Added Usb Detection using libUsb

src/P700Driver.cpp

@@ -3,12 +3,26 @@
 #include <iostream>
 #include <stdexcept>
 
+#include <spdlog/spdlog.h>
+
 namespace ptprnt::driver {
 
-P700Driver::P700Driver(uint16_t UsbDevVendor, uint16_t UsbDevId) {}
+P700Driver::P700Driver(std::shared_ptr<Usb> usbDriver, uint16_t usbDevVendor, uint16_t usbProductId)
+    : mUsbDriver{std::move(usbDriver)}
+    , mUsbDev{.vendorId = usbDevVendor, .productId = usbProductId}
+
+{
+    spdlog::debug("P700Driver constructing");
+    if(!init()) {
+        spdlog::error("Could not find any P700 Printers.");
+    }
+    else {
+        spdlog::info("Found P700 Printer :-).");
+    }
+}
 
 P700Driver::~P700Driver() {
-    
+    spdlog::debug("P700Driver destructing");
 }
 
 driver::info P700Driver::getInfo() {
@@ -27,4 +41,26 @@ bool P700Driver::command() {
     return false;
 }
 
+bool P700Driver::init() {
+    auto devs = mUsbDriver->getDevices();
+
+    if(!devs.has_value()) {
+        spdlog::error("No USB devices found");
+        return false;
+    }
+    
+    auto devIt = std::find_if(devs.value().begin(), devs.value().end(), 
+        [=] (auto dev) { return mUsbDev.vendorId == dev.vendorId && mUsbDev.productId == dev.productId;}
+    );
+
+    if(devIt == devs.value().end()) {
+        spdlog::error("No device with {0:04X}:{1:04X}", mUsbDev.vendorId, mUsbDev.productId);
+        return false;
+    }
+
+    mUsbDev = *devIt;
+
+    return true;
+}
+
 }  // namespace ptprnt::driver

src/Usb.cpp

@@ -2,36 +2,45 @@
 
 #include <iostream>
 #include <iomanip>
+#include <optional>
+#include <spdlog/spdlog.h>
 
 namespace ptprnt::driver {
 
 Usb::Usb() {
-    std::cout << "Usb starting" << std::endl;
+    spdlog::debug("Usb constructing");
     libusb_init(NULL);
 }
 Usb::~Usb() {
-    std::cout << "Usb stopping" << std::endl;
+    spdlog::debug("Usb destructing");
 }
 
-std::vector<UsbDevice> Usb::listDevices() {
+std::optional<std::vector<UsbDevice>> Usb::getDevices() {
     libusb_device ** devs;
     libusb_device *dev;
     struct libusb_device_descriptor desc;
     int r,i=0;
 
+    mDevices.clear();
+
     libusb_get_device_list(NULL, &devs);
 
     while ((dev=devs[i++]) != NULL) {
+        UsbDevice newDev;
+
 		if ((r=libusb_get_device_descriptor(dev, &desc)) < 0) {
-			std::cerr << "failed to open device" << std::endl;
+			spdlog::error("failed to open device");
 			libusb_free_device_list(devs, 1);
+            return std::nullopt;
 		}
 
-        std::cout << std::hex << std::setw(4) << desc.idVendor << ":" << desc.idProduct;
-        std::cout << std::endl;
+        newDev.vendorId = desc.idVendor;
+        newDev.productId = desc.idProduct;
+
+        mDevices.push_back(newDev);
     }
 
-    return std::vector<UsbDevice>();
+    return mDevices;
 }
 
 }  // namespace ptprnt::driver

src/main.cpp

@@ -10,21 +10,28 @@
 
 using namespace ptprnt;
 
-int main(int argc, char** argv) {
-
+void setupLogger() {
+    spdlog::set_level(spdlog::level::debug); 
     spdlog::info("Starting ptprnt {}", PROJ_VERSION);
 
-    auto usb = std::make_unique<driver::Usb>();
-    auto devs = usb->listDevices();
+}
 
-    for (auto dev : devs) {
+int main(int argc, char** argv) {
+    setupLogger();
 
+    auto usb = std::make_shared<driver::Usb>();
+    auto maybeDevs = usb->getDevices();
+    if(!maybeDevs.has_value()) {
+        spdlog::error("No USB devices found");
+        return -1;
     }
 
-    /*auto driver = std::make_unique<driver::P700Driver>();
-    auto printer = std::make_unique<printer::P700Printer>(std::move(driver));
-    printer::info info = printer->getInfo();*/
+    auto driver = std::make_unique<driver::P700Driver>(usb);
+    //auto printer = std::make_unique<printer::P700Printer>(std::move(driver));
+    //printer::info info = printer->getInfo();
 
     return 0;
 }
 
+
+