图像 Base64 未在 JSON 请求中正确发送

Posted 2023-03-16

【中文标题】图像 Base64 未在 JSON 请求中正确发送

【英文标题】：Image Base64 not getting Sent Correctly in JSON Request

【发布时间】：2013-05-08 06:17:05

【问题描述】：

我正在将 JSON POST 请求中的 base64 图像发送到 php 服务器。响应来了。但是空格被添加到 base64 字符串中。所以当我尝试解码base64时，它失败了。无法理解问题出在哪里。我正在开发一个 iPad 应用程序并从 iPad 模拟器发送请求。

如果您对可能出现的问题有丝毫了解，请告诉我。非常感谢。

以下是我用于发送请求的 ASIRequest 代码 -

ASIFormDataRequest *asiRequest = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:urlForAPI]];
[asiRequest setTimeOutSeconds:200];

NSMutableDictionary *requestheaders =[[[NSMutableDictionary alloc]init] autorelease];
[requestheaders setValue:@"application/x-www-form-urlencoded; charset=utf-8" forKey:@"Content-Type"];

NSData *jsonData = [data JSONData];

NSString *string = [[[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding] autorelease];
[asiRequest setRequestHeaders:requestheaders];
NSString *jsonString = [NSString stringWithFormat:@"REQUEST=%@",string];

NSData *requestData = [NSData dataWithBytes:[jsonString UTF8String] length:[jsonString length]];

[asiRequest setPostBody:[NSMutableData dataWithData:requestData]];

[asiRequest setShouldContinueWhenAppEntersBackground:YES];
[asiRequest setDelegate:self];

[asiRequest setRequestMethod:@"POST"];
[asiRequest setDidFailSelector:@selector(uploadFailed:)];
[asiRequest setDidFinishSelector:@selector(uploadFinished:)];

[asiRequest startSynchronous];

【问题讨论】：

我们能看到一个发布请求的例子以及服务器正在接收什么吗？ var_dump($_POST).

@SAMIRRATHOD 我已经用代码更新了问题。请检查。

【参考方案1】：

试试这个

它在顶部声明：

   static const char _base64EncodingTable[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /Write this code when you pass the string.
         NSData *imageData =  UIImagePNGRepresentation(YourImageView.image);
         NSString *imageString = [self encodeBase64WithData:imageData];

  //  only pass this imageStirng using NSUTF8StringEncoding instead of UTF8String

没有其他参数只是检查图像是否上传。它对我有用。

   YourUrl= [[YourUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] dataUsingEncoding:NSUTF8StringEncoding]



    - (NSString *)encodeBase64WithData:(NSData *)objData 
        const unsigned char * objRawData = [objData bytes];
        char * objPointer;
        char * strResult;

        // Get the Raw Data length and ensure we actually have data
        int intLength = [objData length];
        if (intLength == 0) return nil;

        // Setup the String-based Result placeholder and pointer within that placeholder
        strResult = (char *)calloc((((intLength + 2) / 3) * 4) + 1, sizeof(char));
        objPointer = strResult;

        // Iterate through everything
        while (intLength > 2)  // keep going until we have less than 24 bits
            *objPointer++ = _base64EncodingTable[objRawData[0] >> 2];
            *objPointer++ = _base64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
            *objPointer++ = _base64EncodingTable[((objRawData[1] & 0x0f) << 2) + (objRawData[2] >> 6)];
            *objPointer++ = _base64EncodingTable[objRawData[2] & 0x3f];

            // we just handled 3 octets (24 bits) of data
            objRawData += 3;
            intLength -= 3;
        

        // now deal with the tail end of things
        if (intLength != 0) 
            *objPointer++ = _base64EncodingTable[objRawData[0] >> 2];
            if (intLength > 1) 
                *objPointer++ = _base64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
                *objPointer++ = _base64EncodingTable[(objRawData[1] & 0x0f) << 2];
                *objPointer++ = '=';
             else 
                *objPointer++ = _base64EncodingTable[(objRawData[0] & 0x03) << 4];
                *objPointer++ = '=';
                *objPointer++ = '=';
            
        

        // Terminate the string-based result
        *objPointer = '\0';

        // Return the results as an NSString object
        return [NSString stringWithCString:strResult encoding:NSASCIIStringEncoding];
    

它可以帮助你。并且在服务器上获取图像可能存在问题。