Question

Is this correct way? I have tried many ways, it seems that does not work properly

CString result;
result  = ExecuteExternalProgram(L"c.txt", L"t.txt");   // return a CString

if (result == _T("one"))
    MessageBox(NULL,result.GetBuffer(), L"one", MB_OK);
else
        MessageBox(NULL,result.GetBuffer(), L"two", MB_OK);

Answer 1

C strings can’t be compared with == — == compares whether the result pointer is the same as the pointer to your translated string. They won’t be equal. If you’re going to use C strings, then you should use C string comparison functions:

if (0 == strcmp(result, _T("one")) /* ... */ else /* ... */