驱动开发与系统原理-文件操作-读取文件

大理寺少卿

代码全贴太长了，就贴一下操作的地方

3环代码

     #define CTL_READ_PATH IRP_IOCTRL_CODE(3)
     ....
        case'3':
        {
            RetNumber = 0;
            memset(InputBuffer, 0, sizeof(InputBuffer));
            memset(OutputBuffer, 0, sizeof(OutputBuffer));
            printf("请输入需要读取数据的文件路径：\n");
            scanf("%s", InputBuffer); 
            DeviceIoControl(hDriver, CTL_READ_PATH, InputBuffer, sizeof(InputBuffer), OutputBuffer, sizeof(OutputBuffer), &RetNumber, NULL);
            printf("读取数据:%s\n", OutputBuffer);
            system("pause");
            break;
        }

0环代码

    #define CTL_READ_PATH IRP_IOCTRL_CODE(3)

    //缓冲区
    char g_Buffer[0x1024] = { 0 };

        NTSTATUS ReadFileIoCall(char* filePath)  {
            //1.打开文件，获取文件句柄
            //2.获取文件长度
            //3.全部读入

            //状态码
            NTSTATUS ntSTATUS = STATUS_SUCCESS;
            //文件句柄 
            HANDLE hFile = NULL;
            //文件属性结构体，集合文件的信息
            FILE_STANDARD_INFORMATION fsi = { 0 };

            //完成状态
            IO_STATUS_BLOCK Iostatus = { 0 };
            //对象属性
            OBJECT_ATTRIBUTES ObjectAtt = { 0 };
            //三环c:\a.txt
            //0环:\\??\\c:\a.txt
            //将三环路径转换成驱动使用的路径
            ANSI_STRING asFilePath = { 0 };
            UNICODE_STRING usFilePath = { 0 };
            UNICODE_STRING usDriverFilePath = { 0 };
            UNICODE_STRING usDrvPath = { 0 };
            WCHAR  wcBuffer[256];
            ULONG wcbufferLen = 256 * sizeof(WCHAR);
            RtlInitEmptyUnicodeString(&usDrvPath, &wcBuffer, wcbufferLen);
            RtlInitUnicodeString(&usDriverFilePath, L"\\??\\");
            RtlInitAnsiString(&asFilePath, filePath);
            RtlAnsiStringToUnicodeString(&usFilePath, &asFilePath, TRUE);
            RtlAppendUnicodeStringToString(&usDrvPath, &usDriverFilePath);
            RtlAppendUnicodeStringToString(&usDrvPath, &usFilePath);
            RtlFreeUnicodeString(&usFilePath);
            //初始化对象
            InitializeObjectAttributes(&ObjectAtt, &usDrvPath, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
            //打开文件并判断
            ntSTATUS = ZwCreateFile(&hFile, GENERIC_WRITE, &ObjectAtt, &Iostatus, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_WRITE, FILE_OPEN_IF, FILE_SYNCHRONOUS_IO_NONALERT, NULL, 0);
            if (!NT_SUCCESS(ntSTATUS))
            {
                return ntSTATUS;
            }
            //返回各种有关文件对象的信息
            ntSTATUS = ZwQueryInformationFile(hFile, &Iostatus, &fsi, sizeof(FILE_STANDARD_INFORMATION), FileStandardInformation);
            if (!NT_SUCCESS(ntSTATUS))
            {
                return ntSTATUS;
            }
            memset(g_Buffer, 0, sizeof(g_Buffer));
            //读取文件
            ntSTATUS = ZwReadFile(hFile, NULL, NULL, NULL, &Iostatus, g_Buffer, fsi.EndOfFile.QuadPart, NULL, NULL);
            ZwClose(hFile);
            return ntSTATUS;
        }

        ...
        ...
        case CTL_READ_PATH:
        {
            ntStatus = ReadFileIoCall(pInputBuffer);
            if (NT_SUCCESS(ntStatus))
            {
                RtlZeroMemory(pOutputBuffer, 1024);
                ULONG uRetlength = strlen(g_Buffer);
                RtlCopyMemory(pOutputBuffer, g_Buffer, uRetlength);
                pIrp->IoStatus.Status = STATUS_SUCCESS;
                pIrp->IoStatus.Information = uRetlength;
                IoCompleteRequest(pIrp, IO_NO_INCREMENT);
            }
            else {
                RtlZeroMemory(pOutputBuffer, 1024);
                ULONG uRetlength = strlen("Read Failed!");
                RtlCopyMemory(pOutputBuffer, "Read Failed!", uRetlength);
                pIrp->IoStatus.Status = STATUS_SUCCESS;
                pIrp->IoStatus.Information = uRetlength;
                IoCompleteRequest(pIrp, IO_NO_INCREMENT);

            }
            return STATUS_SUCCESS;
        }