WinCE6.0下OEMIOControl的实现
IOCTL_HAL_GET_CACHE_INFO
IOCTL_HAL_GET_DEVICE_INFO
IOCTL_HAL_GET_DEVICEID
IOCTL_HAL_GET_UUID
IOCTL_PROCESSOR_INFORMATION
如果用户在应用程序中试图访问其他的case，肯定会返回失败的。在WinCE6.0中，驱动程序还像以前一样，可以访问OEMIoControl中的任何 case。那么我们如何让应用程序也访问到一些自己添加的case呢？以下以我IOCTL_HAL_GET_MAP_CODE为例，详细讲解如何添加自定义的case给应用程序调用：
1. %(_WINCEROOT)\PUBLIC\COMMON\OAK\INC\pkfuncs.h 添加要设置的IOCTL：
#define IOCTL_SET_KERNEL_COMM_DEV CTL_CODE(FILE_DEVICE_HAL, 12, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_HAL_GET_UUID CTL_CODE(FILE_DEVICE_HAL, 13, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_HAL_GET_MAP_CODE CTL_CODE(FILE_DEVICE_HAL,2075,METHOD_BUFFERED,FILE_ANY_ACCESS)
2. 到OAL 层的oalioctl.cpp 里添加我们定义的IOCTL ：
EXTERN_C
BOOL
IOControl(
DWORD dwIoControlCode,
PBYTE pInBuf,
DWORD nInBufSize,
PBYTE pOutBuf,
DWORD nOutBufSize,
PDWORD pBytesReturned
)
{
BOOL fRet = FALSE;
//
// By default the following ioctls are supported for user mode threads.
// If a new ioctl is being added to this list, make sure the corresponding
// data associated with that ioctl is marshalled properly to the OAL
// ioctl implementation. In normal cases, one doesn't need any
// marshaling as first level user specified buffers are already validated
// by kernel that:
// -- the buffers are within the user process space
// Check out IsValidUsrPtr() function in vmlayout.h for details on kernel
// validation of user specified buffers. Kernel doesn't validate that the
// buffers are accessible; it only checks that the buffer start and end
// addresses are within the user process space.
//
switch (dwIoControlCode)
{
case IOCTL_HAL_GET_CACHE_INFO:
case IOCTL_HAL_GET_DEVICE_INFO:
case IOCTL_HAL_GET_DEVICEID:
case IOCTL_HAL_GET_UUID:
case IOCTL_HAL_GET_MAP_CODE: //Andy
case IOCTL_HAL_REBOOT:
// request is to service the ioctl - forward the call to OAL code
// OAL code will set the last error if there is a failure
fRet = (*g_pfnExtOALIoctl)(dwIoControlCode, pInBuf, nInBufSize, pOutBuf, nOutBufSize, pBytesReturned);
break;
default:
SetLastError(ERROR_NOT_SUPPORTED);
break;
}
return fRet;
}
这些IOCTL 都是应用程序可以调用的；
3.%(_WINCEROOT)\PLATFORM\COMMON\SRC\INC\oal_ioctl_tab.h 添加 IOCTL 对应的函数：
{ IOCTL_HAL_GET_MAP_CODE, 0, OALIoCtlHalGetMapCode }, //Andy
4. %(_WINCEROOT)\PLATFORM\COMMON\SRC\INC\oal_ioctl.h 添加函数声明：
BOOL OALIoCtlHalGetMapCode(UINT32, VOID *, UINT32, VOID *, UINT32, UINT32 *); //Andy
5. %(_WINCEROOT)\PLATFORM\COMMON\SRC\COMMON\IOCTL\mapcode.c 添加函数定义：
//------------------------------------------------------------------------------
//
// Function: OALIoCtlHalGetMapCode
//
// Implements the IOCTL_HAL_GET_MAP_CODE handler. This function fills in a
// GUID structure.
//
BOOL OALIoCtlHalGetMapCode(
UINT32 code,
VOID *pInpBuffer,
UINT32 inpSize,
VOID *pOutBuffer,
UINT32 outSize,
UINT32 *pOutSize
)
{
…(具体实现省略）
return rc;
}
这样就完成了该功能的添加。
（声明：该文章是在网络相关文章的基础上，修改了错误，更换了示例而成。因原文章被抄来抄去，已经没办法找到原著者，因此，此处没办法表明，请谅解。）