Delphi7和Delphi XE2中的Delphi HID [英] Delphi HID in Delphi7 and Delphi XE2
本文介绍了Delphi7和Delphi XE2中的Delphi HID的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在Delphi 7中制作了一个小程序，以显示所有连接的HID设备的一些详细信息。我只使用了 SetupAPI ， Moduleloader 和 HID.pas 。这很完美。
当我使用相同的代码并在Delphi XE2或2010中编译该代码时，它无法产生所需的输出。
I made a small program in Delphi 7 to show some details of all attached HID devices. I only used system files like SetupAPI, Moduleloader and HID.pas. This works perfect.
When I take the same code and compile it in Delphi XE2 or (2010 for that matter), it fails to produce the required output.
可能与指针转换有关，但我找不到根本原因。
Probably this has something to do with pointer casting or so, but I cannot find the root cause.
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;
推荐答案
在调用任何函数之前，必须加载DLL模块以下功能之一：
You have to load the DLL module before you call any of these functions:
LoadHid();
LoadSetupApi();
我想我们必须在程序完成后卸载DLL。然后使用以下代码：
I suppose that we have to unload the DLL when finished with the program. Then use this code:
UnloadHid;
UnloadSetupApi
这篇关于Delphi7和Delphi XE2中的Delphi HID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
