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comparison USBLib/Descriptor/UsbDescriptor.cs @ 96:94df2951d118

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USBLib: fix USB string descriptor retrieval
author Ivo Smits <Ivo@UCIS.nl>
date Thu, 26 Jun 2014 21:04:20 +0200
parents e811297f5aa4
children
comparison
equal deleted inserted replaced
95:ebdff34b9e4f 96:94df2951d118
46 int slen = buffer[offset]; 46 int slen = buffer[offset];
47 if (slen > length) throw new InvalidOperationException("The string has been truncated"); 47 if (slen > length) throw new InvalidOperationException("The string has been truncated");
48 return Encoding.Unicode.GetString(buffer, offset + 2, slen - 2); 48 return Encoding.Unicode.GetString(buffer, offset + 2, slen - 2);
49 } 49 }
50 public static String GetStringFromDevice(IUsbInterface device, byte index, short langId) { 50 public static String GetStringFromDevice(IUsbInterface device, byte index, short langId) {
51 Byte[] buff = new Byte[256]; 51 Byte[] buff = new Byte[255];
52 int len = device.GetDescriptor((Byte)UsbDescriptorType.String, index, langId, buff, 0, buff.Length); 52 int len = device.GetDescriptor((Byte)UsbDescriptorType.String, index, langId, buff, 0, buff.Length);
53 if (len == 0) return null; 53 if (len == 0) return null;
54 return GetString(buff, 0, len); 54 return GetString(buff, 0, len);
55 } 55 }
56 } 56 }