Question

我正在使用Delphi XE2并尝试将usb通信dll升级到64位。我们正在使用JVCL SetupAPI和Hid单元。所有工作完全使用32位编译器，可以看到我附加的HID设备。我切换到64位，我再也看不到任何我知道的HID设备了。

我遇到有人提到需要以64位不同的方式调整某些数据结构的大小（参见https://forums.embarcadero.com/thread.jspa?messageID=408473#408473），这有所帮助，但我现在正式感到难过。

目前我的代码返回从SetupDiGetDeviceInterfaceDetail函数读取的0个字节。注释掉的SizeOf（）适用于32位但不适用于64位。

非常感谢任何帮助。

repeat
  TmpDeviceInterfaceData.cbSize := SizeOf(TSPDeviceInterfaceData);
  TmpDeviceInterfaceData.cbSize := 32;  // SizeOf(TmpDeviceInterfaceData);
  TmpSuccess := SetupDiEnumDeviceInterfaces(TmpDevInfo, nil, TmpDevHidGuid, TmpDevn, TmpDeviceInterfaceData);
  if TmpSuccess then
  begin
    TmpDevData.cbSize := 32; //SizeOf(TmpDevData);
    showmessage(inttostr(tmpdevdata.cbsize));
    TmpBytesReturned := 0;
    SetupDiGetDeviceInterfaceDetail(TmpDevInfo, @TmpDeviceInterfaceData, nil, 0, TmpBytesReturned, @TmpDevData);
    showmessage('bytes returned = ' + inttostr(TmpBytesReturned));
    if (TmpBytesReturned <> 0) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
    begin
      // showmessage('hello');
      TmpFunctionClassDeviceData := AllocMem(TmpBytesReturned);
      TmpFunctionClassDeviceData.cbSize := sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);

      TmpFunctionClassDeviceData.cbSize := 8;
      // showmessage(inttostr(TmpFunctionClassDeviceData.cbSize));
      if SetupDiGetDeviceInterfaceDetail(TmpDevInfo, @TmpDeviceInterfaceData, TmpFunctionClassDeviceData, TmpBytesReturned, TmpBytesReturned, @TmpDevData) then
      begin
        // showmessage('here');
        try
          begin
          //try to obtain PID and VID information about the HID devices
          TmpDeviceHandle := CreateFile(@TmpFunctionClassDeviceData.DevicePath,
                            GENERIC_READ OR GENERIC_WRITE,
                            FILE_SHARE_READ OR FILE_SHARE_WRITE,
                            NIL, OPEN_EXISTING, 0 , 0);
          TmpAttributes.Size := Sizeof(TmpAttributes);
          HidD_GetAttributes(TmpDeviceHandle, TmpAttributes);
          If (vid = TmpAttributes.VendorID) then
          begin
            PIDlistStr := PIDlistStr + Inttostr(TmpAttributes.ProductID) + ',';
          end ;


          if TmpDeviceHandle <> INVALID_HANDLE_VALUE then
           begin
            CloseHandle(TmpDeviceHandle);
            TmpAttributes.ProductID := 0;
            TmpAttributes.VendorID := 0;
           end;
          TmpDeviceHandle := INVALID_HANDLE_VALUE;
          end
        except
          // ignore device if unreadable
        end;
        Inc(TmpDevn);
      end
    else
      showmessage('error in SetupDiGetDeviceInterfaceDetails');
      FreeMem(TmpFunctionClassDeviceData);
    end;
  end;
until not TmpSuccess;

Answer 1

所以，经过艰苦的努力，我得到了这个工作。虽然我必须深入研究JVCL SetupApi单元并更改一些结构的变量类型，但最终修复并不过分复杂。

repeat
  TmpDeviceInterfaceData.cbSize := SizeOf(TSPDeviceInterfaceData);
  // showmessage('TSPDeviceInterfaceData: ' + inttostr(SizeOf(TSPDeviceInterfaceData)));
  TmpSuccess := SetupDiEnumDeviceInterfaces(TmpDevInfo, nil, TmpDevHidGuid, TmpDevn, TmpDeviceInterfaceData);
  if TmpSuccess then
  begin
    TmpDevData.cbSize := SizeOf(TmpDevData);
    // showmessage('TmpDevData: ' + inttostr(tmpdevdata.cbsize));
    TmpBytesReturned := 0;
    SetupDiGetDeviceInterfaceDetail(TmpDevInfo, @TmpDeviceInterfaceData, nil, 0, TmpBytesReturned, @TmpDevData);
     //showmessage('bytes returned = ' + inttostr(TmpBytesReturned));  // = 170 in 32 bit app
    inc(i);
    if (TmpBytesReturned <> 0) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
    begin
      // showmessage('i did this ' + inttostr(i) + ' times');
      TmpFunctionClassDeviceData := AllocMem(TmpBytesReturned);

      {$ifdef CPUX64}
         TmpFunctionClassDeviceData.cbSize := 8;
         // showmessage('64 bit compiler used');
      {$else}
         TmpFunctionClassDeviceData.cbSize := 6;
         // showmessage('32 bit compiler used');
      {$endif}

      // showmessage('TmpFunctionClassDeviceData:' + inttostr(sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A)));
      if SetupDiGetDeviceInterfaceDetail(TmpDevInfo, @TmpDeviceInterfaceData, TmpFunctionClassDeviceData, TmpBytesReturned, TmpBytesReturned, @TmpDevData) then
      begin
        try
          begin
          //try to obtain PID and VID information about the HID devices

          s := '';
          for i := 0 to 999 do
           begin
             s := s + TmpFunctionClassDeviceData.DevicePath[i];
           end;

          TmpDeviceHandle := CreateFile(PChar(s),
                            GENERIC_READ OR GENERIC_WRITE,
                            FILE_SHARE_READ OR FILE_SHARE_WRITE,
                            0, OPEN_EXISTING, 0 , 0);

          TmpAttributes.Size := Sizeof(TmpAttributes);
          // showmessage('TmpAttributes: ' + inttostr(Sizeof(TmpAttributes)));

          HidD_GetAttributes(TmpDeviceHandle, TmpAttributes);

          // showmessage(inttostr(TmpAttributes.VendorID) + ' ; ' + inttostr(TmpAttributes.ProductID));

          If (vid = TmpAttributes.VendorID) then
          begin
            PIDlistStr := PIDlistStr + Inttostr(TmpAttributes.ProductID) + ',';
          end ;

          if TmpDeviceHandle <> INVALID_HANDLE_VALUE then
           begin
            CloseHandle(TmpDeviceHandle);
            TmpAttributes.ProductID := 0;
            TmpAttributes.VendorID := 0;
           end;
          TmpDeviceHandle := INVALID_HANDLE_VALUE;
          end
        except
          // ignore device if unreadable
        end;
        Inc(TmpDevn);
      end;
    //else
      //showmessage('bob ' + inttostr(GetLastError));
      FreeMem(TmpFunctionClassDeviceData);
    end;
  end;
until not TmpSuccess;

对于SetupAPI.pas的更改，请在此处查看我的jedi问题跟踪器条目：http://issuetracker.delphi-jedi.org/view.php?id=5706

如果有人能告诉我为什么在传递给CreateFile之前需要将DevicePath显式复制到本地字符串中，或者为什么我不能将SizeOf用于TmpFunctionClassDeviceData.cbSize，我将非常感激。

Answer 2

现在更改是在JVCL中，请使用最新的SVN内容。

基本上，需要修复SetupApi，以便在x64中使用“填充”进行对齐。

这已经过测试，在这里运作良好。

在64位应用程序中使用SetupAPI枚举USB HID设备

2 个答案: