一个基础的驱动问题,在线等,谢谢!

小弟刚刚开始学习写驱动程序.根据书本写了一个测试程序,希望能监控到串口(com2)收到的数据(win98下).结果什么信息也看不到.下面是代码,请各位帮忙看看,是什么地方错了,谢谢!

vxd的名称是port,下面是代码:
// Port - include file for VxD PORT

#include <vtoolscp.h>

#define DEVICE_CLASS PortDevice
#define PORT_DeviceID UNDEFINED_DEVICE_ID
#define PORT_Init_Order UNDEFINED_INIT_ORDER
#define PORT_Major 1
#define PORT_Minor 0
#define COUNT 65535

struct PortStruct{WORD wPort;WORD wVal;BOOL bInput;};
class MyPort : public VIOPort
{
public:
MyPort(WORD port);
~MyPort();
DWORD handler(VMHANDLE hVM,DWORD port,CLIENT_STRUCT *pRegs,DWORD iotype,DWORD outdata);
static int Count;
static PortStruct *pBuffer;
static int Num;
};

class PortDevice : public VDevice
{
public:
PortDevice();
virtual DWORD OnW32DeviceIoControl(PIOCTLPARAMS pDIOCParams);
MyPort *p2F8,*p2F9,*p2FA,*p2FB,*p2FC,*p2FD,*p2FE,*p2FF;
};

class PortVM : public VVirtualMachine
{
public:
PortVM(VMHANDLE hVM);
};

class PortThread : public VThread
{
public:
PortThread(THREADHANDLE hThread);
};

// Port - main module for VxD PORT

#define DEVICE_MAIN
#include "port.h"
Declare_Virtual_Device(PORT)
#undef DEVICE_MAIN

int MyPort::Count;
int MyPort::Num;
PortStruct *MyPort::pBuffer;

MyPort::MyPort(WORD port) : VIOPort(port)
{
if (Num==0) pBuffer=new PortStruct[COUNT];
Num++;
hook();
}

MyPort::~MyPort()
{
Num--;
if (Num==0) delete pBuffer;
}

DWORD MyPort::handler(VMHANDLE hVM,DWORD port,CLIENT_STRUCT *pRegs,DWORD iotype,DWORD outdata)
{
char data;
switch(iotype)
{
case BYTE_INPUT:
pBuffer[Count].wPort=port;
data=_inp(port);
pBuffer[Count].wVal=data;
pBuffer[Count].bInput=true;
if (++Count=COUNT) Count=COUNT;
return data;
case WORD_INPUT:
pBuffer[Count].wPort=port;
data=_inp(port);
pBuffer[Count].wVal=data;
pBuffer[Count].bInput=true;
if (++Count=COUNT) Count=COUNT;
return data;
case BYTE_OUTPUT:
pBuffer[Count].wPort=port;
data=_outp(port,outdata);
pBuffer[Count].wVal=outdata;
pBuffer[Count].bInput=false;
if (++Count>=COUNT) Count=COUNT;
return data;
case WORD_OUTPUT:
pBuffer[Count].wPort=port;
data=_outp(port,outdata);
pBuffer[Count].wVal=outdata;
pBuffer[Count].bInput=false;
if (++Count>=COUNT) Count=COUNT;
return data;
default:
break;
}
return 0;
}

PortDevice::PortDevice()
{
p2F8=p2F9=p2FA=p2FB=p2FC=p2FD=p2FE=p2FF=0;
}

PortVM::PortVM(VMHANDLE hVM) : VVirtualMachine(hVM) {}

PortThread::PortThread(THREADHANDLE hThread) : VThread(hThread) {}

DWORD PortDevice::OnW32DeviceIoControl(PIOCTLPARAMS pDIOCParams)
{
int i;
switch(pDIOCParams->dioc_IOCtlCode)
{
case DIOC_OPEN:
p2F8=new MyPort(0x2F8);
p2F9=new MyPort(0x2F9);
p2FA=new MyPort(0x2FA);
p2FB=new MyPort(0x2FB);
p2FC=new MyPort(0x2FC);
p2FD=new MyPort(0x2FD);
p2FE=new MyPort(0x2FE);
p2FF=new MyPort(0x2FF);
break;
case DIOC_CLOSEHANDLE:
if (p2F8) {delete p2F8;p2F8=0;}
if (p2F9) {delete p2F9;p2F9=0;}
if (p2FA) {delete p2FA;p2FA=0;}
if (p2FB) {delete p2FB;p2FB=0;}
if (p2FC) {delete p2FC;p2FC=0;}
if (p2FD) {delete p2FD;p2FD=0;}
if (p2FE) {delete p2FE;p2FE=0;}
if (p2FF) {delete p2FF;p2FF=0;}
break;
case 111:
int size=pDIOCParams->dioc_cbOutBuf;
size=MyPort::Count<size?MyPort::Count:size;
memcpy(pDIOCParams->dioc_OutBuf,MyPort::pBuffer,size*sizeof(PortStruct));
*pDIOCParams->dioc_bytesret=size;
break;
}
return 0;
}

调用port.vxd的是testport,代码如下:
//testport.h
#define COUNT 65535

struct PortStruct
{
WORD wPort;
WORD wVal;
BOOL bInput;
};
//testport.cpp
#include "conio.h"
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <winioctl.h>
#include "testport.h"

void main()
{
PortStruct *pBuffer=new PortStruct[COUNT];
DWORD nBytes;
HANDLE hVxD;
char ch;

_cprintf("l=Load IOPORT VXD, c=Close IOPORT VXD, x=Exit, Others=Do not load IOPORT VXD\n");
ch=getch();
while (ch!='x')
{
if (ch=='l')
{
if (hVxD!=NULL)
CloseHandle(hVxD);
hVxD=CreateFile("\\\\.\\d:\\port.vxd",0,0,0,OPEN_EXISTING,FILE_FLAG_DELETE_ON_CLOSE,0);
if (hVxD==INVALID_HANDLE_VALUE)
{
printf("Open VxD error:%s",GetLastError());
exit(1);
}
}
if (ch=='c')
{
if (hVxD!=NULL)
CloseHandle(hVxD);
}
if (DeviceIoControl(hVxD,111,NULL,0,(LPVOID) pBuffer,COUNT,&nBytes,0))
{
for (DWORD i=0;i<nBytes;i++)
printf("%3x : %02x , %s\n",(WORD)pBuffer.wPort,(WORD)pBuffer.wVal,pBuffer.bInput?"Input":"Output");
}
_cprintf("l=Load IOPORT VXD, c=Close IOPORT VXD, x=Exit, Others=Do not load IOPORT VXD\n");
ch=getch();
}
}
当我按下'l'的时候,我设断点看,nBytes是0.

对了,刚才忘记说了,我在com2属性中看到的输入/输出范围是02F8-02FF.

你得选中不使用smileys,否则代码没办法看了。

不好分析，只有编译时，根据错误提示逐步分析。
在调用时，借助softice分析。

不好分析，只有编译时，根据错误提示逐步分析。
在调用时，借助softice分析。

我编译port.vxd文件和porttest.exe文件的时候并没有任何error和warning.不过我在debug porttest.exe文件的时候有Loaded 'C:\WINDOWS\SYSTEM\KERNEL32.DLL', no matching symbolic information found.提示.
小弟并不是很明白是什么意思.

这个思路就不对，你又没有Hook端口操作，即使Hook，你还要分析COM口操作，太麻烦，Hook串口驱动会更方便些

建议楼主使用softice来一步一步跟踪！