www.pudn.com > windows2000XP_WDM_DeviceDriverDevelopment_WuAnHe_C > CharFilter.cpp

// CharFilter.cpp 
// 
// Generated by DriverWizard version DriverStudio 3.1.0 (Build 1722) 
// Requires Compuware's DriverWorks classes 
// 
 
#define VDW_MAIN 
 
#include  
#include "CharFilter.h" 
#include "CharFilterDevice.h" 
 
#pragma hdrstop("CharFilter.pch") 
 
// Generated by DriverWizard version DriverStudio 3.1.0 (Build 1722) 
 
// Set a default 32-bit tag value to be stored with each heap block 
// allocated by operator new. Use BoundsChecker to view the memory pool. 
// This value can be overridden using the global function SetPoolTag(). 
POOLTAG DefaultPoolTag('rahC'); 
 
///////////////////////////////////////////////////////////////////// 
// Begin INIT section 
#pragma code_seg("INIT") 
 
DECLARE_DRIVER_CLASS(CharFilter, NULL) 
///////////////////////////////////////////////////////////////////// 
//  CharFilter::DriverEntry 
// 
//	Routine Description: 
//		This is the first entry point called by the system when the 
//		driver is loaded. 
//  
//	Parameters: 
//		RegistryPath - String used to find driver parameters in the 
//			registry.  To locate CharFilter look for: 
//			HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CharFilter 
// 
//	Return Value: 
//		NTSTATUS - Return STATUS_SUCCESS if no errors are encountered. 
//			Any other indicates to the system that an error has occured. 
// 
//	Comments: 
// 
 
NTSTATUS CharFilter::DriverEntry(PUNICODE_STRING RegistryPath) 
{ 
 
	// The following macro simply allows compilation at Warning Level 4 
	// If you reference this parameter in the function simply remove the macro. 
	UNREFERENCED_PARAMETER(RegistryPath); 
 
	m_Unit = 0; 
	return STATUS_SUCCESS; 
} 
 
// End INIT section 
///////////////////////////////////////////////////////////////////// 
#pragma code_seg() 
 
///////////////////////////////////////////////////////////////////// 
//  CharFilter::AddDevice 
// 
//	Routine Description: 
//		Called when the system detects a device for which this 
//		driver is responsible. 
// 
//	Parameters: 
//		Pdo - Physical Device Object. This is a pointer to a system device 
//			object that represents the physical device. 
// 
//	Return Value: 
//		NTSTATUS - Success or failure code. 
// 
//	Comments: 
//		This function creates the Functional Device Object, or FDO. The FDO 
//		enables this driver to handle requests for the physical device.  
// 
NTSTATUS CharFilter::AddDevice(PDEVICE_OBJECT Pdo) 
{ 
 
    // Create the device object. Note that we used a form of "placement" new, 
	// that is a member operator of KDevice.  This form will use storage 
	// allocated by the system in the device object's device to store our 
	// class instance. 
	CharFilterDevice * pDevice = new ( 
			NULL, 
			FILE_DEVICE_UNKNOWN, 
			NULL, 
			0, 
			DO_DIRECT_IO 
				| DO_POWER_PAGABLE 
			) 
		CharFilterDevice(Pdo, m_Unit); 
 
	if (pDevice == NULL) 
	{ 
	    return STATUS_INSUFFICIENT_RESOURCES; 
	} 
 
	NTSTATUS status = pDevice->ConstructorStatus(); 
 
	if ( !NT_SUCCESS(status) ) 
	{ 
		delete pDevice; 
	} 
	else 
	{ 
		m_Unit++; 
 
		pDevice->ReportNewDevicePowerState(PowerDeviceD0); 
	} 
 
	return status; 
} 
 
// EOF