获取文件绝对路径时出现Golang运行时错误

Question

I am almost done with an issue that has stomped me as I am new to Golang, I am basically trying to get the absolute path of a file inside the os.open method. I have been trying all types of things but nothing works

  func UploadProfile(w http.ResponseWriter, r *http.Request) {
    r.ParseForm()
    infile, header, err := r.FormFile("upload_file")
    if err != nil {
        http.Error(w, "Error parsing uploaded file: "+err.Error(), http.StatusBadRequest)
        return
    }
    defer infile.Close()


       absolue_path := string(filepath.Abs(header.Filename))
                  // I want to get the absolute path in os.Open
    file, err :=  os.Open(absolute_path)
    }

for instance if I hard code the string in the os.Open like /Users/Documents/pictures/cats.jpg then the file uploads successfully . When i try to get the absolute path and put it inside the os.Open I get this error on runtime multiple-value filepath.Abs() in single-value context . Is there any other way that I can get the path of the file so that I can put it inside that method ?

Answer 1

According to documentation, Abs function will return TWO values, one string and one error.

So you can not have something like:

absolute_path := string(filepath.Abs(header.Filename))

instead, you should write:

absolute_path, err := filepath.Abs(header.Filename)

Also note that absolute_path is a string already.