英文:
Accessing array post params in golang (gin)
问题
我正在尝试访问一个由Gin（golang）编写的API中的文件和值数组。我有一个函数，它接受一个文件、高度和宽度。然后它调用函数来调整文件的大小，然后将其上传到S3。然而，我还尝试上传多个文件。
func (rc *ResizeController) Resize(c *gin.Context) {
file, header, err := c.Request.FormFile("file")
filename := header.Filename
if err != nil {
log.Fatal(err)
}
height := c.PostForm("height")
width := c.PostForm("width")
finalFile := rc.Crop(height, width, file)
go rc.Upload(filename, finalFile, "image/jpeg", s3.BucketOwnerFull)
c.JSON(200, gin.H{"filename": filename})
}
我在文档中没有找到如何访问以下格式数据的任何地方：
item[0]file
item[0]width
item[0]height
item[1]file
item[1]width
item[1]height
等等。
我想到了以下类似的解决方案：
for index, element := range c.Request.PostForm("item") {
fmt.Println(element.Height)
}
但是报错了："c.Request.Values undefined (type *http.Request has no field or method Values)"
英文:
I'm attempting to access an array of files and values posted to an API written in Gin (golang). I've got a function which takes a file, height and width. It then calls functions to resize the file, and then upload it to S3. However, I'm attempting to also upload multiple files.
func (rc *ResizeController) Resize(c *gin.Context) {
file, header, err := c.Request.FormFile("file")
filename := header.Filename
if err != nil {
log.Fatal(err)
}
height := c.PostForm("height")
width := c.PostForm("width")
finalFile := rc.Crop(height, width, file)
go rc.Upload(filename, finalFile, "image/jpeg", s3.BucketOwnerFull)
c.JSON(200, gin.H{"filename": filename})
}
I couldn't see anywhere in the docs how to access data in the following format:
item[0]file
item[0]width
item[0]height
item[1]file
item[1]width
item[1]height
etc.
I figured something along the lines of:
for index, element := range c.Request.PostForm("item") {
fmt.Println(element.Height)
}
But that threw "c.Request.Values undefined (type *http.Request has no field or method Values)"
答案1
得分: 3
你可以直接访问File切片，而不是使用Request上的FormFile方法。假设你有一个与上传文件的顺序对应的width和height的表单数组。
if err := ctx.Request.ParseMultipartForm(32 << 20); err != nil {
// 处理错误
}
for i, fh := range ctx.Request.MultipartForm.File["item"] {
// 使用fh访问文件头
w := ctx.Request.MultipartForm.Value["width"][i]
h := ctx.Request.MultipartForm.Value["height"][i]
}
Request上的FormFile方法只是MultipartForm.File的一个包装，它返回该键的第一个文件。
英文:
You can access the File slice directly instead of using the FormFile method on Request. Assuming you have a form array for width and height that correspond to the order that the files were uploaded.
if err := ctx.Request.ParseMultipartForm(32 << 20); err != nil {
// handle error
}
for i, fh := range ctx.Request.MultipartForm.File["item"] {
// access file header using fh
w := ctx.Request.MultipartForm.Value["width"][i]
h := ctx.Request.MultipartForm.Value["height"][i]
}
The FormFile method on Request is just a wrapper around MultipartForm.File that returns the first file at that key.
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