieved.

If successful, returns S_OK; otherwise, returns an error code.

The following example shows how to open a source file, enumerate the compilands contributed by this file, and locate the line numbers in the source file where each compiland starts.

void ShowLinesInCompilands(IDiaSession *pSession, LPCOLESTR filename)
{
    IDiaEnumSourceFiles* pEnum;
    IDiaSourceFile*      pFile;
    DWORD                celt;

    pSession->findFile ( NULL, filename, nsFNameExt, &pEnum );
    while ( pEnum->Next ( 1, &pFile, &celt ) == S_OK ) // for each file
    {
        IDiaEnumSymbols* pEnumCompilands;
        IDiaSymbol* pCompiland;

        pFile->get_compilands ( &pEnumCompilands );
        // for each compiland
        while ( pEnumCompilands->Next ( 1, &pCompiland, &celt ) == S_OK )
        {
            IDiaEnumLineNumbers* pEnum;
            // Find first compiland closest to line 1 of the file.
            if (pSession->findLinesByLinenum( pCompiland, pFile, 1, 0, &pEnum ) == S_OK)
            {
                IDiaLineNumber *pLineNumber;
                DWORD lineCount;
                while ( pEnum->Next(1,&pLineNumber,&lineCount) == S_OK)
                {
                     DWORD lineNum;
                     if (pLineNumber->get_line(&lineNum) == S_OK)
                     {
                          printf("compiland starts in source at line number = %lu\n",lineNum);
                     }
                }
            }
        }
    }
}

Reference