Go：连接文件内容

huangapple
go评论124阅读模式
英文:

Go : concatenate file contents

问题

我目前正在学习如何使用Go（或golang）进行开发，我遇到了一个奇怪的问题：

我试图创建一个脚本，查找HTML文件中的所有**<script>**标签的源代码。
脚本的目标是合并所有获取到的文件。

以下是我的脚本：

  1. //打开主文件
  2. mainFilePath := "/path/to/my/file.html"
  3. mainFileDir := path.Dir(mainFilePath)+"/"
  4. 	
  5. mainFileContent, err := ioutil.ReadFile(mainFilePath)
  7. if err == nil {
  8. 	mainFileContent := string(mainFileContent)
  9. 	var finalFileContent bytes.Buffer
  10. 		
  11. 	//开始使用正则表达式搜索JavaScript src
  12. 	scriptReg, _ := regexp.Compile("<script src=\"(.*)\">")
  13. 	scripts := scriptReg.FindAllStringSubmatch(mainFileContent,-1)
  14. 		
  15. 	//对于每个找到的SRC...
  16. 	for _, path := range scripts {
  17. 		//我们打开相应的文件
  18. 		subFileContent, err := ioutil.ReadFile(mainFileDir+path[1])
  19. 			
  20. 		if err == nil {
  21. 			//并将其内容添加到“final”变量中
  22. 			fmt.Println(finalFileContent.Write(subFileContent))
  23. 		} else {
  24. 			fmt.Println(err)
  25. 		}
  26. 	}
  27. 		
  28. 	//尝试显示最终结果
  29. 	// fmt.Println(finalFileContent.String())
  30. 	fmt.Printf(">>> %#v", finalFileContent)
  31.     fmt.Println("Y U NO WORKS? :'(")
  32. 	
  33. } else {
  34. 	fmt.Println(err)
  35. }

所以，每个fmt.Println(finalFileContent.Write(subFileContent))显示类似于**6161 <nil>**的内容，所以我认为*Write()*方法被正确执行。

但是fmt.Printf(">>> %#v", finalFileContent)没有显示任何内容。绝对没有任何内容（甚至没有显示“>>>”！）上面的注释行也是一样的情况。

有趣的是，字符串*"Y U NO WORK ? :'(*正确显示...

你知道为什么吗？
你知道如何解决这个问题吗？

提前感谢！

英文:

I'm currently learning how to develop with Go (or golang) and I have a strange issue:

I try to create a script looking inside an HTML file in order to get all the sources of each <script> tags.
The goal of the script is to merge all the retrieved files.

So, that's for the story: for now, I'm able to get the content of each JavaScript files but... I can't concatenate them...

You can see below my script:

  1. //Open main file
  2. mainFilePath := &quot;/path/to/my/file.html&quot;
  3. mainFileDir := path.Dir(mainFilePath)+&quot;/&quot;
  4. 	
  5. mainFileContent, err := ioutil.ReadFile(mainFilePath)
  7. if err == nil {
  8. 	mainFileContent := string(mainFileContent)
  9. 	var finalFileContent bytes.Buffer
  10. 		
  11. 	//Start RegExp searching for JavaScript src
  12. 	scriptReg, _ := regexp.Compile(&quot;&lt;script src=\&quot;(.*)\&quot;&gt;&quot;)
  13. 	scripts := scriptReg.FindAllStringSubmatch(mainFileContent,-1)
  14. 		
  15. 	//For each SRC found...
  16. 	for _, path := range scripts {
  17. 		//We open the corresponding file
  18. 		subFileContent, err := ioutil.ReadFile(mainFileDir+path[1])
  19. 			
  20. 		if err == nil {
  21. 			//And we add its content to the &quot;final&quot; variable
  22. 			fmt.Println(finalFileContent.Write(subFileContent))
  23. 		} else {
  24. 			fmt.Println(err)
  25. 		}
  26. 	}
  27. 		
  28. 	//Try to display the final result
  29. 	// fmt.Println(finalFileContent.String())
  30. 	fmt.Printf(&quot;&gt;&gt;&gt; %#v&quot;, finalFileContent)
  31.     fmt.Println(&quot;Y U NO WORKS? :&#39;(&quot;)
  32. 	
  33. } else {
  34. 	fmt.Println(err)
  35. }

So, each fmt.Println(finalFileContent.Write(subFileContent)) display something like 6161 <nil>, so I assume the Write() method is correctly executed.

But fmt.Printf(&quot;&gt;&gt;&gt; %#v&quot;, finalFileContent) displays nothing. Absolutely nothing (even the ">>>" are not displayed!) And it's the same for the commented line just above.

The funny part is that the string "Y U NO WORK ? :'(" is correctly displayed...

Do you know why?
And do you know how to solve this issue?

Thanks in advance!

