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It is recommended new project should migrate to libusb-1.0 API and use libusb Windows ( http://libusb.info ) instead. For Windows only project, you can also look at libusbK below ( http://libusbk.sourceforge.net/UsbK3/index.html ) libusb-win32 is a port of the USB library libusb 0.1 ( http://sourceforge.net/projects/libusb ) to the Microsoft Windows operating systems (Windows 2000, Windows XP, Windows Vista and Windows 7; Windows 98 SE and Windows ME for versions up to 0.1.12.2 ). The library allows user space applications to access many USB device on Windows in a generic way without writing any line of kernel driver code. Vista/7/2008/2008R2 64 bit are supported from version 1.2.0.0 since a Microsoft KMCS accepted digital signature is embedded in the kernel driver libusb0.sys. Features: Can be used as a filter driver for existing, already installed devices. This feature allows libusb-win32 to communicate with many installed USB device. Starting with v1.2.2.0, a GUI (filter wizard) is provided and it is only to attach the filter driver to particular USB device of interests. So this should be safer to use than the older behavior which tries to attach the filter to all USB device (acting as class filters to all possible device class). It is still possible to do that by using the console version of install-filter.exe but this is only recommended to be used by developers and power users since this could potentially cause BSODs. When you use the device filter mode using the Filter Wizard GUI, you may have to repeat the process if you unplug the device and plug it back in a different port. Can be used as a normal device driver for devices for which no driver exists (self build/developed USB hardware, etc). You can also replace the existing device driver with libusb-win32 device driver if desired. This is the preferred way to use libusb-win32. When you use the Inf-Wizard GUI to replace a device with inbox driver (like HID or USB Mass Storage Device), you may need to repeat the process if you plug in a same device but with different serial number. This is because Windows prefers inbox driver (signed) and ranks it higher than the libusb-win32 driver package. The two methods described above can be used in parallel. However, the device driver mode is the preferred way to use libusb-win32 followed by using device filter driver mode. The class filter driver is not recommended to be used. 100% API and functional compatible with the libusb 0.1 project. Supports all USB transfer: Control, Bulk, Interrupt and Isochronous transfers. Take note the libusb 0.1 under other OS (Linux, Mac OS X, BSDs, etc) does not support Isochronous Transfer. libusb-win32 also has its own asynchronous API which is not available to libusb-0.1 under Linux or other OS. Supports all Standard Device Requests (control messages) described in chapter 9 of the USB specification. Supports vendor specific control messages. License The library (DLL and import lib, examples, installers) is distributed under the terms of the GNU Lesser General Public License (LGPL http://www.gnu.org/licenses/licenses.html#LGPL ). Take note the installers in the older versions of libusb-win32 (before 1.2.0.0) is distributed under GPL, not LGPL. The driver portion (libusb0.sys) is distributed under the terms of the GNU General Public License (GPL http://www.gnu.org/licenses/licenses.html#GPL ). This license combination explicitly allows the use of this library in commercial, non-Open-Source applications. Read the licenses carefully and apply all of their requirements before including this library in a commercial application! In the future the project administrators will add a New BSD option to the license to address the WHQL Licensing issue. Support If something isn't working as expected, make sure that you have installed the the latest version of libusb-win32 and the latest service packs for your OS before requesting for any support. Available Support Options: A mailing list ( https://sourceforge.net/mail/?group_id=78138 ) is available for discussions, questions, bug reports, feature request, and other issues. It is the preferred support channel. Please subscribe ( http://lists.sourceforge.net/lists/listinfo/libusb-win32-devel ) to the list first before posting. The project page offers different forms which can be filled out to get support, to report bugs, or to request new features. Please describe your problems and your system as precise as possible (OS, service packs, version of libusb-win32, type of device, output of "testlibusb-win.exe", etc.). This will make solving problems a lot easier. Debug version of the libusb-win32 are provided from libusb-1.2.3.0 onwards. Together with Microsoft DebugView http://technet.microsoft.com/en-us/sysinternals/bb896647 ), detailed debug information can be printed out to facilitate easier debugging process. You should also read the FAQ (Frequently Asked Questions) Wiki Page https://sourceforge.net/p/libusb-win32/wiki/Faq/ . Download Source code and binary packages can be downloaded from the project download site https://sourceforge.net/projects/libusb-win32/files/ . Source code is also available via anonymous Subversion checkout https://sourceforge.net/p/libusb-win32/code/HEAD/tree/ . Installation '''Installation''' '''Filter Driver Installation''' Please use the latest release version. Versions up until 0.1.12.2 have serious bugs related to the filter drivers under Vista and Windows 7 and some XP installations. Please use later versions (1.1.14.0 or newer). For 64bit Windows Vista/7/2008/2008R2, the vers...