Re: libusb_control_transfer returns LIBUSB_ERROR_IO and GetLastError()=1186 (Win7)

Thank you for the reply. I've tried hidapi library, looks like it works, but 
hid_write() call return "Invalid Parameter" error. However I am using
sources from test project from their site.
How to fix please? Maybe it my USB keyboard error, because of no lib can
read/write to it. I've tried with libusb, Windows HID API, hidapi library.
No success everywhere.

memset(buf,0,sizeof(buf));

// Toggle LED (cmd 0x80). The first byte is the report number (0x1).
buf[0] = 0x1;
buf[1] = 0x81;
res = hid_write(handle, buf, 17);
if (res < 0) { // returns -1
	printf("Unable to write()\n");
	printf("Error: %ls\n", hid_error(handle));
}



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