Garbled error message text

[changhexuefei]

in viOpen(): λ����Ϣ�����ϵͳ�в������豸����Դ�� (0x4000FFEE)

[changhexuefei]

Here is a code example from python, it works fine and gets the correct information.

[changhexuefei]

This is the configuration information of the serial device

[pfroud]

First, let's try to fix the garbled error message.

Can you post the full error message stack trace? I want to see which JVisa method the error happens in.

[changhexuefei]

Is it this one?

[changhexuefei]

When I was debugging, I saw garbled characters here，The value of buf is java.nio.HeapByteBuffer[pos=0 lim=256 cap=256]

[changhexuefei]

Hello, when I switched the visa library version to visa32.dll, the garbled characters disappeared.

[changhexuefei]

Hello, do you have a good solution to this problem?

[pfroud]

Right now I do not know a solution. I agree the problem happens in the byteBufferToString() method. The error code for VI_ERROR_RSRC_NFOUND should be 0xBFFF0011, I do not know what 0x4000FFEE means.

Can you open Command Prompt, run these commands:

• java -version
• wmic OS get OSArchitecture

then post the output

[changhexuefei]

[pfroud]

I found that 0xBFFF0011 is the bitwise inverse of 0x4000FFEE. Where did you find that text which has -0x4000ffee?

Can you edit the byteBufferToString method to be this code, then run your example;

protected static String byteBufferToString(ByteBuffer buf) {
    java.nio.charset.Charset[] standardCharsets = new java.nio.charset.Charset[]{
        java.nio.charset.StandardCharsets.US_ASCII,
        java.nio.charset.StandardCharsets.ISO_8859_1,
        java.nio.charset.StandardCharsets.UTF_8,
        java.nio.charset.StandardCharsets.UTF_16BE,
        java.nio.charset.StandardCharsets.UTF_16LE,
        java.nio.charset.StandardCharsets.UTF_16
    };
    for (java.nio.charset.Charset charset : standardCharsets) {
        System.out.printf("%10s: \"%s\"\n", charset, new String(buf.array(), charset).trim());
    }
    return new String(buf.array()).trim();
}

[changhexuefei]

Information found at this URL.

https://github.com/varses/awsch/blob/master/lantz/drivers/legacy/visalib.py

I have tried all methods of setting Charset, but to no avail.

[pfroud]

Let's try this next:

protected static String byteBufferToString(ByteBuffer buf) {
    byte[] bytes = buf.array();
    for (int i = 0; i < bytes.length; i++) {
        System.out.printf("%3d: %3d == 0x%02X\n", i, bytes[i], bytes[i]);
    }
    return new String(buf.array()).trim();
}

[changhexuefei]

Now I changed the GPIB device and got the following error message when running:

