support specifying pos printer

src/printer/posprinter.cpp

@@ -35,14 +35,24 @@ PosPrinter::PosPrinter()
         libusb_exit(contextPtr_);
         throw std::runtime_error("Could not receive device list");
     }
+
     int numDevice = -1;
+
     for (int i = 0; i < devCount; ++i) {
         libusb_device_descriptor desc;
         libusb_get_device_descriptor(devList[i], &desc);
-        for (const auto& supported : supportedPrinters_.models) {
-            if (desc.idVendor == supported.first && desc.idProduct == supported.second) {
+
+        if (printerDevice_.idVendor == 0) {
+            for (const auto& supported : supportedPrinters_.models) {
+                if (desc.idVendor == supported.first && desc.idProduct == supported.second) {
+                    numDevice = i;
+                    break;
+                }
+            }
+        } else {
+            if (desc.idVendor == printerDevice_.idVendor &&
+                desc.idProduct == printerDevice_.idProduct) {
                 numDevice = i;
-                break;
             }
         }
     }
@@ -75,6 +85,11 @@ PosPrinter::PosPrinter()
     libusb_free_device_list(devList, 1);
 }
 
+PosPrinter::PosPrinter(const PrinterDevice& printerDevice) : printerDevice_{printerDevice}
+{
+    PosPrinter();
+}
+
 PosPrinter::~PosPrinter()
 {
     if (devicePtr_) {

src/printer/posprinter.h

@@ -16,10 +16,16 @@ struct SupportedPrinters {
     };
 };
 
+struct PrinterDevice {
+    int idVendor{};
+    int idProduct{};
+};
+
 class PosPrinter
 {
   public:
     PosPrinter();
+    PosPrinter(const PrinterDevice& printerDevice);
     ~PosPrinter();
     void write(const std::string& text);
     void printHeader();
@@ -43,6 +49,7 @@ class PosPrinter
     libusb_context* contextPtr_{};
     libusb_device_handle* devicePtr_{};
     SupportedPrinters supportedPrinters_;
+    PrinterDevice printerDevice_;
 };
 
 #endif