UE_LOG is a macro that outputs the log message into the log file. The first input parameter it takes is the name of the logging category. There are many of these categories already built into the engine, defined in CoreGlobals.h. You can also create your own custom logging categories.

日志（Logging）意味着在运行期间的某个时间保持事件、函数调用、变量值等的有序记录。 这通常以文本的形式保存在日志文件中。 日志对于 Unreal应用开发 的调试排错非常有帮助，本文涵盖UE4日志宏的语法、日志消息的格式化、自定义日志类别以及如何在屏幕输出日志等内容。 下面是一个简单的日志消息示例： 要利用日志语句中获得输出，请确保在测试更改之前编译项目。 …

2021年2月3日 · The way to log something dynamically with the UE_LOG macro is by treating that third parameter as a format string, even if your format string is simply "%s". If you’re not looking to create your own logging macros, this is how you would log the parameter of a function or some other FString variable:

2016年7月21日 · UE_LOG(LogTemp, Warning, TEXT("%s"), *FPaths::GetPath("../")); should work with Unreal's version of Datatypes instead of using the std library. You can accept your own answer if it's correct :P And try to use Unreal's string, array, map...etc. instead of std ones since Unreal has its own magic...

2021年4月13日 · I think the problem is that you are not using the Game Mode Base, where the UE_LOG is located. You can solve this problem by going to you Project Settings (Edit → Project Settings) and selecting Maps & Modes. Here you can see the Default GameMode. Change that to be the MyProjectGameModeBase that you coded and press Play.

2024年1月22日 · UE_LOG. Here's an example of a simple log output: UE_LOG (LogTemp, Display, TEXT ("This is a log to the console and log file")); The Unreal Engine has implemented the logging function via a macro. This macro expects 3 parameters: The category name. The log verbosity level. The text to be output. Category

2025年3月13日 · Use the Visual Studio Tools for Unreal Engine (UE) to see UE logging within Visual Studio. This is useful because you can see UE logging without having to switch between the Unreal Editor and Visual Studio. The following must be installed: Visual Studio version 17.10 or later. Unreal Engine version 5 or later. Visual Studio Tools for Unreal Engine.

2024年3月6日 · UE_LOGFMT provides modern string interpolation, offered in std::format, std::print and libraries like fmtlib and spdlog. As well as that, we see a way for customizing your Unreal log messages, included in your own C++ source files.

2017年11月30日 · Below are three ways of how to log messages. Below is the full .cpp file. The top two define calls are shortcuts to make logging messages easier.

2022年6月22日 · UE_LOG(LogCategory, LogVerbosity, Message); Here, there are three parameters, the first being the LogCategory. This helps to separate the purpose of logs when filtering, and also contains some verbosity information.