运行从Haskell项目构建的exe文件时，停止打开命令提示符 [英] Stop command prompt from opening when running exe file built from haskell project

问题描述

我创建了一个小应用程序，该应用程序将光泽度库用于GUI.当键入"cabal run [cabal file]"时，该项目已构建并运行，并且仅提示GUI.相反，当我单击从生成生成的.exe文件时，GUI会打开，但命令提示符也会打开.我想停止命令提示符的打开，而只打开光泽窗口.

I have created a small application that uses the gloss library for a GUI. When typing "cabal run [cabal file]" the project is built and run, and only prompts the GUI. When I instead go and click on the .exe file that was generated from the build, the GUI opens but so does the command prompt. I want to stop the command prompt from opening and only have the window from gloss open.

推荐答案

默认情况下，Windows GHC会构建控制台程序，如果尚未打开命令提示符终端，则会打开该命令提示符终端.如果要构建仅GUI的程序，可以通过将 -optl -mwindow 标志赋予GHC来将 -mwindow 传递给链接器.如果您使用Cabal，则可以将此标志添加到可执行文件节中的 ghc-options 字段中.

By default on Windows GHC builds console programs, which open a Command Prompt terminal if one isn’t open already. If you want to build a GUI-only program, you can pass -mwindow to the linker by giving the -optl -mwindow flag to GHC. If you’re using Cabal, you would add this flag to the ghc-options field in the executable stanza.

请注意，如果使用此标志，则程序将没有任何 stdin ， stdout 或 stderr 文件句柄，因此应采取类似操作 putStrLn ， print 和 getLine 将不起作用，因为它们等效于 hPutStrLn stdout ，hPrint stdout 和 hGetLine stdin .如果您想进行任何日志记录或打印，则需要自己打开一个句柄(例如，文件，终端或带有读取另一端的另一个程序的套接字)；但是，如果您需要临时跟踪进行调试，则 Debug.Trace 仍然可以使用.

Beware that if you use this flag, your program will not have any stdin, stdout, or stderr file handles, so actions like putStrLn, print, and getLine will not work, since they’re equivalent to hPutStrLn stdout, hPrint stdout, and hGetLine stdin. If you want to do any logging or printing, you’ll need to open a handle yourself (e.g. a file, terminal, or socket with another program reading the other end); however, Debug.Trace will still work if you need temporary tracing for debugging.

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