{"id":91,"date":"2013-08-06T05:33:00","date_gmt":"2013-08-06T05:33:00","guid":{"rendered":"https:\/\/praveenkatiyar.wordpress.com\/?p=91"},"modified":"2013-08-06T05:33:00","modified_gmt":"2013-08-06T05:33:00","slug":"modifying-array-of-string-values-default-marshaling","status":"publish","type":"post","link":"https:\/\/praveenkatiyar.in\/blog\/index.php\/2013\/08\/06\/modifying-array-of-string-values-default-marshaling\/","title":{"rendered":"Modifying array of string values (default Marshaling)"},"content":{"rendered":"

Define some functions in native dll (let say it \u201cWin32Native.dll<\/strong>\u201d)  as shown below. this function receives array of char pointers (string). <\/p>\n

extern "C" __declspec(dllexport) void ModifyStringArrayValues( int nCount, char* ppStrArray[] )<\/font><\/font><\/font>
<\/strong><\/p>\n

Implementing Functions<\/h3>\n

extern "C" __declspec(dllexport) void ModifyStringArrayValues( int nCount, char* ppStrArray[] )
{
    size_t cchDest = 40;
    const size_t alloc_size = sizeof(char) * 40;
    for ( int nI = 0; nI < nCount; nI++ )
    {
        char *pszFormat = "<<from DLL>> [Modified String %2d]";
        STRSAFE_LPSTR temp = (STRSAFE_LPSTR)CoTaskMemAlloc( alloc_size );
        StringCchPrintfA(temp, cchDest, pszFormat, nI);
        CoTaskMemFree( ppStrArray[nI] );
        ppStrArray[nI] = (char *) temp;
   }
}<\/strong><\/font><\/p>\n

<\/strong><\/p>\n

Point of Interest<\/h4>\n