delphi编写的虚拟磁盘开发源码分析.doc

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1、.Delphi编写的虚拟磁盘开发源码分析一、虚拟光驱驱动C语言编写1、Vcd文件夹1、DeviceThread.h/设备的处理线程VOIDDeviceThread ( IN PVOID Context );2、DeviceThread.c#include #include #include #include #include #include #include #include #include /NTSTATUSVCDOpenFile ( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp )PDEVICE_EXTENSION device_extensi

2、on;PCHAR filename;UCHAR afile_nameMAX_PATH = 0;UNICODE_STRING ufile_name;NTSTATUS status;OBJECT_ATTRIBUTES object_attributes;FILE_END_OF_FILE_INFORMATION file_eof;FILE_BASIC_INFORMATION file_basic;FILE_STANDARD_INFORMATION file_standard;FILE_ALIGNMENT_INFORMATION file_alignment;DbgPrint(VCDOpenFilen

3、);device_extension = (PDEVICE_EXTENSION) DeviceObject-DeviceExtension;filename = (PCHAR)Irp-AssociatedIrp.SystemBuffer;RtlCopyMemory(device_extension-oldfile_name, filename, MAX_PATH);if (filename0 = )if (filename1 = )/ serversharepath*X.iso -UNCserversharepath*X.isostrcpy(afile_name, UNC);strcat(af

4、ile_name, filename);else/ DeviceHarddisk0Partition1path*X.iso 不变strcpy(afile_name, filename);else/ c:path*X.iso -c:path*X.isostrcpy(afile_name, );strcat(afile_name, filename);device_extension-file_name.Length = (USHORT)strlen(afile_name);device_extension-file_name.MaximumLength = device_extension-fi

5、le_name.Length;device_extension-file_name.Buffer = ExAllocatePool(NonPagedPool, device_extension-file_name.Length);RtlCopyMemory(device_extension-file_name.Buffer,afile_name,device_extension-file_name.Length);status = RtlAnsiStringToUnicodeString(&ufile_name,&device_extension-file_name,TRUE);if (!NT

6、_SUCCESS(status)ExFreePool(device_extension-file_name.Buffer);Irp-IoStatus.Status = status;Irp-IoStatus.Information = 0;return status;InitializeObjectAttributes(&object_attributes,&ufile_name,OBJ_CASE_INSENSITIVE,NULL,NULL);status = ZwCreateFile(&device_extension-file_handle,GENERIC_READ,&object_att

7、ributes,&Irp-IoStatus,NULL,FILE_ATTRIBUTE_NORMAL,FILE_SHARE_READ,FILE_OPEN,FILE_NON_DIRECTORY_FILE | FILE_RANDOM_ACCESS |FILE_NO_INTERMEDIATE_BUFFERING | FILE_SYNCHRONOUS_IO_NONALERT,NULL,0);if (status = STATUS_OBJECT_NAME_NOT_FOUND | status = STATUS_NO_SUCH_FILE)/如果长度是0ExFreePool(device_extension-f

8、ile_name.Buffer);RtlFreeUnicodeString(&ufile_name);Irp-IoStatus.Status = STATUS_NO_SUCH_FILE;Irp-IoStatus.Information = 0;DbgPrint(文件不存在!n);return STATUS_NO_SUCH_FILE;else if (!NT_SUCCESS(status)ExFreePool(device_extension-file_name.Buffer);RtlFreeUnicodeString(&ufile_name);DbgPrint(打开文件失败!n);return

9、 status;RtlFreeUnicodeString(&ufile_name); /获取虚拟光盘文件基础信息status = ZwQueryInformationFile(device_extension-file_handle,&Irp-IoStatus,&file_basic,sizeof(FILE_BASIC_INFORMATION),FileBasicInformation);if (!NT_SUCCESS(status)ExFreePool(device_extension-file_name.Buffer);ZwClose(device_extension-file_handl

10、e);DbgPrint(1获取文件信息失败!n);return status;status = ZwQueryInformationFile(device_extension-file_handle,&Irp-IoStatus,&file_standard,sizeof(FILE_STANDARD_INFORMATION),FileStandardInformation);if (!NT_SUCCESS(status)ExFreePool(device_extension-file_name.Buffer);ZwClose(device_extension-file_handle);DbgPr

11、int(2获取文件信息失败!n);return status;device_extension-file_size.QuadPart = file_standard.EndOfFile.QuadPart; DbgPrint(文件长度%d!n,device_extension-file_size.QuadPart);status = ZwQueryInformationFile(device_extension-file_handle,&Irp-IoStatus,&file_alignment,sizeof(FILE_ALIGNMENT_INFORMATION),FileAlignmentInf

12、ormation);if (!NT_SUCCESS(status)ExFreePool(device_extension-file_name.Buffer);ZwClose(device_extension-file_handle);DbgPrint(3获取文件信息失败!n);return status;DeviceObject-AlignmentRequirement = file_alignment.AlignmentRequirement; /只读 DeviceObject-Characteristics |= FILE_READ_ONLY_DEVICE;/媒体在光驱device_extension-media_in_device = TRUE;Irp-IoStatus.Status = STATUS_SUCCESS;Irp-IoStatus.Information = 0;return STATUS_SUCCESS;NTSTATUSVCDCloseFile( IN PDEVICE_OBJECT DeviceObject, IN PIRP