Merge pull request #2293 from mavlink/pr-log-callback-example

examples: add log_callback demo

examples/CMakeLists.txt

@@ -24,6 +24,7 @@ add_subdirectory(ftp_server)
 add_subdirectory(geofence)
 add_subdirectory(gimbal)
 add_subdirectory(gimbal_device_tester)
+add_subdirectory(log_callback)
 add_subdirectory(logfile_download)
 add_subdirectory(log_streaming)
 add_subdirectory(manual_control)

examples/log_callback/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.10.2)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+project(log_callback)
+
+add_executable(log_callback
+    log_callback.cpp
+)
+
+find_package(MAVSDK REQUIRED)
+
+target_link_libraries(log_callback
+    MAVSDK::mavsdk
+)
+
+if(NOT MSVC)
+    add_compile_options(log_callback PRIVATE -Wall -Wextra)
+else()
+    add_compile_options(log_callback PRIVATE -WX -W2)
+endif()

examples/log_callback/log_callback.cpp

@@ -0,0 +1,30 @@
+//
+// Example how to customize MAVSDK log messages.
+//
+
+#include <mavsdk/mavsdk.h>
+#include <mavsdk/log_callback.h>
+
+#include <iostream>
+
+using namespace mavsdk;
+
+int main(int, char**)
+{
+    // Set our own custom log function.
+    log::subscribe(
+        [](log::Level level, const std::string& message, const std::string& file, int line) {
+            std::cout << "My custom print function: " << message << std::endl;
+
+            // Prevent unused warnings.
+            (void)level;
+            (void)file;
+            (void)line;
+            return true;
+        });
+
+    // Instantiate Mavsdk after. This will just print the version.
+    Mavsdk mavsdk{Mavsdk::Configuration{Mavsdk::ComponentType::GroundStation}};
+
+    return 0;
+}