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annotate java/jdc/examples/UnixLibCExample.java @ 56:16151547265e

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made callback example python 2 compatible, and added some randomness to numbers to sort
author Tassilo Philipp
date Tue, 02 Feb 2021 21:07:41 +0100
parents 4ee8d6aa7721
children
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1 import org.dyncall.DC;
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2
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3 // This example tries to make use of each call in the binding.
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4 class UnixLibCExample
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5 {
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6 public static void main(String args[])
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7 {
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8 long lib = DC.loadLibrary("/usr/lib/libc.so");
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9 System.out.format("libc.so handle: %x\n", lib);
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10
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11 long f0 = DC.find(lib, "strlen");
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12 System.out.format("found strlen at: %x\n", f0);
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13
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14 long f1 = DC.find(lib, "strstr");
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15 System.out.format("found strstr at: %x\n", f1);
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16
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17 long f2 = DC.find(lib, "strncmp");
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18 System.out.format("found strncmp at: %x\n", f2);
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19
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20 long vm = DC.newCallVM(4096);
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21 DC.reset(vm);
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22 System.out.format("dcGetError() = %d\n", DC.getError(vm));
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23 DC.mode(vm, 1234567); // bogus mode, should set error
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24 System.out.format("dcGetError() = %d (after trying to set bogus mode)\n", DC.getError(vm));
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25 DC.mode(vm, DC.C_DEFAULT); // good mode, should clear error
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26 System.out.format("dcGetError() = %d (after setting valid mode)\n", DC.getError(vm));
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27
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28 // String param.
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29 DC.argString(vm, "This is a Java string of 33 chars");
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30 int r0 = DC.callInt(vm, f0);
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31 System.out.format("strlen(\"This is a Java string of 33 chars\") = %d\n", r0);
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32
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33 // String param and string/pointer return.
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34 DC.reset(vm);
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35 DC.argString(vm, "This is a Java string");
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36 DC.argString(vm, "Java");
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37 String r1 = DC.callString(vm, f1); // will return a copy of the output string, not like a pointer in C
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38 System.out.format("strlen(\"This is a Java string\", \"Java\") = %s\n", r1);
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39 long r1l = DC.callPointer(vm, f1); // test returning the pointer as long
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40 System.out.format("strlen(\"This is a Java string\", \"Java\") = 0x%x (returned pointer, pointless here, but serves as example)\n", r1l);
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41
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42 DC.reset(vm);
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43 DC.argString(vm, "This is a Java string");
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44 DC.argString(vm, "This is");
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45 DC.argInt(vm, 6);
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46 int r2 = DC.callInt(vm, f2);
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47 System.out.format("strlen(\"This is a Java string\", \"This is\", 6) = %d\n", r2);
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48 DC.reset(vm);
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49 DC.argString(vm, "This is a Java string");
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50 DC.argString(vm, "This is");
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51 DC.argInt(vm, 8);
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52 r2 = DC.callInt(vm, f2);
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53 System.out.format("strlen(\"This is a Java string\", \"This is\", 8) = %d\n", r2);
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54
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55 //DC.reset(vm);
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56 //DC.argDouble(vm, 2.);
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57 //DC.argDouble(vm, 10.);
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58 //double r1 = DC.callDouble(vm, f1);
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59 //System.out.format("pow(2., 10.) = %f\n", r1);
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60
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61 // Done, cleanup.
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62 DC.freeCallVM(vm);
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63 DC.freeLibrary(lib);
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64 }
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65 }
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66