答案1

得分: 2

你忽略了一些错误。当你运行以下版本的代码时，你的结果是什么？

  1. package main
  3. import (
  4. 	"bytes"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"path"
  8. 	"regexp"
  9. )
  11. func main() {
  12. 	//打开主文件
  13. 	mainFilePath := "/path/to/my/file.html"
  14. 	mainFileDir := path.Dir(mainFilePath) + "/"
  16. 	mainFileContent, err := ioutil.ReadFile(mainFilePath)
  18. 	if err == nil {
  19. 		mainFileContent := string(mainFileContent)
  20. 		var finalFileContent bytes.Buffer
  22. 		//开始使用正则表达式搜索JavaScript src
  23. 		scriptReg, _ := regexp.Compile("<script src=\"(.*)\">")
  24. 		scripts := scriptReg.FindAllStringSubmatch(mainFileContent, -1)
  26. 		//对于每个找到的SRC...
  27. 		for _, path := range scripts {
  28. 			//我们打开相应的文件
  29. 			subFileContent, err := ioutil.ReadFile(mainFileDir + path[1])
  31. 			if err == nil {
  32. 				//并将其内容添加到“final”变量中
  34. 				// fmt.Println(finalFileContent.Write(subFileContent))
  35. 				n, err := finalFileContent.Write(subFileContent)
  36. 				fmt.Println("finalFileContent Write:", n, err)
  38. 			} else {
  39. 				fmt.Println(err)
  40. 			}
  41. 		}
  43. 		//尝试显示最终结果
  44. 		// fmt.Println(finalFileContent.String())
  46. 		// fmt.Printf(">>> %#v", finalFileContent)
  47. 		n, err := fmt.Printf(">>> %#v", finalFileContent)
  48. 		fmt.Println()
  49. 		fmt.Println("finalFileContent Printf:", n, err)
  51. 		fmt.Println("Y U NO WORKS? :'(")
  53. 	} else {
  54. 		fmt.Println(err)
  55. 	}
  56. }

更新：

语句：

  1. fmt.Println("finalFileContent Printf:", n, err)

输出：

  1. finalFileContent Printf: 0 write /dev/stdout: winapi error #8

或者

  1. finalFileContent Printf: 0 write /dev/stdout: Not enough storage is available to process this command.

来自MSDN：

> ERROR_NOT_ENOUGH_MEMORY
>
> 8 (0x8)
>
> Not enough storage is available to process this command.

格式化的输出超出了Windows控制台的缓冲区（约64KB）。

这是一个相关的Go开放问题：

> Issue 3376: windows: detect + handle console in os.File.Write

英文:

You are ignoring some errors. What are your results when you run the following version of your code?

  1. package main
  3. import (
  4. 	&quot;bytes&quot;
  5. 	&quot;fmt&quot;
  6. 	&quot;io/ioutil&quot;
  7. 	&quot;path&quot;
  8. 	&quot;regexp&quot;
  9. )
  11. func main() {
  12. 	//Open main file
  13. 	mainFilePath := &quot;/path/to/my/file.html&quot;
  14. 	mainFileDir := path.Dir(mainFilePath) + &quot;/&quot;
  16. 	mainFileContent, err := ioutil.ReadFile(mainFilePath)
  18. 	if err == nil {
  19. 		mainFileContent := string(mainFileContent)
  20. 		var finalFileContent bytes.Buffer
  22. 		//Start RegExp searching for JavaScript src
  23. 		scriptReg, _ := regexp.Compile(&quot;&lt;script src=\&quot;(.*)\&quot;&gt;&quot;)
  24. 		scripts := scriptReg.FindAllStringSubmatch(mainFileContent, -1)
  26. 		//For each SRC found...
  27. 		for _, path := range scripts {
  28. 			//We open the corresponding file
  29. 			subFileContent, err := ioutil.ReadFile(mainFileDir + path[1])
  31. 			if err == nil {
  32. 				//And we add its content to the &quot;final&quot; variable
  34. 				// fmt.Println(finalFileContent.Write(subFileContent))
  35. 				n, err := finalFileContent.Write(subFileContent)
  36. 				fmt.Println(&quot;finalFileContent Write:&quot;, n, err)
  38. 			} else {
  39. 				fmt.Println(err)
  40. 			}
  41. 		}
  43. 		//Try to display the final result
  44. 		// fmt.Println(finalFileContent.String())
  46. 		// fmt.Printf(&quot;&gt;&gt;&gt; %#v&quot;, finalFileContent)
  47. 		n, err := fmt.Printf(&quot;&gt;&gt;&gt; %#v&quot;, finalFileContent)
  48. 		fmt.Println()
  49. 		fmt.Println(&quot;finalFileContent Printf:&quot;, n, err)
  51. 		fmt.Println(&quot;Y U NO WORKS? :&#39;(&quot;)
  53. 	} else {
  54. 		fmt.Println(err)
  55. 	}
  56. }

UPDATE:

The statement:

  1. fmt.Println(&quot;finalFileContent Printf:&quot;, n, err)

Outputs:

  1. finalFileContent Printf: 0 write /dev/stdout: winapi error #8

or

  1. finalFileContent Printf: 0 write /dev/stdout: Not enough storage is available to process this command.

From MSDN:

> ERROR_NOT_ENOUGH_MEMORY
>
> 8 (0x8)
>
> Not enough storage is available to process this command.

The formatted output to the Windows console overflows the buffer (circa 64KB).

There is a related Go open issue:

> Issue 3376: windows: detect + handle console in os.File.Write

huangapple
  • 本文由 发表于 2012年8月3日 04:53:21
  • 转载请务必保留本文链接：https://go.coder-hub.com/11785590.html
  • concatenation
  • file
  • go
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