驅動程式 - Windows NT Driver (Legacy) - 使用範例 - Pascal (DDDK) - Handle File IRP - Choose DO_DIRECT_IO


參考資訊：
https://wasm.in/
http://four-f.narod.ru/
https://github.com/steward-fu/ddk
http://www.delphibasics.info/home/delphibasicsprojects/delphidriverdevelopmentkit

main.pas

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unit main;
  
interface
uses
    DDDK;
          
const
    DEV_NAME = '\Device\MyDriver';
    SYM_NAME = '\DosDevices\MyDriver';
          
function _DriverEntry(pMyDriver : PDriverObject; pMyRegistry : PUnicodeString) : NTSTATUS; stdcall;
  
implementation
var
    szBuf : array[0..255] of char;
      
function IrpOpen(pMyDevice : PDeviceObject; pIrp : PIrp) : NTSTATUS; stdcall;
begin
    DbgPrint('IRP_MJ_CREATE', []);
 
    Result := STATUS_SUCCESS;
    pIrp^.IoStatus.Information := 0;
    pIrp^.IoStatus.Status := Result;
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
end;
  
function IrpRead(pMyDevice : PDeviceObject; pIrp : PIrp) : NTSTATUS; stdcall;
var
    len : ULONG;
    dst : PChar;
  
begin
    DbgPrint('IRP_MJ_READ', []);
      
    len := strlen(@szBuf[0]);
    dst := MmGetSystemAddressForMdlSafe(pIrp^.MdlAddress, LowPagePriority);
    memcpy(dst, @szBuf[0], len);
  
    Result := STATUS_SUCCESS;
    pIrp^.IoStatus.Information := len;
    pIrp^.IoStatus.Status := Result;
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
end;
  
function IrpWrite(pMyDevice : PDeviceObject; pIrp : PIrp) : NTSTATUS; stdcall;
var
    len : ULONG;
    src : PChar;
  
begin
    DbgPrint('IRP_MJ_WRITE', []);
  
    src := MmGetSystemAddressForMdlSafe(pIrp^.MdlAddress, LowPagePriority);
    len := MmGetMdlByteCount(pIrp^.MdlAddress);
    memcpy(@szBuf[0], src, len);
    DbgPrint('Buffer: %s, Length: %d', [szBuf, len]);
     
    Result := STATUS_SUCCESS;
    pIrp^.IoStatus.Information := len;
    pIrp^.IoStatus.Status := Result;
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
end;
  
function IrpClose(pMyDevice : PDeviceObject; pIrp : PIrp) : NTSTATUS; stdcall;
begin
    DbgPrint('IRP_MJ_CLOSE', []);
 
    Result := STATUS_SUCCESS;
    pIrp^.IoStatus.Information := 0;
    pIrp^.IoStatus.Status := Result;
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
end;
  
procedure Unload(pMyDriver : PDriverObject); stdcall;
var
    szSymName : TUnicodeString;
  
begin
    RtlInitUnicodeString(@szSymName, SYM_NAME);
    IoDeleteSymbolicLink(@szSymName);
    IoDeleteDevice(pMyDriver^.DeviceObject);
end;
  
function _DriverEntry(pMyDriver : PDriverObject; pMyRegistry : PUnicodeString) : NTSTATUS; stdcall;
var
    szDevName : TUnicodeString;
    szSymName : TUnicodeString;
    pMyDevice : PDeviceObject;
      
begin
    RtlInitUnicodeString(@szDevName, DEV_NAME);
    RtlInitUnicodeString(@szSymName, SYM_NAME);
    Result := IoCreateDevice(pMyDriver, 0, @szDevName, FILE_DEVICE_UNKNOWN, 0, FALSE, pMyDevice);
  
    pMyDriver^.MajorFunction[IRP_MJ_CREATE] := @IrpOpen;
    pMyDriver^.MajorFunction[IRP_MJ_READ]   := @IrpRead;
    pMyDriver^.MajorFunction[IRP_MJ_WRITE]  := @IrpWrite;
    pMyDriver^.MajorFunction[IRP_MJ_CLOSE]  := @IrpClose;
    pMyDriver^.DriverUnload := @Unload;
    pMyDevice^.Flags := pMyDevice^.Flags or DO_DIRECT_IO;
    pMyDevice^.Flags := pMyDevice^.Flags and not DO_DEVICE_INITIALIZING;
    Result := IoCreateSymbolicLink(@szSymName, @szDevName);
end;
end.

完成