pos printer introduced

cmake/FindLibUSB.cmake

@@ -0,0 +1,98 @@
+# - Try to find libusb-1.0
+# Once done this will define
+#
+#  LIBUSB_1_FOUND - system has libusb
+#  LIBUSB_1_INCLUDE_DIRS - the libusb include directory
+#  LIBUSB_1_LIBRARIES - Link these to use libusb
+#  LIBUSB_1_DEFINITIONS - Compiler switches required for using libusb
+#
+#  Adapted from cmake-modules Google Code project
+#
+#  Copyright (c) 2006 Andreas Schneider <mail@cynapses.org>
+#
+#  (Changes for libusb) Copyright (c) 2008 Kyle Machulis <kyle@nonpolynomial.com>
+#
+# Redistribution and use is allowed according to the terms of the New BSD license.
+#
+# CMake-Modules Project New BSD License
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+#
+# * Neither the name of the CMake-Modules Project nor the names of its
+#   contributors may be used to endorse or promote products derived from this
+#   software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+#  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+
+if (LIBUSB_1_LIBRARIES AND LIBUSB_1_INCLUDE_DIRS)
+  # in cache already
+  set(LIBUSB_FOUND TRUE)
+else (LIBUSB_1_LIBRARIES AND LIBUSB_1_INCLUDE_DIRS)
+  find_path(LIBUSB_1_INCLUDE_DIR
+    NAMES
+	libusb.h
+    PATHS
+      /usr/include
+      /usr/local/include
+      /opt/local/include
+      /sw/include
+	PATH_SUFFIXES
+	  libusb-1.0
+  )
+
+  find_library(LIBUSB_1_LIBRARY
+    NAMES
+      usb-1.0 usb
+    PATHS
+      /usr/lib
+      /usr/local/lib
+      /opt/local/lib
+      /sw/lib
+  )
+
+  set(LIBUSB_1_INCLUDE_DIRS
+    ${LIBUSB_1_INCLUDE_DIR}
+  )
+  set(LIBUSB_1_LIBRARIES
+    ${LIBUSB_1_LIBRARY}
+)
+
+  if (LIBUSB_1_INCLUDE_DIRS AND LIBUSB_1_LIBRARIES)
+     set(LIBUSB_1_FOUND TRUE)
+  endif (LIBUSB_1_INCLUDE_DIRS AND LIBUSB_1_LIBRARIES)
+
+  if (LIBUSB_1_FOUND)
+    if (NOT libusb_1_FIND_QUIETLY)
+      message(STATUS "Found libusb-1.0:")
+	  message(STATUS " - Includes: ${LIBUSB_1_INCLUDE_DIRS}")
+	  message(STATUS " - Libraries: ${LIBUSB_1_LIBRARIES}")
+    endif (NOT libusb_1_FIND_QUIETLY)
+  else (LIBUSB_1_FOUND)
+    if (libusb_1_FIND_REQUIRED)
+      message(FATAL_ERROR "Could not find libusb")
+    endif (libusb_1_FIND_REQUIRED)
+  endif (LIBUSB_1_FOUND)
+
+  # show the LIBUSB_1_INCLUDE_DIRS and LIBUSB_1_LIBRARIES variables only in the advanced view
+  mark_as_advanced(LIBUSB_1_INCLUDE_DIRS LIBUSB_1_LIBRARIES)
+
+endif (LIBUSB_1_LIBRARIES AND LIBUSB_1_INCLUDE_DIRS)

src/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory("core")
+add_subdirectory("printer")
 add_subdirectory("gui")

src/printer/CMakeLists.txt

@@ -0,0 +1,9 @@
+find_package(LibUSB REQUIRED)
+
+set(PRINTER_SOURCES
+    posprinter.cpp
+)
+
+add_library(printer STATIC ${PRINTER_SOURCES})
+target_link_libraries(printer ${LibUSB_LIBRARY})
+target_include_directories(printer PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

src/printer/posprinter.cpp

@@ -0,0 +1,54 @@
+#include "posprinter.h"
+
+#include <exception>
+#include <iostream>
+#include <string>
+
+PosPrinter::PosPrinter() : PosPrinter(std::pair<int, int>{0x0456, 0x0808}) {}
+
+PosPrinter::PosPrinter(std::pair<int, int> vendorModelId)
+{
+    int retValue;
+
+    retValue = libusb_init(&contextPtr_);
+    if (retValue < 0) {
+        throw std::runtime_error("Init error");
+    }
+
+    // libusb_set_debug(contextPtr_, 3); // set verbosity level to 3, as suggested in the
+    // documentation
+
+    devicePtr_ =
+        libusb_open_device_with_vid_pid(contextPtr_, vendorModelId.first,
+                                        vendorModelId.second); // these are vendorID and productID
+    if (devicePtr_ == NULL) {
+        throw std::runtime_error("Cannot open printer device");
+    }
+
+    // ...
+}
+
+PosPrinter::~PosPrinter()
+{
+    int retValue;
+    retValue = libusb_release_interface(devicePtr_, 0); // release the claimed interface
+    if (retValue != 0) {
+        std::cout << "Cannot Release Interface" << std::endl;
+    } else {
+        std::cout << "Released Interface" << std::endl;
+    }
+
+    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

@@ -0,0 +1,22 @@
+#ifndef POS_PRINTER_H
+#define POS_PRINTER_H
+
+#include <memory>
+
+#include <libusb-1.0/libusb.h>
+
+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_;
+    libusb_context* contextPtr_{};
+    libusb_device_handle* devicePtr_{};
+};
+
+#endif