英文:
Golang runtime error when getting file absolute path
问题
我几乎解决了一个问题，这个问题困扰着我，因为我对Golang还不熟悉。我基本上是想在os.open方法中获取文件的绝对路径。我尝试了各种方法，但都没有成功。
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()
absolute_path := string(filepath.Abs(header.Filename))
// 我想在os.Open中获取绝对路径
file, err := os.Open(absolute_path)
}
例如，如果我在os.Open中硬编码字符串，如**/Users/Documents/pictures/cats.jpg**，那么文件上传成功。但是，当我尝试获取绝对路径并将其放入os.Open中时，运行时会出现错误multiple-value filepath.Abs() in single-value context。是否有其他方法可以获取文件的路径，以便我可以将其放入该方法中？
英文:
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 ?
答案1
得分: 2
根据文档的说明，Abs函数将返回两个值，一个是字符串，一个是错误。
因此，你不能这样写：
absolute_path := string(filepath.Abs(header.Filename))
而应该这样写：
absolute_path, err := filepath.Abs(header.Filename)
另外请注意，absolute_path已经是一个字符串。
英文:
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.
答案2
得分: 2
这行代码的编译错误（multiple-value filepath.Abs() in single-value context）告诉你filepath.Abs返回了多个参数，而string只接受一个参数。
filepath.Abs返回一个string和一个error。
正确的代码应该是：
ap, err := filepath.Abs(header.Filename)
if err != nil {
// 处理错误
}
英文:
The compiler error from this line of code (multiple-value filepath.Abs() in single-value context)
absolue_path := string(filepath.Abs(header.Filename))
is telling you that filepath.Abs is returning multiple arguments and string only takes one argument.
filepath.Abs returns a string and error
Code should be:
ap, err := filepath.Abs(header.Filename)
if err != nil {
// handle error
}
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