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我正在使用重叠 I/O 来读取和写入串行端口。从命令提示符执行 exe 时，程序会崩溃(“xxxx.exe 遇到问题，需要关闭...”)。使用它的代码块是应用程序崩溃的地方，在它崩溃并且工作正常之前被调用了几次。奇怪的是，当我在 Debug模式下从 VC++ 2010 运行可执行文件时，它不会崩溃。
这是 GetOverlappedResult() 崩溃的代码块...
memset( &ov, 0, sizeof(OVERLAPPED) );
ov.hEvent = CreateEvent( NULL, TRUE, TRUE, NULL );
if( !Comm.Read( lpbBuffer, 1, &dwBytesRead, &ov ) )
if( GetLastError() != ERROR_IO_PENDING )
return FALSE;
if( !Comm.GetOverlappedResult(&ov,&dwBytesRead,TRUE) )
{
printf("Resync: Comm.GetOverlappedResult() failed with error code %u\n", GetLastError() );
return FALSE;
}
Comm.GetOverlappedResult() 源码
BOOL SerialAsync::GetOverlappedResult( LPOVERLAPPED lpOverlapped, LPDWORD lpNumberOfBytesTransferred, BOOL bWait )
{
printf("made it here\n");
BOOL ret = ::GetOverlappedResult( hComm, lpOverlapped, lpNumberOfBytesTransferred, bWait );
printf("made it here too\n");
return ret;
}
我已确保 hComm、重叠结构和指向 lpNumberOfBytesTransferred 的指针有效。
编辑
添加调试器环境变量后，程序会在调试器中崩溃...调试器打开文件tidtable.c，指向#ifdef后的第一行代码
/***
* __set_flsgetvalue - crt wrapper for setting up FlsGetValue pointer in TLS
*
* Purpose:
* This function helps msvcmXX.dll threadstart and threadstartex APIs
* to set FlsGetValue pointer before calling __fls_getvalue.
*
*******************************************************************************/
_CRTIMP PFLS_GETVALUE_FUNCTION __cdecl __set_flsgetvalue()
{
#ifdef _M_IX86
PFLS_GETVALUE_FUNCTION flsGetValue = FLS_GETVALUE;
if (!flsGetValue)
{
flsGetValue = DecodePointer(gpFlsGetValue);
TlsSetValue(__getvalueindex, flsGetValue);
}
return flsGetValue;
#else /* _M_IX86 */
return NULL;
#endif /* _M_IX86 */
}
edit2
这是在终止之前正在调用的函数
BOOL Resync( LPBYTE lpbBuffer )
{
DWORD dwBytesRead;
while( Comm.Read( lpbBuffer, 1, &dwBytesRead ) )
if( DDCMP_SOH == *lpbBuffer || DDCMP_ENQ == *lpbBuffer )
return TRUE;
return FALSE;
}
这就是我将我的 AsyncSerial::Read() 命令更改为
BOOL SerialAsync::ReadOverlapped( LPBYTE lpbBuffer, DWORD dwSize, LPDWORD dwBytesRead, LPOVERLAPPED lpOverlapped )
{
return ReadFile( hComm, lpbBuffer, dwSize, dwBytesRead, lpOverlapped );
}
BOOL SerialAsync::Read( LPBYTE lpbBuffer, DWORD dwSize, LPDWORD dwBytesRead )
{
BOOL bResult = TRUE;
OVERLAPPED ov;
memset( &ov, 0, sizeof(OVERLAPPED) );
ov.hEvent = CreateEvent(NULL,TRUE,TRUE,NULL);
if( !ReadOverlapped(lpbBuffer,dwSize,dwBytesRead,&ov) )
bResult = GetLastError() == ERROR_IO_PENDING;
if( bResult )
bResult = GetOverlappedResult(&ov,dwBytesRead,TRUE);
CloseHandle( ov.hEvent );
return bResult;
}