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POwhy can't i get report from hid usb device by GetInputReport
 

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  1. POwhy can't i get report from hid usb device by GetInputReport
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    <p>In my delphi application, i use TJvHidDevice for writing and reading report from a usb device.</p> <p>The <strong>device info</strong> bellows</p> <pre><code>Bus Type: USB Device Type: Human Interface Device Power Drawn: 100 milliamps @ 5.0 volts Endpoint 0: Type=CTL Class=03 SubClass=00 Protocol=00 MaxPacket=8 Endpoint 1 OUT: Type=INT Class=03 SubClass=00 Protocol=00 MaxPacket=40 Endpoint 2 IN: Type=INT Class=03 SubClass=00 Protocol=00 MaxPacket=40 Hardware ID: USB\Vid_0483&amp;Pid_5750&amp;Rev_0200 Data Read: 572 bytes Data Written: 384 bytes Utilization: 100% </code></pre> <p>It has three endpoints,and it will out put report with endpoint 2 when i send report to it. My codes are</p> <p><strong>Report structure</strong></p> <pre><code>TReport = packed record ReportID: byte; Data: array[0..64] of byte; end; </code></pre> <p><strong>Check out Device</strong></p> <pre><code>procedure TfrmMain.HidDevsDeviceChange(Sender: TObject); begin if HidDevs.CheckOutByID(FHidDev, USB_VID, USB_PID) then begin FHidDev.NumInputBuffers := 65; FHidDev.NumOverlappedBuffers := 65; FUsbDevice.Device := FHidDev; FHidDev.OnData:=OnRead; end; end; </code></pre> <p><strong>OnRead Enent</strong></p> <pre><code>procedure TfrmMain.OnRead(HidDev: TJvHidDevice; ReportID: Byte; const Data: Pointer; Size: Word); var I: Integer; Str: string; begin Str := Format('RD %.2x ', [ReportID]); for I := 0 to Size - 1 do Str := Str + Format('%.2x ', [Cardinal(PChar(Data)[I])]); AddLog('Received: '); SetLogColor(clPurple); AddLog(Str, False); end; </code></pre> <p>I can write report by </p> <pre><code>if not FDevice.SetOutputReport(FBuffer, FDevice.Caps.OutputReportByteLength) then </code></pre> <p>but , after <strong>SetOutputReport</strong> nothing happens.If i used <strong>GetInputReport</strong> instead of <strong>OnRead</strong>, there will be an error : 31 , if use <strong>readFile</strong>,the application will hang up. why,and what should i do?</p>
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    1. USKen White
    1. USGoldli Zh
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      1. POwhy can't i get report from hid usb device by GetInputReport
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      1. VTUpMod
    2. VO
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      1. POwhy can't i get report from hid usb device by GetInputReport
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      1. VTUpMod
    1. COIt's helpful if you add the appropriate language tag (in this case, `delphi`) when your question is specific to that language.
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      1. POwhy can't i get report from hid usb device by GetInputReport
      1. USKen White
    2. COthanks.but who can helps me?
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      1. POwhy can't i get report from hid usb device by GetInputReport
      1. USGoldli Zh
 

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