如何对并口进行读写操作

[moneycao]

最近我在编写一个能对并口进行读写的程序，程序的部分代码如下：
OVERLAPPED overlapped; //OVERLAPPED structure
OVERLAPPED overlappedread;
OVERLAPPED overlappedwrite;
overlapped.Internal=0;
overlapped.InternalHigh=0;
overlapped.Offset=0;
overlapped.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);

HANDLE FHandle = CreateFile( "LPT1",
GENERIC_READ | GENERIC_WRITE,
0, // Not shared
NULL, // No security attributes
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,// asynchronism communication
0
);
if(GetLastError()==0)
{
overlappedwrite.Internal=0;
overlappedwrite.InternalHigh=0;
overlappedwrite.Offset=0;
overlappedwrite.OffsetHigh=0;
overlappedwrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
//这个很重要，不信你可以注释掉，看看结果会怎样。
LPCVOID csp="dgfdfgfd";
LPDWORD nSent;
WriteFile( FHandle,&csp,8,nSent, &overlappedwrite);
}

程序运行到最后一句时出错。请各位帮我找一下原因。

[Hawk_sun]

CreateFile好像有问题， "LPT1"应该写成"\\\\.\\LPT1"