我有以下有效的代碼，但這里的要點是我想將一個任意長度的數組注入或插入到另一個擴展其長度的靜態大小的數組中：package mainimport ( "fmt")func main() { ffmpegArguments := []string{ "-y", "-i", "invideo", // ffmpegAudioArguments..., "-c:v", "copy", "-strict", "experimental", "outvideo", } var outputArguments [12]string copy(outputArguments[0:3], ffmpegArguments[0:3]) copy(outputArguments[3:7], []string{"-i", "inaudio", "-c:a", "aac"}) copy(outputArguments[7:12], ffmpegArguments[3:8]) fmt.Printf("%#v\n", ffmpegArguments) fmt.Printf("%#v\n", outputArguments)}https://play.golang.org/p/peQXkOpheK4
3 回答
慕容708150
TA貢獻1831條經驗 獲得超4個贊
講優雅有些自以為是，但可以提出KISS原則。順便說一句，您可以對切片使用更簡單的方法，不需要您猜測輸出數組的大小：
func inject(haystack, pile []string, at int) []string {
? ? result := haystack[:at]
? ? result = append(result, pile...)
? ? result = append(result, haystack[at:]...)
? ? return result
}
并且，按如下方式重寫您的代碼：
ffmpegArguments := []string{
? ? "-y",
? ? "-i", "invideo",
? ? "-c:v", "copy",
? ? "-strict", "experimental",
? ? "outvideo",
}
outputArguments := inject(ffmpegArguments, []string{"-i", "inaudio", "-c:a", "aac"}, 3)
fmt.Printf("%#v\n", ffmpegArguments)
fmt.Printf("%#v\n", outputArguments)
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
由于您要附加到輸出，我建議這樣做（簡單且一致）并設置最大容量：
out := make([]string, 0, 12)
out = append(out, in[0:3]...)
out = append(out, []string{"-i", "inaudio", "-c:a", "aac"}...)
out = append(out, in[3:8]...)
看：
package main
import (
"fmt"
)
func main() {
in := []string{
"-y",
"-i", "invideo",
// ffmpegAudioArguments...,
"-c:v", "copy",
"-strict", "experimental",
"outvideo",
}
out := make([]string, 0, 12)
out = append(out, in[0:3]...)
out = append(out, []string{"-i", "inaudio", "-c:a", "aac"}...)
out = append(out, in[3:8]...)
fmt.Println(in)
fmt.Println(out)
}
結果：
[-y -i invideo -c:v copy -strict experimental outvideo]
[-y -i invideo -i inaudio -c:a aac -c:v copy -strict experimental outvideo]
HUX布斯
TA貢獻1876條經驗 獲得超6個贊
看起來第一個賦值指向 haystack 數組，隨后的步驟修改了切片haystack：
// arrayInject is a helper function written by Alirus on StackOverflow in my
// inquiry to find a way to inject one array into another _elegantly_:
func arrayInject(haystack, pile []string, at int) (result []string) {
? ? result = make([]string, len(haystack[:at]))
? ? copy(result, haystack[:at])
? ? result = append(result, pile...)
? ? result = append(result, haystack[at:]...)
? ? return result
}
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