Windows NT Driver >> Pascal

StartIO

---

參考資訊：
1. Source Code
2. delphidriverdevelopmentkit

StartIO提供一個序列化的機制，讓使用者可以依照順序處理IRP，這個機制對於某些只能序列執行的硬體相當有幫助，省去用軟體實現序列化的程式碼，使用的步驟：
1. IoMarkIrpPending()
2. IoStartNextPacket()

main.pas

unit main;

interface
  uses 
    DDDK;

  const 
    DEV_NAME = '\Device\MyDriver';
    SYM_NAME = '\DosDevices\MyDriver';
    
  function _DriverEntry(pOurDriver:PDriverObject; pOurRegistry:PUnicodeString):NTSTATUS; stdcall;

implementation
var
  szBuf: array[0..255] of char;
  
function IrpOpen(pOurDevice: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(pOurDevice:PDeviceObject; pIrp:PIrp):NTSTATUS; stdcall;
begin
  DbgPrint('IrpFile, IRP_MJ_READ', []);
  
  IoMarkIrpPending(pIrp);
  IoStartPacket(pOurDevice, pIrp, Nil, Nil);
  Result:= STATUS_PENDING;
end;

function IrpWrite(pOurDevice:PDeviceObject; pIrp:PIrp):NTSTATUS; stdcall;
begin
  DbgPrint('IrpFile, IRP_MJ_WRITE', []);
  
  IoMarkIrpPending(pIrp);
  IoStartPacket(pOurDevice, pIrp, Nil, Nil);
  Result:= STATUS_PENDING;
end;

function IrpClose(pOurDevice: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;

function StartIo(pOurDevice:PDeviceObject; pIrp:PIrp):NTSTATUS; stdcall;
var
  len: ULONG;
  psk: PIoStackLocation;
  
begin
  len:= 0;
  psk:= IoGetCurrentIrpStackLocation(pIrp);
  if psk^.MajorFunction = IRP_MJ_WRITE then
  begin
    DbgPrint('StartIo, IRP_MJ_WRITE', []);
    len:= psk.Parameters.Write.Length;
    memcpy(@szBuf[0], pIrp^.AssociatedIrp.SystemBuffer, len);
    DbgPrint('Buffer: %s, Length: %d', [szBuf, len]);
  end
  else if psk^.MajorFunction = IRP_MJ_READ then
  begin
    DbgPrint('StartIo, IRP_MJ_READ', []);
    len:= strlen(@szBuf[0])+1;
    memcpy(pIrp^.AssociatedIrp.SystemBuffer, @szBuf[0], len);
  end;
  
  Result:= STATUS_SUCCESS;
  pIrp^.IoStatus.Information:= len;
  pIrp^.IoStatus.Status:= Result;
  IoCompleteRequest(pIrp, IO_NO_INCREMENT);
  IoStartNextPacket(pOurDevice, FALSE);
end;

procedure Unload(pOurDriver:PDriverObject); stdcall;
var
  szSymName: TUnicodeString;

begin
  RtlInitUnicodeString(@szSymName, SYM_NAME);
  IoDeleteSymbolicLink(@szSymName);
  IoDeleteDevice(pOurDriver^.DeviceObject);
end;

function _DriverEntry(pOurDriver:PDriverObject; pOurRegistry:PUnicodeString):NTSTATUS; stdcall;
var
  suDevName: TUnicodeString;
  szSymName: TUnicodeString;
  pOurDevice: PDeviceObject;
  
begin
  RtlInitUnicodeString(@suDevName, DEV_NAME);
  RtlInitUnicodeString(@szSymName, SYM_NAME);
  Result:= IoCreateDevice(pOurDriver, 0, @suDevName, FILE_DEVICE_UNKNOWN, 0, FALSE, pOurDevice);

  if NT_SUCCESS(Result) then
  begin
    pOurDriver^.MajorFunction[IRP_MJ_CREATE]:= @IrpOpen;
    pOurDriver^.MajorFunction[IRP_MJ_READ]  := @IrpRead;
    pOurDriver^.MajorFunction[IRP_MJ_WRITE] := @IrpWrite;
    pOurDriver^.MajorFunction[IRP_MJ_CLOSE] := @IrpClose;
    pOurDriver^.DriverStartIo := @StartIo;
    pOurDriver^.DriverUnload := @Unload;
    pOurDevice^.Flags:= pOurDevice^.Flags or DO_BUFFERED_IO;
    pOurDevice^.Flags:= pOurDevice^.Flags and not DO_DEVICE_INITIALIZING;
    Result:= IoCreateSymbolicLink(@szSymName, @suDevName);
  end;
end;
end.

IrpFile()IRP_MJ_READ和IRP_MJ_WRITE使用StartIO方式處理

app.pas

program main;

{$APPTYPE CONSOLE}

uses
  Windows,
  Messages,
  SysUtils,
  Variants,
  Classes,
  Graphics,
  Controls,
  Forms,
  DIALOGS;

var
  fd: DWORD;
  ret: DWORD;
  len: DWORD;
  szBuf: array[0..255] of char;
begin
  fd:= CreateFile('\\.\MyDriver', GENERIC_READ or GENERIC_WRITE, FILE_SHARE_READ, Nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  if (fd <> INVALID_HANDLE_VALUE) then
  begin
    StrCopy(szBuf, 'I am error');
    len:= strlen(szBuf)+1;
    WriteLn(Output, Format('WR: %s', [szBuf]));
    WriteLn(Output, Format('Length: %d', [len]));
    WriteFile(fd, szBuf, len, ret, Nil);
    ReadFile(fd, szBuf, len, ret, Nil);
    WriteLn(Output, Format('RD: %s', [szBuf]));
    WriteLn(Output, Format('Length: %d', [ret]));
    CloseHandle(fd);
  end else
  begin
    WriteLn(Output, 'failed to open mydriver');
  end;
end.

結果

返回上一頁