Delphi中的Delphi HID和Delphi XE2

Question

我在Delphi 7中制作了一个小程序来显示所有连接的HID设备的一些细节。 我只使用了SetupAPI ， Moduleloader和HID.pas等系统文件。 这很完美。 当我使用相同的代码并在Delphi XE2或（2010年）中编译它时，它无法生成所需的输出。

可能这与指针转换有关，但我无法找到根本原因。

谁能帮忙。

这是我的代码：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, 
  Graphics, Controls, Forms, Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

Uses 
  SetUpAPI, HID;

{$R *.dfm}

Type
  THIDUSBDeviceInfo = Record   { contains interface level information of each device}
    SymLink            : String;
    BufferSize         : Word;
    Handle             : THandle;
    VID                : DWord;
    PID                : DWord;
    VersionNumber      : Word;
    ManufacturerString : String;
    ProductString      : String;
    SerialNumberString : String;
  end;
  THIDDeviceList = Array of THIDUSBDeviceInfo;

Const
  HIDUSB_COUNTOFINTERRUPTBUFFERS = 64;   // Count of buffers for interrupt data


Procedure ScanForHIDdevices( Var DeviceList : THIDDeviceList;
    TargetVID, TargetPID  : DWord);
Var
  HID_GUIid     : TGUID;
  spdid        : TSPDeviceInterfaceData;
  pSpDidd      : PSPDEVICEINTERFACEDETAILDATAA;
  spddd        : TSPDevInfoData;
  HIDinfo       : HDEVINFO;
  CurIdx       : Integer;
  dwSize       : DWord;
  SymbolicLink : String;
  DevHandle    : THandle;
  HidAttrs     : THIDDAttributes;
  FoundIdx     : Integer;
  Info         : THIDUSBDeviceInfo;

  Function GetHidDeviceInfo( Symlink : PChar) : THIDUSBDeviceInfo;
  Var
    pstr          : pWideChar;
    preparsedData : PHIDPPreparsedData;
    hidCaps       : THIDPCaps;
  Begin
    FillChar(Result, SizeOf( Result), 0);
    Result.SymLink := SymLink+ #0;
    GetMem( pstr, 512);
    DevHandle := CreateFile( Symlink,
                             GENERIC_READ or GENERIC_WRITE,
                             FILE_SHARE_READ or FILE_SHARE_WRITE,
                             nil,
                             OPEN_EXISTING,
                             0,
                             0);
    If DevHandle <> INVALID_HANDLE_VALUE then
    begin
      If HidD_GetAttributes( DevHandle,
                             HidAttrs) then
      begin
        result.VID           := HidAttrs.VendorID;
        result.PID           := HidAttrs.ProductID;
        result.VersionNumber := HidAttrs.VersionNumber;
      end;

      If HidD_GetManufacturerString( DevHandle, pstr, 512) then 
        Result.ManufacturerString := pStr;

      If HidD_GetProductString( DevHandle, pstr, 512) then 
        Result.ProductString := pStr;

      If HidD_GetSerialNumberString( DevHandle, pstr, 512) then 
        Result.SerialNumberString := pStr;

      { Set Input buffer size }
      HidD_SetNumInputBuffers( DevHandle,
                               HIDUSB_COUNTOFINTERRUPTBUFFERS);

      { Get capabilities }
      HidD_GetPreparsedData( DevHandle, preparsedData);
      if (preparsedData) then
      begin
        HidP_GetCaps( preparsedData, hidCaps);
        Result.BufferSize := hidCaps.OutputReportByteLength;
      end
      else 
       Result.BufferSize := 11;

      closeHandle( DevHandle);
    end;
    FreeMem( pStr);
  End;

