C++ String to C buffer

[verfranc]

Hi,

I have a C++ program compiled under g++ 4.  This program was running good when it was compiled under g++ 3.  Under g++ 4, this program exits w/o any error msg.  I have traced the code that caused this problem.  The code is :
...
char myInput[100];
...
string strInput = "1234567890abcdefg";
...
memset(myInput, '\0',  100);
strcpy((char*)myInput, strInput.c_str());     // This is where it hangs or exits
...


So I successfully re-code this to :
...
unsigned char* myInput;
...

string strInput = "1234567890abcdefg";
...
myInput = (unsigned char*)mallac(100);
if (!myInput) {
  return;
}
memset(myInput, '\0', 100);
strcpy((char*)myInput, strInput.c_str());
...


Is it not right to copy a C++ String to a C buffer? What's the difference if I copy a C++ String to a pointer to a string?  By the way, I have compiled the above code using the default parameters of g++.

Thanks,
Van

---

View this message in context: C++ String to C buffer
Sent from the Gnu - Common C++ forum at Nabble.com.