vc++6.0 CSerialPort类实现串口编程，编译链接通过后，运行出错，如下。大神帮帮忙！
出错信息
Microsoft Visual C++ Runtime Library
Assertion failed!
Program: ...c++6.0\SerialPortTest\Debug\SerialPortTest.exe
File: C:\Users\zy\Documents\vc++6.0\SerialPortTes...
Line: 112
Expression: portnr > 0 && portnr < 200
For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts
(Press Retry to debug the application - JIT must be enabled)
中止(A) 重试(R) 忽略(I)