Begin
  FoundIdx   := 0;
  DeviceList := Nil;
  { Get GUID of hid class }
  HidD_GetHidGuid( HID_GUIid);
  { Get a list of devices belonging to HID class }
  HIDinfo := SetupDiGetClassDevs( @HID_GUIid,
                                  nil,
                                  GetDesktopWindow(),
                                  DIGCF_DEVICEINTERFACE or DIGCF_PRESENT);
  { Go through list of devices }
  If thandle(HIDinfo) <> INVALID_HANDLE_VALUE then
  begin
    CurIdx := 0;
    spdid.cbSize := SizeOf(spdid);
    While SetupDiEnumDeviceInterfaces( HIDinfo,
                                       nil,
                                       HID_GUIid,
                                       curIdx,
                                        spdid) do
    begin
      dwSize := 0;
      { Get device path for Createfile calls }
      SetupDiGetDeviceInterfaceDetail( HIDinfo,
                                       @spdid,
                                       nil,
                                       dwSize,
                                       @dwSize,
                                       nil);
      If dwSize > 0 then
      begin
        GetMem(pSpDidd, dwSize);
        pSpDidd^.cbSize := SizeOf( TSPDEVICEINTERFACEDETAILDATAA);
        spddd.cbSize    := SizeOf(spddd);
        If SetupDiGetDeviceInterfaceDetail( HIDinfo,
                                            @spdid,
                                            pSpDidd,
                                            dwSize,
                                            @dwSize,
                                            @spddd) then
        begin
          SymbolicLink := PChar( @(pSpDidd^.DevicePath));

          { Get information about the device (Vendor and 
            Product IDs, Strings, ...) }
          FillChar(info, SizeOf(Info), 0);
          Info        := GetHidDeviceInfo( @(pSpDidd^.DevicePath));
          Info.Handle := INVALID_HANDLE_VALUE;

          { check if VID/PID match targets }
          If (Info.VID = TargetVID) AND
             (Info.PID = TargetPID) then
          begin
            { Add Devices to result list }
            SetLength(DeviceList, FoundIdx + 1);
            DeviceList[foundIdx] := Info;
            Inc(FoundIdx);
          end
          else  // list all HID devices if no target is specified
            If (TargetVID = 0) AND (TargetPID = 0) then
            begin
              { Add Devices to result list }
              SetLength( DeviceList, FoundIdx + 1);
              DeviceList[FoundIdx] := Info;

              Inc(FoundIdx);
            end;
        end;

        FreeMem( pSpDidd);
      end;
      inc(CurIdx);
    end;
    SetupDiDestroyDeviceInfoList( HIDinfo);
  end;
End;

procedure TForm1.Button1Click(Sender: TObject);
Var
  DeviceList : THIDDeviceList;
  I          : Integer;
begin
  ScanForHIDdevices( DeviceList, 0, 0);
  Memo1.Lines.Clear;
  Memo1.Lines.Add(IntToStr(Length(DeviceList)) + ' device(s) found');
  If Length(DeviceList) > 0 then
    For I := 0 to Length(DeviceList)-1 do
      With DeviceList[I] do
      begin
        Memo1.Lines.Add('Device Number : '   + IntToStr(I));
        Memo1.Lines.Add('Symbolic link : '   + SymLink);
        Memo1.Lines.Add('Handle        : 0x' + IntToHex(Handle, 1));
        Memo1.Lines.Add('Buffer size   : '   + IntToStr(BufferSize));
        Memo1.Lines.Add('VID           : 0x' + IntToHex(VID, 4));
        Memo1.Lines.Add('PID           : 0x' + IntToHex(PID, 4));
        Memo1.Lines.Add('Version       : '   + IntToStr(VersionNumber));
        Memo1.Lines.Add('Manufacturer  : '   + ManufacturerString);
        Memo1.Lines.Add('Product name  : '   + ProductString);
        Memo1.Lines.Add('Serial number : '   + SerialNumberString);
        Memo1.Lines.Add(' ');
      end;
  Memo1.SetFocus;
end;

Answer 1

在调用任何这些函数之前，必须加载DLL模块：

LoadHid();
LoadSetupApi();

我想我们必须在程序完成后卸载DLL。 然后使用此代码：

UnloadHid;
UnloadSetupApi