successfully claim printer interace

src/gui/CMakeLists.txt

@@ -29,7 +29,7 @@ set(GUI_SOURCES
 
 add_executable(kima2 ${GUI_SOURCES})
 target_include_directories(kima2 PRIVATE ${PROJECT_BINARY_DIR})
-target_link_libraries(kima2 core Qt5::Widgets Qt5::PrintSupport stdc++fs)
+target_link_libraries(kima2 core printer Qt5::Widgets Qt5::PrintSupport stdc++fs)
 if(WIN32)
     set_target_properties(kima2 PROPERTIES LINK_FLAGS "-mwindows")
 endif(WIN32)

src/gui/settingsdialog.cpp

@@ -1,6 +1,7 @@
 #include "settingsdialog.h"
 
 #include <database.h>
+#include <posprinter.h>
 
 #include <QMessageBox>
 #include <QSettings>
@@ -19,6 +20,11 @@ SettingsDialog::SettingsDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(par
     ui_.posPrinterDeviceEdit->setText(posPrinterDevice);
     ui_.feePercentSpinBox->setValue(feeInPercent);
     ui_.maxFeeSpinBox->setValue(maxFeeInEuro);
+
+    connect(ui_.testPosPrinterButton, &QPushButton::clicked, this, [](){
+        //PosPrinter::initialize({0, 0});
+        PosPrinter printer;
+    });
 }
 
 void SettingsDialog::accept()

src/printer/CMakeLists.txt

@@ -5,5 +5,5 @@ set(PRINTER_SOURCES
 )
 
 add_library(printer STATIC ${PRINTER_SOURCES})
-target_link_libraries(printer ${LibUSB_LIBRARY})
+target_link_libraries(printer ${LIBUSB_1_LIBRARIES})
 target_include_directories(printer PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

src/printer/posprinter.cpp

@@ -4,9 +4,7 @@
 #include <iostream>
 #include <string>
 
-PosPrinter::PosPrinter() : PosPrinter(std::pair<int, int>{0x0456, 0x0808}) {}
+PosPrinter::PosPrinter()
-
-PosPrinter::PosPrinter(std::pair<int, int> vendorModelId)
 {
     int retValue;
 
@@ -15,17 +13,50 @@ PosPrinter::PosPrinter(std::pair<int, int> vendorModelId)
         throw std::runtime_error("Init error");
     }
 
-    // libusb_set_debug(contextPtr_, 3); // set verbosity level to 3, as suggested in the
+    libusb_device** devList;
-    // documentation
+    int devCount = libusb_get_device_list(contextPtr_, &devList);
+    if (devCount <= 0) {
+        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) {
+                numDevice = i;
+                break;
+            }
+        }
+    }
 
-    devicePtr_ =
+    if (numDevice < 0) {
-        libusb_open_device_with_vid_pid(contextPtr_, vendorModelId.first,
+        libusb_exit(contextPtr_);
-                                        vendorModelId.second); // these are vendorID and productID
+        return;
-    if (devicePtr_ == NULL) {
+    }
+
+    retValue = libusb_open(devList[numDevice], &devicePtr_); // these are vendorID and productID
+    if (retValue != 0) {
+        libusb_free_device_list(devList, 1);
+        libusb_exit(contextPtr_);
         throw std::runtime_error("Cannot open printer device");
     }
 
-    // ...
+    if (libusb_kernel_driver_active(devicePtr_, 0) == 1) { // find out if kernel driver is attached
+        std::cout << "Kernel Driver Active" << std::endl;
+        if (libusb_detach_kernel_driver(devicePtr_, 0) == 0) // detach it
+            std::cout << "Kernel Driver Detached!" << std::endl;
+    }
+
+    retValue = libusb_claim_interface(
+        devicePtr_, 0); // claim interface 0 (the first) of device (mine had jsut 1)
+    if (retValue < 0) {
+        std::cout << "Cannot Claim Interface" << std::endl;
+        throw std::runtime_error("Cannot claim interface");
+    }
+
+    libusb_free_device_list(devList, 1);
 }
 
 PosPrinter::~PosPrinter()
@@ -40,15 +71,4 @@ PosPrinter::~PosPrinter()
 
     libusb_close(devicePtr_); // close the device we opened
     libusb_exit(contextPtr_); // close the session
-
-    delete instance_;
 }
-
-void PosPrinter::initialize(std::pair<int, int> vendorModelId)
-{
-    if (!instance_) {
-        instance_ = new PosPrinter(vendorModelId);
-    }
-}
-
-PosPrinter* PosPrinter::getInstance() { return instance_; }

src/printer/posprinter.h

@@ -5,18 +5,24 @@
 
 #include <libusb-1.0/libusb.h>
 
+struct SupportedPrinters {
+    std::array<std::pair<int, int>, 2> models{
+        // {Vendor ID, Model ID}
+        std::make_pair(0x0456, 0x0808),
+        std::make_pair(0x0416, 0x5011),
+    };
+};
+
 class PosPrinter
 {
   public:
-    static void initialize(std::pair<int, int> vendorModelIds);
-    static PosPrinter* getInstance();
-  private:
     PosPrinter();
-    PosPrinter(std::pair<int, int> vendorModelId);
     ~PosPrinter();
-    static PosPrinter* instance_;
+
+  private:
     libusb_context* contextPtr_{};
     libusb_device_handle* devicePtr_{};
+    SupportedPrinters supportedPrinters_;
 };
 
 #endif