From 39ea216984f4b7b5aa861c9605ccf5de720bee7e Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Mon, 23 Jul 2018 22:03:37 +0300
Subject: Lifetime problems with opening the device

---
 src/lib.rs | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 2a0a330..9468997 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,32 +5,31 @@ const KNOWN_DEVICES: [(u16, u16, &str); 2] = [
     (0x0bda, 0x2838, "Generic RTL2832U OEM")
 ];
 
-struct Usb {
+struct Usb<'a> {
     ctx: libusb::Context,
-    desc: Option<libusb::DeviceDescriptor>
-    // dev: Option<libusb::Device>
+    dev: Option<libusb::DeviceHandle<'a>>
 }
 
-pub struct RtlSdr {
-    usb: Usb
+pub struct RtlSdr<'a> {
+    usb: Usb<'a>
 }
 
-impl RtlSdr {
+impl<'a> RtlSdr<'a> {
     
-    pub fn new() -> RtlSdr {
+    pub fn new() -> RtlSdr<'a> {
         RtlSdr {
             usb: Usb {
                 ctx: libusb::Context::new().unwrap(),
-                desc: None
+                dev: None
             }
         }
     }
 
     pub fn init(&mut self) {
-        self.usb.desc = self.find_device();
+        self.usb.dev = self.find_device();
     }
 
-    pub fn find_device(&self) -> Option<libusb::DeviceDescriptor> {
+    pub fn find_device(&self) -> Option<libusb::DeviceHandle<'a>> {
         for mut dev in self.usb.ctx.devices().unwrap().iter() {
             let desc = dev.device_descriptor().unwrap();
             let vid = desc.vendor_id();
@@ -38,7 +37,7 @@ impl RtlSdr {
 
             for kd in KNOWN_DEVICES.iter() {
                 if kd.0 == vid && kd.1 == pid {
-                    return Some(desc)
+                    return Some(dev.open().unwrap())
                 }
             }
         }
@@ -53,8 +52,8 @@ mod tests {
     #[test]
     fn test_init() {
         let mut rtlsdr = RtlSdr::new();
-        assert!(rtlsdr.usb.desc.is_none());
+        assert!(rtlsdr.usb.dev.is_none());
         rtlsdr.init();
-        assert!(rtlsdr.usb.desc.is_some());
+        assert!(rtlsdr.usb.dev.is_some());
     }
 }
-- 
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