在go lang中将字符串转换为uint

Question

我试图使用以下代码将字符串转换为32位ubuntu上的uint.但是它始终在uint64中转换它,尽管在函数中明确地传递了32作为参数.下面的代码mw是图像magick库的对象.哪个和uint什么时候返回.此外,它接受resize函数中的type参数. mw.getImageWidth()mw.getImageHeight()uint

    width :=  strings.Split(imgResize, "x")[0]
    height := strings.Split(imgResize, "x")[1]

    var masterWidth uint = mw.GetImageWidth() 
    var masterHeight uint = mw.GetImageHeight() 

    mw := imagick.NewMagickWand()
    defer mw.Destroy()

    err = mw.ReadImageBlob(img)
    if err != nil {
            log.Fatal(err)
        } 

    var masterWidth uint = mw.GetImageWidth() 
    var masterHeight uint = mw.GetImageHeight()

    wd, _ := strconv.ParseUint(width, 10, 32)
    ht, _ := strconv.ParseUint(height, 10, 32)

   if masterWidth < wd || masterHeight < ht { 
     err = mw.ResizeImage(wd, ht, imagick.FILTER_BOX, 1)
     if err != nil {
        panic(err)
    } 
   }

错误是:

# command-line-arguments
test.go:94: invalid operation: masterWidth < wd (mismatched types uint and uint64)
goImageCode/test.go:94: invalid operation: masterHeight < ht (mismatched types uint and uint64)
goImageCode/test.go:100: cannot use wd (type uint64) as type uint in argument to mw.ResizeImage
goImageCode/AmazonAWS.go:100: cannot use ht (type uint64) as type uint in argument to mw.ResizeImage

Answer 1

包strconv

func ParseUint

func ParseUint(s string, base int, bitSize int) (n uint64, err error)

ParseUint就像ParseInt,但是对于无符号数.

func ParseInt

func ParseInt(s string, base int, bitSize int) (i int64, err error)

ParseInt解释给定基数(2到36)中的字符串s并返回相应的值i.如果base == 0,则字符串的前缀暗示基数:base 16表示"0x",base 8表示"0",否则表示10.

bitSize参数指定结果必须适合的整数类型.位大小0,8,16,32和64对应于int,int8,int16,int32和int64.

ParseInt返回的错误具有具体类型*NumError并包含err.Num = s.如果s为空或包含无效数字,则err.Err = ErrSyntax,返回值为0; 如果对应于s的值不能用给定大小的有符号整数表示,则err.Err = ErrRange,返回值是相应bitSize和sign的最大幅度整数.

该bitSize参数指定结果必须融入整数类型.该uint类型大小是实现定义的,32或64位.在ParseUint返回类型始终uint64.例如,

package main

import (
    "fmt"
    "strconv"
)

func main() {
    width := "42"
    u64, err := strconv.ParseUint(width, 10, 32)
    if err != nil {
        fmt.Println(err)
    }
    wd := uint(u64)
    fmt.Println(wd)
}

输出:

42