Apr 2nd, 2004, 06:09 | #1 |
Senior Member
注册日期: Jul 2004
帖子: 390
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我参照例子, 用CREATEFILE取的COM1的HANDLE, 然后设置其配置, 最后, 用READFILE来获取COM1的数据, 但是, 每次一到READFILE, 就会报 INVALID HANDLE的错误, why? 大致代码: //取得COM1的HANDLE HANDLE m_Port = CreateFile("COM1:",GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL); if (m_Port == INVALID_HANDLE_VALUE){ // Handle the error. return false ; } // 配置COM1 DCB dcb; if (!GetCommState(m_Port, &dcb)){ return false; } dcb.BaudRate = CBR_9600; // set the baud rate dcb.ByteSize = 8; // data size, xmit, and rcv dcb.Parity = NOPARITY; // no parity bit dcb.StopBits = ONESTOPBIT; // one stop bit if (!SetCommState(m_Port, &dcb)){ return false; } //读取数据 char input[200]; unsigned int lenBuff = 200; LPDWORD lenMessage; String *strResult; if(ReadFile(m_Port,input,lenBuff,lenMessage,NULL)==0){ //这里会有EXCEPTION return false; } |
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Apr 2nd, 2004, 12:14 | #2 |
Senior Member
注册日期: Jul 2004
帖子: 390
声望: 92
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连什么DLL? 我只是用了: #INCLUDE <WINDOWS.H> 这个是WIN32的API吧? 怎么都不行, CLOSEHANDLE也不行. 该查什么书呢? MICROSOFT的MSDN我都看了无数遍了... |
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