如何防止BOM从Perforce unicode文件中删除 [英] How to keep BOM from removal from Perforce unicode files

问题描述

我已将具有.NET和SQL源的整个分支转换为具有BOM表的 UTF-8 ，并在同一操作中将其Perforce文件类型更改为 Unicode . (编码上的差异可能令人困惑，但是在Perforce中， Unicode 文件类型表示UTF-8文件的内容.)但是后来我发现Perforce默默地从UTF-8文件中消除了BOM标记.是否可以将Perforce设置为在 Unicode 文件类型的文件中保留UTF-8 BOM标记?我找不到记录.

I have converted entire branch with .NET and SQL sources to UTF-8 with BOM, having their Perforce file type changed to Unicode in the same operation. (Encoding difference might sound confusing, but in Perforce, Unicode file type denotes UTF-8 file content.) But later I have found out that Perforce silently elliminates BOM marker from UTF-8 files. Is it possible to set Perforce to keep UTF-8 BOM markers in files of Unicode file type? I can't find it documented.

Perforce服务器已切换为 Unicode 模式，连接编码为 UTF-8 ，没有BOM(但使用BOM将其更改为 UTF-8 没什么区别.)

Perforce server is switched to Unicode mode, connection encoding is UTF-8 no BOM (but changing it to UTF-8 with BOM doesn't make any difference).

示例:

1. 从Perforce签出源文件
2. 将文件类型更改为 Unicode
3. 将文件内容转换为带BOM的UTF-8"格式
4. 提交文件(现在文件仍将BOM保留在前3个字节中)
5. 从工作区中删除文件
6. 获取文件的最新修订版(现在文件开头不包含BOM)

1. check out a source file from Perforce
2. change file type to Unicode
3. convert file content to format "UTF-8 with BOM"
4. submit the file (now the file still keeps BOM in first 3 bytes)
5. remove the file from workspace
6. get the latest revision of the file (now the file doesn't contain BOM at the beginning)

推荐答案

好的，Hans Passant的评论鼓励我重新检查P4CHARSET，最后，答案包括两个部分:

OK, Hans Passant's comment encouraged me to re-examine P4CHARSET and finally, the answer has two parts:

对于Perforce命令行访问，设置P4CHARSET变量可控制行为.要启用将BOM添加到 Unicode 类型的文件中，请使用命令

For Perforce command line access, setting of P4CHARSET variable controls the behavior. To enable adding BOM to files of Unicode type, use command

p4 set P4CHARSET=utf8-bom

要使这些文件没有 BOM，请使用

In order to have these files without BOM, use

p4 set P4CHARSET=utf8

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对于P4V Perforce Visual Client ，可以通过菜单Connection> Choose Character Encoding...更改设置.使用值Unicode (UTF-8)启用添加BOM表，使用Unicode (UTF-8, no BOM)禁止添加BOM表.

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For P4V The Perforce Visual Client, the setting can be changed via menu Connection > Choose Character Encoding.... Use value Unicode (UTF-8) to enable adding BOM and Unicode (UTF-8, no BOM) to suppress it.

• 如果菜单项Choose Character Encoding...被禁用，请确保以下内容(然后再次检查)
  • P4V与服务器打开并正常工作
  • 包含仓库/工作区树的窗格被聚焦(在内部单击以重新确保它)
  • if menu item Choose Character Encoding... is disabled, ensure the following (and then check again)
    • P4V has connection to server open and working
    • pane containing depot/workspace tree is focused (click inside to re-ensure this)

    注释:

    • 如果您通常同时结合使用上述两种方式来访问Perforce ，则需要同时应用这两种解决方案，否则您将不断得到不同的结果
    • 如果要立即向现有文件中添加BOM表或从现有文件中删除BOM表，请调整上述设置，然后从工作区中删除文件并再次添加它们(请参见步骤 5 和问题中发布的示例的 6 ).其他更改文件内容(集成，合并等)的服务器操作也将执行类似的操作
    • 有关其他编码选项及其对BOM的影响，请参见
    • if you usually combine both above ways to access Perforce, you need to apply both solutions, otherwise you will keep getting mixed results
    • if you want to instantly add/remove BOM to/from existing files, adjust the above settings, then remove files from workspace and add them again (see steps 5 and 6 of example posted in the question). Other server actions changing content of files (integrating, merging etc.) will do the similar
    • for other encoding options and their impact on BOM, see the second table in Internationalization Notes for P4D, the Perforce Server and Perforce client applications

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