串口过滤驱动源码

注意IRP_MJ_WRITE和IRP_MJ_READ处理方式，两者有很大的不同：

 

 /************************************************************************* 函数名称:HelloDDKDispatchRoutine* 功能描述:对读IRP进行处理* 参数列表: pDevObj:功能设备对象 pIrp:从IO请求包* 返回 值:返回状态*************************************************************************/#pragma PAGEDCODENTSTATUS HelloDDKDispatchRoutine(IN PDEVICE_OBJECT pDevObj, IN PIRP pIrp) {UNICODE_STRING unicodeString={0};ANSI_STRING ansiString={0};ULONG j;NTSTATUS status = STATUS_SUCCESS;PIO_STACK_LOCATION Irpsp = IoGetCurrentIrpStackLocation(pIrp);PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)pDevObj->DeviceExtension;if( pDevExt && pDevExt->pDevice==pDevObj){// 完成IRPpIrp->IoStatus.Status = status;pIrp->IoStatus.Information = 0;// bytes xferedIoCompleteRequest( pIrp, IO_NO_INCREMENT );KdPrint(("Leave HelloDDKDispatchRoutine/n"));return status;}if (Irpsp->MajorFunction == IRP_MJ_POWER){ KdPrint(("HelloDDKDispatchRoutine IRP_MJ_POWER /n")); PoStartNextPowerIrp(pIrp); IoSkipCurrentIrpStackLocation(pIrp); return PoCallDriver(realDevObj, pIrp); //调用真实设备}else if (Irpsp->MajorFunction == IRP_MJ_WRITE){ULONG uLen = Irpsp->Parameters.Write.Length; //获取写入的长度PUCHAR pBuf = NULL; if (pIrp->MdlAddress != NULL) pBuf = (PUCHAR)MmGetSystemAddressForMdlSafe (pIrp->MdlAddress , NormalPagePriority);else pBuf = (PUCHAR)pIrp->UserBuffer;if(pBuf == NULL) pBuf = (PUCHAR)pIrp->AssociatedIrp.SystemBuffer; //for (j = 0 ; j < uLen ; j++)// KdPrint(("comcap : SendData : %c/r/n" , pBuf[j])); KdPrint(("IRP_MJ_WRITE : len %d : SendData(S): %s/n",uLen,pBuf));gdata.uType = IRP_MJ_WRITE; RtlCopyMemory(gdata.message,pBuf,uLen);gdata.len = uLen;KeSetEvent(gEvent,IO_NO_INCREMENT,FALSE);}else if (Irpsp->MajorFunction == IRP_MJ_CREATE){KdPrint(("HelloDDKDispatchRoutine IRP_MJ_CREATE /n"));}else if (Irpsp->MajorFunction == IRP_MJ_READ){KdPrint(("HelloDDKDispatchRoutine IRP_MJ_READ /n"));IoSkipCurrentIrpStackLocation(pIrp);IoSetCompletionRoutine(pIrp,fengReadComplete,pDevObj,TRUE,TRUE,TRUE);return IoCallDriver(realDevObj,pIrp);//写文件//ZwWriteFile(hfile,NULL,NULL,NULL,&iostatus,pBuffer,BUFFER_SIZE,NULL,NULL);}else if (Irpsp->MajorFunction == IRP_MJ_CLOSE){KdPrint(("HelloDDKDispatchRoutine IRP_MJ_CLOSE /n"));}IoSkipCurrentIrpStackLocation(pIrp);return IoCallDriver(realDevObj,pIrp);}#pragma PAGEDCODENTSTATUS fengReadComplete(IN PDEVICE_OBJECT DeviectObject, IN PIRP Irp, IN PVOID Context){PIO_STACK_LOCATION Irpsp; ULONG i; if( Irp->PendingReturned) IoMarkIrpPending( Irp); Irpsp = IoGetCurrentIrpStackLocation(Irp); if(NT_SUCCESS( Irp->IoStatus.Status)) { //读成功才处理 ULONG uLen = Irp->IoStatus.Information; //获取写入的长度 PUCHAR pBuf = NULL;pBuf = (PUCHAR)Irp->AssociatedIrp.SystemBuffer;KdPrint(("IRP_MJ_READ : len %d SendData: %s/n",uLen,pBuf)); gdata.uType = IRP_MJ_READ;RtlCopyMemory(gdata.message,pBuf,uLen);gdata.len = uLen;KeSetEvent(gEvent,IO_NO_INCREMENT,FALSE); } return Irp->IoStatus.Status;}#pragma PAGEDCODENTSTATUS HelloDDKDeviceIoControl(IN PDEVICE_OBJECT pDevObj, IN PIRP pIrp) {NTSTATUS status = STATUS_SUCCESS;PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)pDevObj->DeviceExtension;PIO_STACK_LOCATION Irpsp = IoGetCurrentIrpStackLocation(pIrp);KdPrint(("Enter HelloDDKDeviceIoControl/n"));ULONG cbin=Irpsp->Parameters.DeviceIoControl.InputBufferLength;ULONG cbOut=Irpsp->Parameters.DeviceIoControl.OutputBufferLength;ULONG code=Irpsp->Parameters.DeviceIoControl.IoControlCode;if( pDevExt && pDevExt->pDevice==pDevObj){if( code == IOCTL_SET_EVENT ){HANDLE hUserEvent= *(HANDLE*) pIrp->AssociatedIrp.SystemBuffer;//PKEVENT pEvent;ObReferenceObjectByHandle(hUserEvent,EVENT_MODIFY_STATE,*ExEventObjectType,KernelMode,(PVOID*)&gEvent,NULL);//gEvent=pEvent;KdPrint(("DeviceIoControl IOCTL_SET_EVENT /n"));pIrp->IoStatus.Information = 0;// bytes xfered//KeSetEvent(pEvent,IO_NO_INCREMENT,FALSE);//ObDereferenceObject(pEvent);}else if( code == IOCTL_GET_SERIAL_MESSAGE ){REQUEST *pdate=(REQUEST*)pIrp->AssociatedIrp.SystemBuffer;pdate->len = gdata.len;pdate->uType = gdata.uType;//pdate->message = gdata.message;RtlCopyMemory(pdate->message,gdata.message,gdata.len);pIrp->IoStatus.Information=sizeof(REQUEST);}// 完成IRPpIrp->IoStatus.Status = status;IoCompleteRequest( pIrp, IO_NO_INCREMENT );KdPrint(("Leave HelloDDKDeviceIoControl/n"));return status;}if(Irpsp->MajorFunction == IOCTL_SERIAL_GET_BAUD_RATE){KdPrint(("DeviceIoControl target is serial /n"));}IoSkipCurrentIrpStackLocation(pIrp);return IoCallDriver(realDevObj,pIrp);}

 

HelloDDKDeviceIoControl 例程是用来同应用层通讯，传递实时数据