Windows ...javaxusb\windows\x86_64\libusb4java.dll: Can't find dependent libraries

[PeterKieu]

1. Issue: Error running on Windows ...javaxusb\windows\x86_64\libusb4java.dll: Can't find dependent libraries
2. Root cause: In windows, lib-javax-usb3 using 02 DLL files (why??): libusb4java.dll and libusb-1.0.dll But in JNINativeLibraryLoader.load(): Missing code extract and load libusb-1.0.dll.
3. Solution: 3.1. Long-term: Using one dynamic library for libusb4java => rebuild from C code and JNI/JNA wrapping. 3.2. Short-term:

• Add more code to extract libusb-1.0.dll on Windows

• Load libusb-1.0.dll first then load libusb4java.dll Code sample: ` Path destination = Paths.get(System.getProperty("java.io.tmpdir"), "javaxusb", getOSName(), getOSArch(), getLibraryFilename()); Path destinationDependency = Paths.get(System.getProperty("java.io.tmpdir"), "javaxusb", getOSName(), getOSArch(), "libusb-1.0.dll"); if (!getOSName().contains(OS_WINDOWS) && destination.toFile().exists() && destination.toFile().length() > 0) {
  System.load(destination.toString());
  return; }else if(getOSName().contains(OS_WINDOWS) && destinationDependency.toFile().exists() && destinationDependency.toFile().length() > 0){
  System.load(destinationDependency.toString()); System.load(destination.toString()); return; } Path source = Paths.get(url.toURI()); Logger.getLogger(JNINativeLibraryLoader.class.getName()).log(Level.FINE, "Copy USB native library from {0} to {1}", new Object[]{source, destination}); Logger.getLogger(JNINativeLibraryLoader.class.getName()).log(Level.INFO, "Loading native lib {0}", source); if (!destination.toFile().exists()){ Files.copy(source, destination); }

  if(getOSName().contains(OS_WINDOWS)){ URL urlDependedWin32 = JNINativeLibraryLoader.class.getClassLoader().getResource("META-INF/nativelib/" + getOSName() + "/" + getOSArch() + "/" + "libusb-1.0.dll"); source = Paths.get(urlDependedWin32.toURI()); Logger.getLogger(JNINativeLibraryLoader.class.getName()).log(Level.FINE, "Copy USB native library from {0} to {1}", new Object[]{source, destination}); Logger.getLogger(JNINativeLibraryLoader.class.getName()).log(Level.INFO, "Loading native lib {0}", source);

    if (!destinationDependency.toFile().exists()){
    	Files.copy(source, destinationDependency);
    }
  

  } if(getOSName().contains(OS_WINDOWS) ){
  System.load(destinationDependency.toString()); System.load(destination.toString()); }else{ System.load(destination.toString()); } `

[niushapaks]

Works perfectly, thanks !