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有一问题已经扰我很长时间了:关于串口问题？急！！！
有一问题已经扰我很长时间了:
1 我编的程序用WIN API调用串口串口与交换机通信（手工维护太累）
2 必须先用其他工具使用串口并关闭后，我的程序才可通过串口进行通信，否则阻塞不可写读。
3 程序中DCB已设置正确
4 若用串口控件就不会出现上述问题
1 我编的程序用WIN API调用串口串口与交换机通信（手工维护太累）
2 必须先用其他工具使用串口并关闭后，我的程序才可通过串口进行通信，否则阻塞不可写读。
3 程序中DCB已设置正确
4 若用串口控件就不会出现上述问题
...全文
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zhangnanonnet 2004-04-12
你试试一下的打开串口方式
ZComm::open(char *szPort,int Baud_rate, BOOL overlapped)
{
int retbuflength=0;
if (overlapped) { //异步方式打开串口
memset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;
memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;
READ_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (READ_OS.hEvent == NULL) return -1 ;
WRITE_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (NULL == WRITE_OS.hEvent)
{
CloseHandle( READ_OS.hEvent ) ;
return -1 ;
}
idComDev=CreateFile( szPort, GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // no security attrs
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|
FILE_FLAG_OVERLAPPED, // overlapped I/O
NULL );
olap=TRUE;
} //同步方式打开串口
else idComDev=CreateFile( szPort, GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // no security attrs
OPEN_EXISTING,
0, //is overlapped or no
NULL );
if (idComDev==(HANDLE) -1){
DWORD RR=GetLastError();
CloseHandle(idComDev) ;
if (olap){
CloseHandle( READ_OS.hEvent ) ;
CloseHandle( WRITE_OS.hEvent ) ;
}
fCOMMOpened=0;
olap=FALSE;
return (0);
}
set_baudrate(Baud_rate);
fCOMMOpened=1;
SetupComm(idComDev,11520,2048);
PurgeComm(idComDev, PURGE_TXABORT | PURGE_RXABORT |
PURGE_TXCLEAR | PURGE_RXCLEAR ) ;
SetCommMask(idComDev,EV_RXCHAR/* EV_RXFLAG*/ );
//set time out
SetTimeOut(10,100,500);
return (1);
}
BOOL ZComm::SetTimeOut(DWORD ReadIntervalTimeout,
DWORD ReadTotalTimeoutMultiplier,
DWORD ReadTotalTimeoutConstant)
{
COMMTIMEOUTS timeouts;
GetCommTimeouts(idComDev,&timeouts);
timeouts.ReadIntervalTimeout=ReadIntervalTimeout;
timeouts.ReadTotalTimeoutMultiplier=ReadTotalTimeoutMultiplier;
timeouts.ReadTotalTimeoutConstant=ReadTotalTimeoutConstant;
return SetCommTimeouts(idComDev,&timeouts);
}
ZComm::Close()
{
if (fCOMMOpened==1) {
fCOMMOpened=0;
CloseHandle(idComDev) ;
olap=FALSE;
if (olap){
CloseHandle( READ_OS.hEvent ) ;
CloseHandle( WRITE_OS.hEvent ) ;
}
return 1;
}
return 0;
}
int ZComm::set_baudrate(int baud_rate)
{
DCB dcb;
BOOL fsuccess;
fsuccess = GetCommState(idComDev, &dcb);
if (!fsuccess) return 0;
dcb.BaudRate =baud_rate;
dcb.ByteSize =8; //number of bits/byte, 4-8
dcb.Parity =NOPARITY;
dcb.StopBits =ONESTOPBIT;
//dcb.EvtChar=0x02;
//dcb.fNull=TRUE;
fsuccess=SetCommState(idComDev, &dcb);
if (!fsuccess) return 0;
return 1;
}
ZComm::open(char *szPort,int Baud_rate, BOOL overlapped)
{
int retbuflength=0;
if (overlapped) { //异步方式打开串口
memset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;
memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;
READ_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (READ_OS.hEvent == NULL) return -1 ;
WRITE_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (NULL == WRITE_OS.hEvent)
{
CloseHandle( READ_OS.hEvent ) ;
return -1 ;
}
idComDev=CreateFile( szPort, GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // no security attrs
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|
FILE_FLAG_OVERLAPPED, // overlapped I/O
NULL );
olap=TRUE;
} //同步方式打开串口
else idComDev=CreateFile( szPort, GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // no security attrs
OPEN_EXISTING,
0, //is overlapped or no
NULL );
if (idComDev==(HANDLE) -1){
DWORD RR=GetLastError();
CloseHandle(idComDev) ;
if (olap){
CloseHandle( READ_OS.hEvent ) ;
CloseHandle( WRITE_OS.hEvent ) ;
}
fCOMMOpened=0;
olap=FALSE;
return (0);
}
set_baudrate(Baud_rate);
fCOMMOpened=1;
SetupComm(idComDev,11520,2048);
PurgeComm(idComDev, PURGE_TXABORT | PURGE_RXABORT |
PURGE_TXCLEAR | PURGE_RXCLEAR ) ;
SetCommMask(idComDev,EV_RXCHAR/* EV_RXFLAG*/ );
//set time out
SetTimeOut(10,100,500);
return (1);
}
BOOL ZComm::SetTimeOut(DWORD ReadIntervalTimeout,
DWORD ReadTotalTimeoutMultiplier,
DWORD ReadTotalTimeoutConstant)
{
COMMTIMEOUTS timeouts;
GetCommTimeouts(idComDev,&timeouts);
timeouts.ReadIntervalTimeout=ReadIntervalTimeout;
timeouts.ReadTotalTimeoutMultiplier=ReadTotalTimeoutMultiplier;
timeouts.ReadTotalTimeoutConstant=ReadTotalTimeoutConstant;
return SetCommTimeouts(idComDev,&timeouts);
}
ZComm::Close()
{
if (fCOMMOpened==1) {
fCOMMOpened=0;
CloseHandle(idComDev) ;
olap=FALSE;
if (olap){
CloseHandle( READ_OS.hEvent ) ;
CloseHandle( WRITE_OS.hEvent ) ;
}
return 1;
}
return 0;
}
int ZComm::set_baudrate(int baud_rate)
{
DCB dcb;
BOOL fsuccess;
fsuccess = GetCommState(idComDev, &dcb);
if (!fsuccess) return 0;
dcb.BaudRate =baud_rate;
dcb.ByteSize =8; //number of bits/byte, 4-8
dcb.Parity =NOPARITY;
dcb.StopBits =ONESTOPBIT;
//dcb.EvtChar=0x02;
//dcb.fNull=TRUE;
fsuccess=SetCommState(idComDev, &dcb);
if (!fsuccess) return 0;
return 1;
}
Sander 2004-04-12
Show your sourcecode.
rwdx 2004-04-12
看看你的代码，
DongBeiXiNan 2004-04-12
to zhangnanonnet(鱼欢) :
不行，read读出的是空格，write不起作用。
是否与其他工具应用通讯握手协议有关。
不行，read读出的是空格，write不起作用。
是否与其他工具应用通讯握手协议有关。
DongBeiXiNan 2004-04-11
关闭了
basboy 2004-04-11
你的程序每次打开了串口以后关闭句柄了吗