passing string from RPC client to server

[Wolvorine]

Hi,

I need to return the string data from the RPC function that i am calling. String will be very dynamic so i am interested in using stl string inside the idl.


I tried dynamic arrays but i am unable to persist the pointer from heap corruption... e.g. here is my idl code

interface myinterface
{

void RPC_GetGroupStatusEx([out] char ** szXMLString);

}

server implemented code

void RPC_GetGroupStatusEx(unsigned char ** szXMLString)
{
     
   CString strXmlRawData = GetSomeXmlData(); //it return xml string

    unsigned char* dyn = new unsigned char[strXmlRawData.GetLength()];

    sprintf((char*)dyn,"%s", strXmlRawData.GetBuffer());
	
   *szXMLString =dyn;
}

client caller code

unsigned char *ms = NULL; 

//i have tried even initialized pointer by sending it to the server but it also gave me heap corruption , also i have used address of pointer but same result

          RpcTryExcept
	   {
		
		   RPC_GetGroupStatusEx(&ms);

	   }
	   RpcExcept(1)
	   {
		   int a = RpcExceptionCode();
		  
		  std::cerr << "Runtime reported exception " << RpcExceptionCode()
					<< std::endl;
	   }
	   RpcEndExcept

it always crash at the server side code after leaving that function , one more thing is RPC server is on the different machine. Every other functions with data types works fine except string.


Please guide me what i am doing wrong in the code? How can i use stl string inside the idl file ?


Regards