WINDOWS CE/MOBILE 流驱动编写

那天在网上还看到有人继承讨论什么流驱动要实现的函数是不是一定要叫做INIT，OPEN什么的，前辍到底是哪来的，等等，于是干脆就翻出来自己当时入门时的一个程序SHARE一下：）
其实你要实现的函数可以看下面的注释，前辍吗是在注册表当中写好的，呵呵。应该是"Prefix"="STR"，然后你就要实现XXX_INIT.
以这个最小的驱动为例子,注释在后面了,
// StringDriver.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"

#include <tchar.h>
#define BUFSIZE 256
WCHAR achBuffer[BUFSIZE];

BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD ul_reason_for_call,
                       LPVOID lpReserved
                   )
{
   switch(ul_reason_for_call)
   {
   case DLL_PROCESS_ATTACH:
       RETAILMSG(1,(TEXT("Strings:DLL_PROCESS_ATTACH/n")));
       return TRUE;
   case DLL_THREAD_ATTACH:
       RETAILMSG(1,(TEXT("Strings:DLL_THREAD_ATTACH/n")));
       break;
   case DLL_THREAD_DETACH:
       RETAILMSG(1,(TEXT("Strings:DLL_THREAD_DETACH/n")));
       break;
   case DLL_PROCESS_DETACH:
       RETAILMSG(1,(TEXT("Strings:DLL_PROCESS_DETACH/n")));
       break;

#ifdef UNDER_CE
   case DLL_PROCESS_EXITING:
       RETAILMSG(1,(TEXT("Strings:DLL_PROCESS_EXITING/n")));
       break;
   case DLL_SYSTEM_STARTED:
       RETAILMSG(1,(TEXT("Strings:DLL_SYSTEM_STARTED/n")));
       break;
#endif
   }
    return TRUE;
}
//此上的代码没什么大用.
//导出各符号
STRINGDRIVERDLL_API DWORD STR_Init(DWORD dwContext);
STRINGDRIVERDLL_API BOOL STR_Deinit(DWORD hDeviceConext);
STRINGDRIVERDLL_API DWORD STR_Open(DWORD hDeviceContext,DWORD AccessCode,DWORD ShareMode);
STRINGDRIVERDLL_API BOOL STR_Close(DWORD hOpenContext);
STRINGDRIVERDLL_API BOOL STR_IOControl(DWORD hOpenContext,DWORD swCode,PBYTE pBufIn,DWORD dwLenIn,PBYTE pBufOut,DWORD dwLenOut,PDWORD pdwActualOut);
STRINGDRIVERDLL_API void STR_PowerDown(DWORD hDeviceContext);
STRINGDRIVERDLL_API void STR_PowerUp(DWORD hDeviceContext);
STRINGDRIVERDLL_API DWORD STR_Read(DWORD hOpenContext,LPVOID pBuffer,DWORD Count);
STRINGDRIVERDLL_API DWORD STR_Seek(DWORD hOpenContext,long Amount,DWORD Type);
STRINGDRIVERDLL_API DWORD STR_Write(DWORD hOpenContext,LPVOID pSourceBytes,DWORD NumberOfBytes);

//以下为驱动各个派遣例程函数

STRINGDRIVERDLL_API DWORD STR_Init(DWORD dwContext)
{
   DWORD dwRet=0;
   RETAILMSG(1,(TEXT("Strings:STR_Init/n")));

   //初始化驱动程序
   memset(achBuffer,0,BUFSIZE*sizeof(WCHAR));
   //返回一个不为0的数
   dwRet=1;
   return dwRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API BOOL STR_Deinit(DWORD hDeviceConext)
{
   与INIT相对泻载函数
    BOOL bRet=TRUE;
   RETAILMSG(1,(TEXT("Strings:STR_Deinit/n")));
   return bRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API DWORD STR_Open(DWORD hDeviceContext,DWORD AccessCode,DWORD ShareMode)
{
   DWORD dwRet=0;
   RETAILMSG(1,(TEXT("Strings:STR_Open/n")));
   //一个要返回一个非空的噢,非常谁调他谁就ACEESS DENY了:)
   dwRet=1;
   return dwRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API BOOL STR_Close(DWORD hOpenContext)
{
   BOOL bRet=TRUE;
//这个可不是缺载啊,是关闭!
   RETAILMSG(1,(TEXT("Strings:STR_Close/n")));
   return bRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API BOOL STR_IOControl(DWORD hOpenContext,DWORD swCode,PBYTE pBufIn,DWORD dwLenIn,PBYTE pBufOut,DWORD dwLenOut,PDWORD pdwActualOut)
{
   BOOL bRet=TRUE;
   RETAILMSG(1,(TEXT("Strings:STR_IOControl/n")));
   return bRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API void STR_PowerDown(DWORD hDeviceContext)
{
   RETAILMSG(1,(TEXT("Strings:STR_PowerDown/n")));
   // 当这个设备断电了,系统会通知
}

//---------------------------------------------------------
STRINGDRIVERDLL_API void STR_PowerUp(DWORD hDeviceContext)
{
   RETAILMSG(1,(TEXT("Strings:STR_PowerUp/n")));
}

//---------------------------------------------------------
STRINGDRIVERDLL_API DWORD STR_Read(DWORD hOpenContext,LPVOID pBuffer,DWORD Count)
{
   DWORD dwRet=0;
   RETAILMSG(1,(TEXT("Strings:STR_Read/n")));
   //确定实际要读取的字节的大小并读取数据
   DWORD cbBuffer=wcslen(achBuffer);
   dwRet=min(cbBuffer,Count);
   wcsncpy((LPWSTR)pBuffer,achBuffer,dwRet);
   //返回实际读取的字节数
   return dwRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API DWORD STR_Seek(DWORD hOpenContext,long Amount,DWORD Type)
{
   DWORD dwRet=0;
   RETAILMSG(1,(TEXT("Strings:STR_Seek/n")));
   return dwRet;
}

//---------------------------------------------------------
STRINGDRIVERDLL_API DWORD STR_Write(DWORD hOpenContext,LPVOID pSourceBytes,DWORD NumberOfBytes)
{
   DWORD dw
Ret=0;
   RETAILMSG(1,(TEXT("Strings:STR_Write/n")));

   //确定实际要写入字节的大小，写入数据
   dwRet=min(BUFSIZE,NumberOfBytes);
   wcsncpy(achBuffer,(LPWSTR)pSourceBytes,dwRet);

   //返回实际写入的字节数
   return dwRet;
}