EXIF 中无法获取俄语字母

发布于 2024-12-20 23:15:22 字数 840 浏览 3 评论 0原文

示例 1 - 它有效

NSString *first = @"Russian letters(Русские буквы)";
[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

示例 2 - 无效

NSString *rus = @"Русские буквы";
NSString *first;
first = [[NSString alloc] initWithFormat:@"Russian letters(%@)",rus]; 

[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

在 EXIF 中的第二种情况下写“俄语字母(????????? ??????)” 如果 NSString 包含参数，则会发生这种情况。如何使用带有参数的 NSString 获得正确的俄语字母？

也许问题是字典的下一个保存？

[exifDictionary setValue:[NSString stringWithFormat:@"Russian letters(%@)",rus]  forKey:(NSString*)kCGImagePropertyExifUserComment];

或者

[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

原文

example 1 - it works

NSString *first = @"Russian letters(Русские буквы)";
[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

example 2 - doesn't work

NSString *rus = @"Русские буквы";
NSString *first;
first = [[NSString alloc] initWithFormat:@"Russian letters(%@)",rus]; 

[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

In second case in EXIF write "Russian letters(??????? ?????)"
if NSString contains parameter its happens.
how can I get correct russian letters use NSString with parameter?

maybe problem is the next saving at dictionary?

[exifDictionary setValue:[NSString stringWithFormat:@"Russian letters(%@)",rus]  forKey:(NSString*)kCGImagePropertyExifUserComment];

[exifDictionary setValue:first  forKey:(NSString*)kCGImagePropertyExifUserComment];

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戏剧牡丹亭 2024-12-27 23:15:22

在代码中使用 UTF8 硬编码字符串并不安全。
请参阅苹果关于格式化字符串对象。

我想您可以使用该代码作为解决方法：

NSString *rus = @"Русские буквы";
NSString *formatString = [NSString initWithUTF8String:"Russian letters(%@)"];
NSString *first = [[NSString alloc] initWithFormat:formatString, rus];

或者如果这也不起作用，那么您始终可以使用纯 C 来执行格式化：

NSString *rus = @"Русские буквы";
char buffer[128];
snprintf(buffer, 128, "Russian letters(%s)", [rus cStringUsingEncoding:NSUTF8Encoding]);
NSString *first = [[NSString alloc] initWithUTF8String:buffer];

Using UTF8 hard-coded strings in code isn't safe.
See apple's article about Formatting String Objects.

I suppose that you can use that code as workaround:

NSString *rus = @"Русские буквы";
NSString *formatString = [NSString initWithUTF8String:"Russian letters(%@)"];
NSString *first = [[NSString alloc] initWithFormat:formatString, rus];

Or if that doesn't work either, so, you can always use plain C to perform formatting:

NSString *rus = @"Русские буквы";
char buffer[128];
snprintf(buffer, 128, "Russian letters(%s)", [rus cStringUsingEncoding:NSUTF8Encoding]);
NSString *first = [[NSString alloc] initWithUTF8String:buffer];

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