C++ Windows DLL: Exception Handling in Different Function

This is more of a design suggestion I need. Below code is from a C++ dll that am working on and this dll is called by many client executables. InputParams is a pointer to client exe.

The dll calls functions in the client to get certain values and the client doesn't have any exception build into it. So i need to implement exception handling in dll code.

for e.g., in the line input->getName, if it returns a NULL pointer or if status == ERROR, then I need to throw exception and catch it in GetNumbers function.

void Metrics::GetNumbers(InputParams* input, OutputParams* output)
    {
        int i, x, k;
        int status = 0;
        char* mesg;

        try{
             const char* name = input->getName(&status, &mesg); //this returns a name string 
             //and status will contain whether success or failure and mesg will have any error 
             //messages.

             const char* age = input->getAge(&status, &mesg);

            //Many other similar calls to client

             vector <int> myVectorNumers* = input->getNumberArray(&status, &mesg);

             vector <int> myVectorInfos* = input->getInfoArray(&status, &mesg);

            //Many other similar calls to client;
           }
         catch (std::exception e&)
         {
             // TODO
         }
         catch (string msg)
         {
             // TODO
         }

I came up with a way of doing it. And this is the snippet of code.

string errorMsg = "";
const char* name = input->getName(&status, &mesg); 

if (name == NULL || status == ERROR) // ERROR == 0
{
   errorMsg = mesg;
   throw errorMsg;
}

const char* age = input->getAge(&status, &mesg);

if (age== NULL || status == ERROR)
{
   errorMsg = mesg;
   throw errorMsg;
}

//Same for other calls to client using **input** pointer

Now as you see, I have to duplicate almost the same code in every place were there should be an exception check.

What am looking for is?

    string errorMsg = "";
    const char* name = input->getName(&status, &mesg); 

    CheckException(name, status, mesg, &errorMsg); // this function should do the error check and then throw the exception. And that exception should be caught by catch block in **GetNumbers** function.

    const char* age = input->getAge(&status, &mesg);

    CheckException(age, status, mesg, &errorMsg);

I have no idea whether even this is possible.

So a dummy implementation of CheckException will look like......

std::exception CheckException (/*1st parameter needs to be template type*/T* var, int status, string mesg, string *errorMsg)
{

    if (var == NULL || status == ERROR)
    {
        errorMsg = mesg;
        return /*TODO*/;  //Not sure how to return a throw
    }
}

1st of all, is this possible? Or is there a better way of doing this?

If you can provide me some sample code, that will be great!