字节数组到 NSData

问题描述

WebService JSON 响应即将到来.在响应中，图像以字节数组的形式出现.我必须在 UIImageView 中显示图像.我正在尝试将字节数组转换为 NSData.但不知道如何做到这一点.任何帮助，将不胜感激.我相信字节数组中包含图像数据.示例字节数组供您参考:

In a WebService JSON response is coming. In the response, there is image is coming as a byte array. I have to show the image in a UIImageView. I am trying to convert the byte array to NSData. But not getting how to do that. Any help would be appreciated.I am confident that the byte array has image data in it.Sample Byte array for your reference:

        (137,
        80,
        78,
        71,
        ...
        66,
        96,
        130)

谢谢

推荐答案

您必须先将 JSON 转换为字符串数组；例如，您可以使用 NSJSONSerialization 班级:

You have to convert the JSON to an array of strings first; you can, for example, use the NSJSONSerialization class:

NSArray *strings = [NSJSONSerialization JSONObjectWithData:theJSONString options:kNilOptions error:NULL];

然后遍历字符串数组，将每个条目转换为整数，并将其添加到分配的字节指针/数组中:

Then walk the strings array, convert each entry to an integer, and add it to an allocated byte pointer/array:

unsigned c = strings.count;
uint8_t *bytes = malloc(sizeof(*bytes) * c);

unsigned i;
for (i = 0; i < c; i++)
{
    NSString *str = [strings objectAtIndex:i];
    int byte = [str intValue];
    bytes[i] = byte;
}

然后最后从字节中生成一个 NSData，然后使用它初始化一个 UIImage 对象:

Then finally make an NSData out of the bytes, then init an UIImage object using it:

NSData *imageData = [NSData dataWithBytesNoCopy:bytes length:c freeWhenDone:YES];
UIImage *image = [UIImage imageWithData:imageData];

这篇关于字节数组到 NSData的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！