如何从 Windows 服务捕获标准错误输出？
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How to capture standard error output from a Windows service?
提问by veefu
I have an application that makes use of the Mozilla LDAP library. We're diagnosing a problem involving the LDAP library failing to make a connection to the server. I'm attempting to get additional information from the LDAP library by tossing a debug version of the lib in with the application and enabling debug using ldap_set_opt. Unfortunately, I think the debug library is sending debug strings to standard error.
我有一个使用 Mozilla LDAP 库的应用程序。我们正在诊断一个涉及 LDAP 库无法连接到服务器的问题。我试图通过将 lib 的调试版本与应用程序一起放入并使用 ldap_set_opt 启用调试来从 LDAP 库中获取其他信息。不幸的是，我认为调试库正在将调试字符串发送到标准错误。
While I'm working on recompiling the LDAP client library again, hopefully enabling the option that makes it call OutputDebugString instead of streaming to stderr, a nice solution would be to capture the stderr output to a file. The application, though, is running as a Windows service.
当我再次重新编译 LDAP 客户端库时，希望启用使其调用 OutputDebugString 而不是流式传输到 stderr 的选项，一个不错的解决方案是将 stderr 输出捕获到文件中。但是，该应用程序作为 Windows 服务运行。
Anyone know how I could redirect stderr to a file for an application running as a service?
任何人都知道如何将 stderr 重定向到作为服务运行的应用程序的文件？
edit
编辑
I'm hoping not to have to modify any more of the service source code than I already have. Options in the service configuration would be ideal.
我希望不必修改比我已有的更多的服务源代码。服务配置中的选项将是理想的。
采纳答案by Naaff
Can you try manually redirecting stderr?
您可以尝试手动重定向 stderr 吗？
FILE* stderr_redirect = freopen( "C:/stderr.log", "w", stderr );
// Code that writes to stderr
fclose( stderr_redirect );Edit:
编辑：
There is no way to redirect stdout or stderr for a service other than to handle those streams inside your service yourself. Some services provide an option to redirect these messages to a file. You could either temporarily redirect these streams or add an option to your service to make it configurable next time you have a problem.
除了自己在服务中处理这些流之外，没有办法为服务重定向 stdout 或 stderr。某些服务提供了将这些消息重定向到文件的选项。您可以临时重定向这些流，也可以向您的服务添加一个选项，使其在下次遇到问题时可配置。
回答by Michael
If you are modifying the code to the service, you could call SetStdHandlein your ServiceMain:
如果您要修改服务的代码，则可以在 ServiceMain 中调用SetStdHandle：
SetStdHandle(STD_ERROR_HANDLE, logFileHandle);
