英文:
Empty slice returned
问题
相当新手在学习Go语言。我试图读取目录和子目录中的所有文件，将它们存储在一个切片中，然后进行进一步处理。以下是代码（主要关注Main和expandDirectory函数）：
package main
import (
"fmt"
"io/ioutil"
"os"
)
const dirname string = "MyDirectory"
func check(e error) {
if e != nil {
panic(e)
}
}
func expandDirectory(currentDirectory string, allFiles []os.FileInfo) []os.FileInfo {
files, e := ioutil.ReadDir(currentDirectory)
check(e)
for _, internalDir := range files {
switch mode := internalDir.Mode(); {
case mode.IsDir():
var filepath = currentDirectory + internalDir.Name() + "\\"
expandDirectory(filepath, allFiles)
case mode.IsRegular():
allFiles = append(allFiles, internalDir)
}
}
return allFiles
}
func main() {
allFiles := expandDirectory(dirname, make([]os.FileInfo, 5))
fmt.Printf("%v", cap(allFiles))
}
最后的打印输出将会是初始值5。
只是提醒一下，expandDirectory函数是一个递归函数，用于处理目录，并在处理文件时添加文件引用。
感谢您的帮助。我在哪里出错了？
最终代码（仅更改部分）：
func main() {
allFiles := expandDirectory(dirname)
}
func expandDirectory(currentDirectory string) []os.FileInfo {
allFiles := make([]os.FileInfo, 0, 5)
// ...
case mode.IsDir():
// ...
allFiles = append(allFiles, expandDirectory(filepath)...)
// ...
return allFiles
}
以上是翻译好的内容，请查阅。
英文:
Fairly new at go.
I am trying to basically read all the files in directory and subdirectory, populate in a slice and then process further.
Here is the code (Main functions to look are Main and expandDirectory
package main
import (
"fmt"
"io/ioutil"
"os"
)
const dirname string = "MyDirectory"
func check(e error) {
if e != nil {
panic(e)
}
}
func expandDirectory(currentDirectory string, allFiles []os.FileInfo) []os.FileInfo {
files, e := ioutil.ReadDir(currentDirectory)
check(e)
for _, internalDir := range files {
switch mode := internalDir.Mode(); {
case mode.IsDir():
var filepath = currentDirectory + internalDir.Name() + "\\"
expandDirectory(filepath, allFiles)
case mode.IsRegular():
allFiles = append(allFiles, internalDir)
}
}
return allFiles
}
func main() {
allFiles := expandDirectory(dirname, make([]os.FileInfo, 5))
fmt.Printf("%v", cap(allFiles))
}
The final print will print 5 which is the initial value.
Just FYI, the expandDirectory function is just recursive function in case of directories and adding the file reference in case of a file.
Thanks for the help
Where am I going wrong
FINAL CODE (changes Only) <br>
func main() {
allFiles := expandDirectory(dirname)
}
func expandDirectory(currentDirectory string) []os.FileInfo {
allFiles := make([]os.FileInfo, 0, 5)
....
case mode.IsDir():
....
allFiles = append(allFiles, expandDirectory(filepath)...)
....
return allFiles
}
答案1
得分: 0
你需要将结果附加到其中：
allFiles = append(allFiles, expandDirectory(filepath, allFiles)...)
另外，
allFiles := expandDirectory(dirname, make([]os.FileInfo, 5))
应该改为：
allFiles := expandDirectory(dirname, make([]os.FileInfo, 0, 5))
否则，你将会向allFiles附加内容，而前5个项目将为空。
英文:
You need to append the result to it:
allFiles = append(allFiles, expandDirectory(filepath, allFiles)...)
Also
allFiles := expandDirectory(dirname, make([]os.FileInfo, 5))
should be:
allFiles := expandDirectory(dirname, make([]os.FileInfo, 0, 5))
Otherwise you will be appending to allFiles and the first 5 items will be empty.
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