我在 Delphi 7 中做了一个小程序来显示所有连接的 HID 设备的一些细节。我只使用了系统文件，如SetupAPI,Moduleloader和HID.pas. 这很完美。当我采用相同的代码并在 Delphi XE2 或（2010 年）中编译它时，它无法产生所需的输出。
可能这与指针转换有关，但我找不到根本原因。
任何人都可以帮忙。
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;