如何将多个参数发送到http post中的PHP服务器

Question

我将base64字符串发送到PHP服务器及其运行良好。现在，我想将另一个参数作为字符串发送。任何人都可以告诉我需要添加什么代码以下代码。

下面的代码对单参数有效。我们如何将其修改为多个参数？

 NSData *data = [UIImageJPEGRepresentation(imgeview.image,90) base64Encoding];

// Create your request string with parameter name as defined in PHP file
NSString *myRequestString = [NSString stringWithFormat:@"question_image=%@",data];
myRequestString = [myRequestString stringByReplacingOccurrencesOfString:
                                             @"+" withString:@"%2B"];

// Create Data from request
NSData *myRequestData = [NSData dataWithBytes:[myRequestString UTF8String] 
                                       length:[myRequestString length]];
request = [[NSMutableURLRequest alloc] initWithURL:
    [NSURL URLWithString:@"http://192.168.0.101/Mobile_tutor/webservice/question_details.php"]];
// set Request Type
[request setHTTPMethod:@"POST"];
// Set content-type
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
// Set Request Body
[request setHTTPBody:myRequestData];
// Now send a request and get Response
NSData *returnData = [NSURLConnection sendSynchronousRequest:request 
                                           returningResponse:nil 
                                                       error: nil];
// Log Response
NSString *response = [[NSString alloc] initWithBytes:[returnData bytes] 
                                              length:[returnData length]
                                            encoding:NSUTF8StringEncoding];
NSLog(@"-------------%@",response); // here you get reasponse string

Answer 1

对于网络操作，这些可以更好地支持API，例如Afnetworking可用的Witch Works async，并且更好地处理API。

afnetworking的教程

从这里到达

NSArray *keys = @[@"UserID", ];
NSArray *objects = @[@(userId)];

NSDictionary *parameter = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:
                            [NSURL URLWithString:BaseURLString]];
[httpClient setParameterEncoding:AFJSONParameterEncoding];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST"
                                                        path:@"services/UserService.svc/GetUserInfo"
                                                  parameters:parameter];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSError* error = nil;
    id jsonObject = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
    if ([jsonObject isKindOfClass:[NSDictionary class]]) {
        // do what ever
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];

Answer 2

给定 NSDictionary “参数”的键和值是字符串以及每个条目代表的位置 一 参数（名称/值）您可以定义一个助手类别：

@interface NSDictionary (FormURLEncoded)
-(NSData*) dataFormURLEncoded;
@end

dataFormURLEncoded 从字典中的给定参数返回正确编码的字符序列。

编码算法由W3C指定： URL编码的表单数据 /应用程序 / x-www-form-urlencoded编码算法

它可以实现如下：

首先，分别编码参数名称的辅助函数，分别是参数值：

static NSString* x_www_form_urlencoded_HTML5(NSString* s)
{
    // http://www.w3.org/html/wg/drafts/html/CR/forms.html#application/x-www-form-urlencoded-encoding-algorithm   , Editor's Draft 24 October 2013
    CFStringRef charactersToLeaveUnescaped = CFSTR(" ");
    CFStringRef legalURLCharactersToBeEscaped = CFSTR("!$&'()+,/:;=?@~");
    
    NSString *result = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
                                             kCFAllocatorDefault,
                                             (__bridge CFStringRef)s,
                                             charactersToLeaveUnescaped,
                                             legalURLCharactersToBeEscaped,
                                             kCFStringEncodingUTF8));
    return [result stringByReplacingOccurrencesOfString:@" " withString:@"+"];
}

最后， dataFormURLEncoded 组成编码参数的字符序列。将通过串联编码来组成“参数” name, = 并编码 value:

parameter := name "=" value

然后，参数列表将通过通过“＆”：：

parameters  := parameter ["&" parameter]

它可以如下实施：

@implementation NSDictionary (FormURLEncoded)

-(NSData*) dataFormURLEncoded {
    NSMutableData* data = [[NSMutableData alloc] init];
    BOOL first = YES;
    for (NSString* name in self) {
        @autoreleasepool {
            if (!first) {
                [data appendBytes:"&" length:1];
            }
            NSString* value = self[name];
            NSData* encodedName = [x_www_form_urlencoded_HTML5(name) dataUsingEncoding:NSUTF8StringEncoding];
            NSData* encodedValue = [x_www_form_urlencoded_HTML5(value) dataUsingEncoding:NSUTF8StringEncoding];
            
            [data appendData:encodedName];
            [data appendBytes:"=" length:1];
            [data appendData:encodedValue];
            first = NO;
        }
    }
    return [data copy];
}

@end

笔记： 字符序列使用Unicode UTF-8编码字符串。

例子：

给定参数：

NSDictionary* params = @{@"a": @"a a", @"b": @"b+b", @"c": @"ü ö"};
NSData* encodedParamData = [params dataFormURLEncoded];

现在， encodedParamData 将被添加到您的身体类型的身体中 application/x-www-form-urlencoded.

编码的参数字符串变为：

a = a+a＆b = b％2bb＆c =％c3％bc+％c3％b6