com口出错,求助(20分)

串口通讯用的是creatfile 函数 打开串口.<br>可是经常出现 串口打开失败的情况. 重启程序不管用.重启电脑又可以打开了!!!!<br>begin<br> &nbsp; &nbsp;dwShareMode:=0;<br> &nbsp;end;<br><br> &nbsp;m_hComm := CreateFile( &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//创建文件（串口），取得操作句柄<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;PChar(sCommPort), &nbsp; &nbsp;//文件名称<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //'//./COM10',<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;GENERIC_READ or GENERIC_WRITE, &nbsp; &nbsp;//操作方式(读或写)<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;dwShareMode, &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//共享方式<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;nil, &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //SD<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;OPEN_EXISTING, &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//文件创建方法<br> FILE_ATTRIBUTE_NORMAL, &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //文件属性<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //handle to template file

端口打开后没有正确释放，或者根本就没有释放

我用了CloseHandle(self.m_hComm); <br>不知道是不是释放不成功啊!!<br>有什么好的建议吗?<br>我正在调试!

能不能在打开串口前, 先关闭一次串口?<br>可是打开串口前, 定义的句柄是空的,不知道如何取得某个串口的地址,比如com1,能否不用句柄,直接关闭com1口?

可以采用 try catch语句试试

问题解决了，我换了台电脑就好了，是电脑的故障吧！对everhappy表示感谢！