当文档是 txt 文件时，保存文档的首选项

发布于 2024-10-31 11:01:09 字数 1263 浏览 0 评论 0原文

我想知道当文档只是一个简单的 txt 文件时，如何保存文档的首选项，例如窗口大小、屏幕位置等。（我的应用程序是文本编辑器）

我想到了 NSUserDefaults 并保存文件路径，但是如果稍后在应用程序关闭时移动文件会发生什么？使用 NSUserDefaults 真的是个好主意吗？我正在寻求建议

谢谢

编辑：我将这两个方法添加到 MyDocument.m （感谢@somegeekintn @Black Frog）

//helper method that set NSWindow frame string in file system attributes
- (BOOL) _savePreferencesInFileAtURL:(NSURL *)absoluteURL{

    const char *path = [[absoluteURL path] fileSystemRepresentation];
    const char *name = [@"NSWindow frame" cStringUsingEncoding:NSUTF8StringEncoding];
    const char *frameCString = [NSStringFromRect([window frame]) cStringUsingEncoding:NSUTF8StringEncoding];

    int result = setxattr(path , name, frameCString, strlen(frameCString) + 1, 0, 0);
    return (result<0)? NO: YES;
}

//helper method that reads NSWindow frame string from file system attributes
- (BOOL) _readPreferencesInFileAtURL:(NSURL *)absoluteURL{

    const char *path = [[absoluteURL path] fileSystemRepresentation];
    const char *name = [@"NSWindow frame" cStringUsingEncoding:NSUTF8StringEncoding];
    char frameCString [50];

    ssize_t bytesRetrieved = getxattr(path, name, frameCString, 50, 0, 0); 
    //use frameCString...

    return (bytesRetrieved<0)? NO: YES; 
}

原文

I wonder how can I save preferences of a document such as window size, position in the screen, etc when this document is just a simple txt file. (My app is a Text Editor)

I thought of NSUserDefaults and save file path but what would happen if file is moved later when the app is closed? Using NSUserDefaults is really a good idea?
I am looking for advice

Thanks

EDIT:
I added these two methods to MyDocument.m (Thanks to @somegeekintn @Black Frog)

//helper method that set NSWindow frame string in file system attributes
- (BOOL) _savePreferencesInFileAtURL:(NSURL *)absoluteURL{

    const char *path = [[absoluteURL path] fileSystemRepresentation];
    const char *name = [@"NSWindow frame" cStringUsingEncoding:NSUTF8StringEncoding];
    const char *frameCString = [NSStringFromRect([window frame]) cStringUsingEncoding:NSUTF8StringEncoding];

    int result = setxattr(path , name, frameCString, strlen(frameCString) + 1, 0, 0);
    return (result<0)? NO: YES;
}

//helper method that reads NSWindow frame string from file system attributes
- (BOOL) _readPreferencesInFileAtURL:(NSURL *)absoluteURL{

    const char *path = [[absoluteURL path] fileSystemRepresentation];
    const char *name = [@"NSWindow frame" cStringUsingEncoding:NSUTF8StringEncoding];
    char frameCString [50];

    ssize_t bytesRetrieved = getxattr(path, name, frameCString, 50, 0, 0); 
    //use frameCString...

    return (bytesRetrieved<0)? NO: YES; 
}

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以酷 2024-11-07 11:01:09

您可能需要查看 setxattr 和 getxattr 来分别写入和读取文件的扩展属性。您可以在这些属性中添加您喜欢的任何内容。

int setxattr(const char *path, const char *name, void *value, size_t size, u_int32_t position, int options);
ssize_t getxattr(const char *path, const char *name, void *value, size_t size, u_int32_t position, int options);

setxattr手册页

You may want to take a look at setxattr and getxattr to write and read a file's extended attributes respectively. You can put pretty much whatever you like in these attributes.

int setxattr(const char *path, const char *name, void *value, size_t size, u_int32_t position, int options);
ssize_t getxattr(const char *path, const char *name, void *value, size_t size, u_int32_t position, int options);

setxattr man page

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