如何将UIImage序列化为JSON？ [英] How to serialize UIImage to JSON?

问题描述

我正在使用

imageData = UIImagePNGRepresentation（imgvw.image）;

并且在发布时

[dic setObject:imagedata forKey:@"image"]; 

NSData * data = [NSJSONSerialization dataWithJSONObject：dic选项：NSJSONWritingPrettyPrinted错误：& theError];

现在应用程序崩溃终止应用程序由于未捕获的异常' NSInvalidArgumentException '，原因：'JSON写入中的类型无效（NSConcreteMutableData）

now app is crashing Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid type in JSON write (NSConcreteMutableData)

推荐答案

您需要将UIImage转换为NSData，然后将该NSData转换为NSString，它将是您数据的base64字符串表示形式。

You need to convert your UIImage to NSData and then convert that NSData to a NSString which will be base64 string representation of your data.

从NSData *获得NSString *后，您可以在密钥@image将其添加到您的字典中

Once you get the NSString* from NSData*, you can add it to your dictionary at key @"image"

要将NSData转换为base64类型NSString *，请参阅以下链接：
如何在iphone-sdk上进行base64编码？

To convert NSData to a base64 type NSString* refer to the following link: How do I do base64 encoding on iphone-sdk?

以更伪的方式处理看起来像这样

In a more pseudo-way the process will look like this

UIImage *my_image; //your image handle
NSData *data_of_my_image = UIImagePNGRepresentation(my_image);
NSString *base64StringOf_my_image = [data_of_my_image convertToBase64String];

//now you can add it to your dictionary
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:base64StringOf_my_image forKey:@"image"];

if ([NSJSONSerialization isValidJSONObject:dict]) //perform a check
{
        NSLog(@"valid object for JSON");
        NSError *error = nil;
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];


        if (error!=nil) {
            NSLog(@"Error creating JSON Data = %@",error);
        }
        else{
            NSLog(@"JSON Data created successfully.");
        }
}
else{
        NSLog(@"not a valid object for JSON");
    }

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