Shell VB App From C++ Code

Hello,
I have an open source C++ command line tool of which I'm trying to manipulate the source code to modify its functionality for my personal use.
I have very limited knowledge of C++, and I need some help on how to synchronously shell another program (a VB app for that matter) with the initial argument line that was passed to the original C++ tool. The arguments parts is as troublesome as the "shelling" part because I'm not sure how to rebuild the arg. line from the argv[] array.

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string>

int main(int argc, char **argv)
{
        FILE *proc;
        std::string command = "vbapp.exe";
       
        for(int i=1;i<argc;i++)
        {
                command += " " + argv[i];
        }
       
        if (proc = _popen(command.c_str(), "rt"))
        {
                while(fgetc(proc) != EOF);
               
                if (feof(proc))
                {
                        return _pclose(proc);
                }
                else
                {
                        return 1;
                }
        }
        else
        {
                return 1;
        }
}

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