Program using the revised serialport class, warnings before http://blog.csdn.net/liquanhai/article/details/6941574#1536434-qzone-1-48146-cac534f6a16e831f54c45c717ec6acf9
So will the

 assert (portnr & gt; 0 & amp; & Portnr & lt; 5); 

commented out, run the following dialog appears after the

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