error C2712: Cannot use _try in functions that require object unwinding

error C2712: Cannot use __try in functions that require object unwinding

原文：http://social.msdn.microsoft.com/Forums/en/vcgeneral/thread/42985583-36fb-4e14-8642-bd837aac0727

I have a code that is called on a pointer that may be invalid (I have no control over its value):

__try{  CString str = (LPCTSTR)wParam;  //Work with 'str' now}__except(1){  //Memory fault}

But when I try to use it in a MFC project, it gives me this error:

error C2712: Cannot use __try in functions that require object unwinding

解决方法：

__try
{
? DoStuffWithWParam(wParam);
}
__except(1)
{
? //Memory fault
}

void DoStuffWithWParam(WPARAM wParam) {

CString str = (LPCTSTR)wParam;

? //Work with 'str' now
}