{"id":74,"date":"2013-08-04T14:20:00","date_gmt":"2013-08-04T14:20:00","guid":{"rendered":"https:\/\/praveenkatiyar.wordpress.com\/?p=74"},"modified":"2013-08-04T14:20:00","modified_gmt":"2013-08-04T14:20:00","slug":"fetching-an-array-of-strings-from-a-native-dll","status":"publish","type":"post","link":"https:\/\/praveenkatiyar.in\/blog\/index.php\/2013\/08\/04\/fetching-an-array-of-strings-from-a-native-dll\/","title":{"rendered":"Fetching an array of strings from a Win32 DLL"},"content":{"rendered":"

Define  a function in native dll (let say it \u201cWin32Native.dll<\/strong>\u201d)  as shown below.<\/p>\n

extern "C" __declspec(dllexport) void FetchStringArray( int nCount, char* ppStrArray[])
{
    int result = 0;
    STRSAFE_LPSTR temp;
    size_t cchDest = 40;<\/strong><\/span><\/p>\n

    const size_t alloc_size = sizeof(char) * 40;<\/strong><\/span><\/p>\n

    for ( int nI = 0; nI < nCount; nI++ )
    {
       char *pszFormat = "from DLL >> [returned String %d]";
       STRSAFE_LPSTR temp = (STRSAFE_LPSTR)CoTaskMemAlloc( alloc_size );
       StringCchPrintfA(temp, cchDest, pszFormat, nI);<\/strong><\/span><\/p>\n

       CoTaskMemFree( ppStrArray[nI] );
       ppStrArray[nI] = (char *) temp;
    }
}<\/strong><\/font><\/p>\n

Point of Interest<\/h4>\n