驱动开发之五 --- TDI之五【译文】

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转自http://hi.baidu.com/combojiang/blog/item/854e66314a51adad5edf0ec6.html

步骤5：发送和接收数据

为了发送数据，你只需创建一个TDI_SEND IOCTL，然后把它传送给传输设备。下面的代码实现了数据发送。

NTSTATUS TdiFuncs_Send(PFILE_OBJECT pfoConnection, PVOID pData,

UINT uiSendLength, UINT *pDataSent)

{

NTSTATUS NtStatus = STATUS_INSUFFICIENT_RESOURCES;

PIRP pIrp;

IO_STATUS_BLOCK IoStatusBlock = {0};

PDEVICE_OBJECT pTdiDevice;

PMDL pSendMdl;

TDI_COMPLETION_CONTEXT TdiCompletionContext;

KeInitializeEvent(&TdiCompletionContext.kCompleteEvent,

NotificationEvent, FALSE);

* The TDI Device Object is required to

* send these requests to the TDI Driver.

pTdiDevice = IoGetRelatedDeviceObject(pfoConnection);

*pDataSent = 0;

* The send requires an MDL which is what you may remember from DIRECT_IO.

* However, instead of using an MDL we need to create one.

pSendMdl = IoAllocateMdl((PCHAR )pData, uiSendLength, FALSE, FALSE, NULL);

if(pSendMdl)

{

__try {

MmProbeAndLockPages(pSendMdl, KernelMode, IoModifyAccess);

} __except (EXCEPTION_EXECUTE_HANDLER) {

IoFreeMdl(pSendMdl);

pSendMdl = NULL;

};

if(pSendMdl)

{

* Step 1: Build the IRP. TDI defines several macros and functions

* that can quickly create IRP's, etc. for variuos purposes.

* While this can be done manually it's easiest to use

* the macros.

pIrp = TdiBuildInternalDeviceControlIrp(TDI_SEND,

pTdiDevice, pfoConnection,

&TdiCompletionContext.kCompleteEvent,

&IoStatusBlock);

if(pIrp)

{

* Step 2: Add the correct parameters into the IRP.

TdiBuildSend(pIrp, pTdiDevice, pfoConnection, NULL,

NULL, pSendMdl, 0, uiSendLength);

NtStatus = IoCallDriver(pTdiDevice, pIrp);

* If the status returned is STATUS_PENDING this means that the

* IRP will not be completed synchronously and the driver has

* queued the IRP for later processing. This is fine but we do

* not want to return this not want to return this not want to

* return this to wait until it has completed. The EVENT

* that we providedwill be set when the IRP completes.

if(NtStatus == STATUS_PENDING)

{

KeWaitForSingleObject(&TdiCompletionContext.kCompleteEvent,

Executive, KernelMode, FALSE, NULL);

}

NtStatus = IoStatusBlock.Status;

*pDataSent = (UINT)IoStatusBlock.Information;

* I/O Manager will free the MDL

if(pSendMdl)

{

MmUnlockPages(pSendMdl);

IoFreeMdl(pSendMdl);

} */

}

return NtStatus;

}

posted on 2009-03-23 22:07 iniwf 阅读(277) 评论(0) 编辑收藏引用所属分类: 驱动

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