Redirect std::cout & std::cerr to vsg::Loggger

examples/app/vsgviewer/vsgviewer.cpp

@@ -50,6 +50,9 @@ int main(int argc, char** argv)
         // set up defaults and read command line arguments to override them
         vsg::CommandLine arguments(&argc, argv);
 
+        // if we want to redirect std::cout and std::cerr to the vsg::Logger call vsg::Logger::redirect_stdout()
+        if (arguments.read({"--redirect-std", "-r"})) vsg::Logger::instance()->redirect_std();
+
         // set up vsg::Options to pass in filepaths, ReaderWriters and other IO related options to use when reading and writing files.
         auto options = vsg::Options::create();
         options->sharedObjects = vsg::SharedObjects::create();

examples/io/vsglog/vsglog.cpp

@@ -10,27 +10,27 @@ class CustomLogger : public vsg::Inherit<vsg::Logger, CustomLogger>
 protected:
     void debug_implementation(const std::string_view& message) override
     {
-        std::cout<<"custom debug : "<<message<<"\n";
+        fprintf(stdout, "custom debug: %.*s\n", static_cast<int>(message.length()), message.data());
     }
 
     void info_implementation(const std::string_view& message) override
     {
-        std::cout<<"custom info : "<<message<<"\n";
+        fprintf(stdout, "custom info: %.*s\n", static_cast<int>(message.length()), message.data());
     }
 
     void warn_implementation(const std::string_view& message) override
     {
-        std::cerr<<"custom warn : "<<message<<std::endl;
+        fprintf(stderr, "custom warn: %.*s\n", static_cast<int>(message.length()), message.data());
     }
 
     void error_implementation(const std::string_view& message) override
     {
-        std::cerr<<"custom error : "<<message<<std::endl;
+        fprintf(stderr, "custom error: %.*s\n", static_cast<int>(message.length()), message.data());
     }
 
     void fatal_implementation(const std::string_view& message) override
     {
-        std::cerr<<"custom error : "<<message<<std::endl;
+        fprintf(stderr, "custom error: %.*s\n", static_cast<int>(message.length()), message.data());
         throw vsg::Exception{std::string(message)};
     }
 };
@@ -46,7 +46,12 @@ int main(int argc, char** argv)
     // you can override the message verbosity by setting the minimum level that will be printed.
     vsg::Logger::instance()->level = level;
 
+    // if we want to redirect std::cout and std::cerr to the vsg::Logger call vsg::Logger::redirect_stdout()
+    if (arguments.read({"--redirect-std", "-r"})) vsg::Logger::instance()->redirect_std();
+
     // simplest form of messaging gets passed to the vsg::Logger::instance().
+    std::cout<<"cout cstring"<<std::endl;
+    std::cerr<<"cerr cstring"<<std::endl;
     vsg::debug("debug string");
     vsg::info("info cstring");
     vsg::warn("warn cstring");

examples/io/vsglog_mt/vsglog_mt.cpp

@@ -12,6 +12,7 @@ struct MyOperation : public vsg::Inherit<vsg::Operation, MyOperation>
         auto level = vsg::Logger::Level(1 + value % 4);
         vsg::info("info() operation ",value);
         vsg::log(level, "log() operation ",value);
+        std::cout<<"cout operation "<<value<<std::endl;
     }
 };
 
@@ -25,6 +26,10 @@ int main(int argc, char** argv)
     mt_logger->setThreadPrefix(std::this_thread::get_id(), "main | ");
 
     vsg::CommandLine arguments(&argc, argv);
+
+    // if we want to redirect std::cout and std::cerr to the vsg::Logger call vsg::Logger::redirect_stdout()
+    if (arguments.read({"--redirect-std", "-r"})) vsg::Logger::instance()->redirect_std();
+
     auto numThreads = arguments.value<size_t>(16, "-t");
     auto count = arguments.value<size_t>(100, "-n");
     auto level = vsg::Logger::Level(arguments.value(0, "-l"));