转到建立命令行参数：打开NUL：找不到指定的文件

Question

I'm in trouble, when I try to launch any .go app I have this error:

C:\Go12\test>go run cmp.go
go build command-line-arguments: open NUL: Can not find the specified file.

C:\Go12\test>go env
set GOARCH=386
set GOBIN=C:\going\bin\
set GOCHAR=8
set GOEXE=.exe
set GOHOSTARCH=386
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\going\
set GORACE=
set GOROOT=C:\Go12
set GOTOOLDIR=C:\Go12\pkg\tool\windows_386
set TERM=dumb
set CC=gcc
set GOGCCFLAGS=-g -O2 -m32
set CXX=g++
set CGO_ENABLED=0

What am I doing wrong? Hope for your help, thanks.

Answer 1

It looks like your GOPATH is set to C:\going, but your actual code is in C:\Go12\test. The GOPATH variable is supposed to be the root of your workspace, and your code should be in a subdirectory of $GOPATH\src.

Try putting your .go file in C:\going\src\test and try again. Also make sure that cmp.go says package main for its package declaration or go run won't work properly.

In addition to the above, make sure you're in the same directory as cmp.go when you use go run.

See How to write Go Code for more information on the Go workspace and environment variable setup.