wince下串口通信问题
大家看下面串口写程序有问题吗?
为什么只能每次写入一个字符 却不能写入字符串??
::WriteComm(char *buf, DWORD dwLength)
{
BOOL fState;
DWORD length=dwLength;
COMSTAT comstat;
DWORD dwErrorFlags;
ClearCommError(m_hCom, &dwErrorFlags, &comstat);
fState=WriteFile(m_hCom, buf, length, &length, NULL);
if(fState) m_str="true";
else m_str="false";
return length;
}