0: -50 == 0xCE
1: -34 == 0xDE
2: -73 == 0xB7
3: -88 == 0xA8
4: -43 == 0xD5
5: -46 == 0xD2
6: -75 == 0xB5
7: -67 == 0xBD
8: -69 == 0xBB
9: -14 == 0xF2
10: -68 == 0xBC
11: -45 == 0xD3
12: -44 == 0xD4
13: -40 == 0xD8
14: 86 == 0x56
15: 73 == 0x49
16: 83 == 0x53
17: 65 == 0x41
18: -69 == 0xBB
19: -14 == 0xF2
20: 86 == 0x56
21: 73 == 0x49
22: 83 == 0x53
23: 65 == 0x41
24: -75 == 0xB5
25: -60 == 0xC4
26: -76 == 0xB4
27: -6 == 0xFA
28: -62 == 0xC2
29: -21 == 0xEB
30: -65 == 0xBF
31: -30 == 0xE2
32: -95 == 0xA1
33: -93 == 0xA3
34: 32 == 0x20
35: 32 == 0x20
36: -43 == 0xD5
37: -30 == 0xE2
38: -51 == 0xCD
39: -88 == 0xA8
40: -77 == 0xB3
41: -93 == 0xA3
42: -54 == 0xCA
43: -57 == 0xC7
44: -46 == 0xD2
45: -14 == 0xF2
46: -50 == 0xCE
47: -86 == 0xAA
48: -49 == 0xCF
49: -75 == 0xB5
50: -51 == 0xCD
51: -77 == 0xB3
52: -55 == 0xC9
53: -49 == 0xCF
54: -50 == 0xCE
55: -76 == 0xB4
56: -80 == 0xB0
57: -78 == 0xB2
58: -41 == 0xD7
59: -80 == 0xB0
60: -53 == 0xCB
61: -7 == 0xF9
62: -48 == 0xD0
63: -24 == 0xE8
64: -75 == 0xB5
65: -60 == 0xC4
66: -57 == 0xC7
67: -3 == 0xFD
68: -74 == 0xB6
69: -81 == 0xAF
70: -77 == 0xB3
71: -52 == 0xCC
72: -48 == 0xD0
73: -14 == 0xF2
74: -95 == 0xA1
75: -93 == 0xA3
76: 0 == 0x00
77: 0 == 0x00
78: 0 == 0x00
79: 0 == 0x00
80: 0 == 0x00
81: 0 == 0x00
82: 0 == 0x00
83: 0 == 0x00
84: 0 == 0x00
85: 0 == 0x00
86: 0 == 0x00
87: 0 == 0x00
88: 0 == 0x00
89: 0 == 0x00
90: 0 == 0x00
91: 0 == 0x00
92: 0 == 0x00
93: 0 == 0x00
94: 0 == 0x00
95: 0 == 0x00
96: 0 == 0x00
97: 0 == 0x00
98: 0 == 0x00
99: 0 == 0x00
100: 0 == 0x00
101: 0 == 0x00
102: 0 == 0x00
103: 0 == 0x00
104: 0 == 0x00
105: 0 == 0x00
106: 0 == 0x00
107: 0 == 0x00
108: 0 == 0x00
109: 0 == 0x00
110: 0 == 0x00
111: 0 == 0x00
112: 0 == 0x00
113: 0 == 0x00
114: 0 == 0x00
115: 0 == 0x00
116: 0 == 0x00
117: 0 == 0x00
118: 0 == 0x00
119: 0 == 0x00
120: 0 == 0x00
121: 0 == 0x00
122: 0 == 0x00
123: 0 == 0x00
124: 0 == 0x00
125: 0 == 0x00
126: 0 == 0x00
127: 0 == 0x00
128: 0 == 0x00
129: 0 == 0x00
130: 0 == 0x00
131: 0 == 0x00
132: 0 == 0x00
133: 0 == 0x00
134: 0 == 0x00
135: 0 == 0x00
136: 0 == 0x00
137: 0 == 0x00
138: 0 == 0x00
139: 0 == 0x00
140: 0 == 0x00
141: 0 == 0x00
142: 0 == 0x00
143: 0 == 0x00
144: 0 == 0x00
145: 0 == 0x00
146: 0 == 0x00
147: 0 == 0x00
148: 0 == 0x00
149: 0 == 0x00
150: 0 == 0x00
151: 0 == 0x00
152: 0 == 0x00
153: 0 == 0x00
154: 0 == 0x00
155: 0 == 0x00
156: 0 == 0x00
157: 0 == 0x00
158: 0 == 0x00
159: 0 == 0x00
160: 0 == 0x00
161: 0 == 0x00
162: 0 == 0x00
163: 0 == 0x00
164: 0 == 0x00
165: 0 == 0x00
166: 0 == 0x00
167: 0 == 0x00
168: 0 == 0x00
169: 0 == 0x00
170: 0 == 0x00
171: 0 == 0x00
172: 0 == 0x00
173: 0 == 0x00
174: 0 == 0x00
175: 0 == 0x00
176: 0 == 0x00
177: 0 == 0x00
178: 0 == 0x00
179: 0 == 0x00
180: 0 == 0x00
181: 0 == 0x00
182: 0 == 0x00
183: 0 == 0x00
184: 0 == 0x00
185: 0 == 0x00
186: 0 == 0x00
187: 0 == 0x00
188: 0 == 0x00
189: 0 == 0x00
190: 0 == 0x00
191: 0 == 0x00
192: 0 == 0x00
193: 0 == 0x00
194: 0 == 0x00
195: 0 == 0x00
196: 0 == 0x00
197: 0 == 0x00
198: 0 == 0x00
199: 0 == 0x00
200: 0 == 0x00
201: 0 == 0x00
202: 0 == 0x00
203: 0 == 0x00
204: 0 == 0x00
205: 0 == 0x00
206: 0 == 0x00
207: 0 == 0x00
208: 0 == 0x00
209: 0 == 0x00
210: 0 == 0x00
211: 0 == 0x00
212: 0 == 0x00
213: 0 == 0x00
214: 0 == 0x00
215: 0 == 0x00
216: 0 == 0x00
217: 0 == 0x00
218: 0 == 0x00
219: 0 == 0x00
220: 0 == 0x00
221: 0 == 0x00
222: 0 == 0x00
223: 0 == 0x00
224: 0 == 0x00
225: 0 == 0x00
226: 0 == 0x00
227: 0 == 0x00
228: 0 == 0x00
229: 0 == 0x00
230: 0 == 0x00
231: 0 == 0x00
232: 0 == 0x00
233: 0 == 0x00
234: 0 == 0x00
235: 0 == 0x00
236: 0 == 0x00
237: 0 == 0x00
238: 0 == 0x00
239: 0 == 0x00
240: 0 == 0x00
241: 0 == 0x00
242: 0 == 0x00
243: 0 == 0x00
244: 0 == 0x00
245: 0 == 0x00
246: 0 == 0x00
247: 0 == 0x00
248: 0 == 0x00
249: 0 == 0x00
250: 0 == 0x00
251: 0 == 0x00
252: 0 == 0x00
253: 0 == 0x00
254: 0 == 0x00
255: 0 == 0x00
Exception in thread "main" java.lang.RuntimeException: xyz.froud.jvisa.JVisaException: in viOpen(): �޷��ҵ������VISA��VISA�Ĵ���⡣ ��ͨ������Ϊϵͳ��δ��װ������������� (0x4000FF61)
at xyz.froud.jvisa_example.GPIBExample.main(GPIBExample.java:14)
Caused by: xyz.froud.jvisa.JVisaException: in viOpen(): �޷��ҵ������VISA��VISA�Ĵ���⡣ ��ͨ������Ϊϵͳ��δ��װ������������� (0x4000FF61)
at xyz.froud.jvisa.JVisaResourceManager.checkError(JVisaResourceManager.java:363)
at xyz.froud.jvisa.JVisaResourceManager.openInstrument(JVisaResourceManager.java:170)
at xyz.froud.jvisa_example.GPIBExample.main(GPIBExample.java:12)

[pfroud]

I cannot decode those bytes either

  US-ASCII: "??????????????VISA??VISA??????????  ????????????????????????????????????????"
ISO-8859-1: "�޷��ҵ������VISA��VISA�Ĵ���⡣  ��ͨ������Ϊϵͳ��δ��װ�������������"
     UTF-8: "???????????VISA??VISA??????  ???????????????????????????????"
  UTF-16BE: "?????????????????�????????????????????"
  UTF-16LE: "????????????????�????????????????????"
    UTF-16: "?????????????????�????????????????????"