Objective-C 将 byte[] 转换为 NSData

Question

我有来自网络服务的字节[]数据，看起来像这样（这只是它的一小部分）：

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

我想做的是将这个 byte[] 数据放入一个 NSData 变量中，这样我就可以保存这个 PDF 文件并在我的应用程序上显示。

这是我试过的：

 NSArray *byteArray = [dataSource.areaData GetPDFFileData:[NSString stringWithFormat:@"%@",@""]];

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

        unsigned i;
        for (i = 0; i < c; i++)
        {
            NSString *str = [byteArray objectAtIndex:i];
            int byte = [str intValue];
            bytes[i] = (uint8_t)byte;
        }

        NSData* data = [NSData dataWithBytes:(const void *)bytes length:sizeof(unsigned char)*c];

但是我得到这个错误

-[__NSCFDictionary intValue]: unrecognized selector sent to instance 0x17eb28e0

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary intValue]: unrecognized selector sent to instance 0x17eb28e0'

这条线

int byte = [str intValue];

我该如何解决这个问题？我的 byte[] 数据或我转换它的方式有问题吗？

下面是 byteArray

中内容的图像

这是我从网络服务

获取字节[]的调用

-(NSArray *)GetPDFFileData:(NSString *)y
{
    NSString *FileBrowserRequestString = [NSString stringWithFormat:@"%@?y=%@",kIP,y];
    NSURL *JSONURL = [NSURL URLWithString:FileBrowserRequestString];
    NSURLResponse* response = nil;
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:JSONURL];
    NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
    if(data == nil)
        return nil;
    NSError *myError;
    NSArray *tableArray = [[NSArray alloc]initWithArray:[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&myError]];
    return tableArray;
}

Answer 1

您有一个字典对象数组，其中 "data" 元素包含看起来像 base-64 编码字节数组的内容。

// Untested
NSArray *array = [dataSource.areaData GetPDFFileData:@""];
for (NSDictionary *dict in array) {
    NSString *base64 = dict[@"data"];
    NSData *data = [[NSData alloc] initWithBase64EncodedString:base64
                                                       options:0];
    // Do something with data?
}

Objective-C 将 byte[] 转换为 NSData

Objective-C Convert byte[] to NSData

byte

objective-c