NSMutableURLRequest setHTTPBody

Question

我从一个不同的问题中提取了这段代码，我的脚本文件有更多的输入，而不仅仅是mydata，而且进入mydata的数据不应该是静态文本，它应该来自NSString。

所以我的问题是，我如何将多个数据片段发布到我的脚本中，以及如何从NSString输入值，因为我的理解是，我不能将NSStrings与c数据类型一起使用。我不确定这是不是正确的术语，所以如果我错了，请纠正我。

const char *bytes = "mydata=Hello%20World";

NSURL *url = [NSURL URLWithString:@"http://www.mywebsite.com/script.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];
[request setHTTPBody:[NSData dataWithBytes:bytes length:strlen(bytes)]];

NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
//NSString *responseString = [[NSString alloc] initWithFormat:@"%@", responseData];
NSLog(@"responseData: %@", responseData);

userData = responseData;

使用下面的答案创建新问题

NSMutableData *data = [NSMutableData data]; 

NSString *number = numberIB.text;
NSString *name = nameIB.text;

NSString *nameString = [[NSString alloc] initWithFormat:@"name=", name];
NSString *numberString = [[NSString alloc] initWithFormat:@"number=", number];

NSLog(nameString);
NSLog(numberString);

[data appendData:[nameString dataUsingEncoding:NSUTF8StringEncoding]];
[data appendData:[numberString dataUsingEncoding:NSUTF8StringEncoding]];

NSURL *url = [NSURL URLWithString:@"http://www.siteaddress.com/test.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];
//[request setHTTPBody:[NSData dataWithBytes:data length:strlen(data)]];
[request setHTTPBody:data];

NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
//NSString *responseString = [[NSString alloc] initWithFormat:@"%@", responseData];
NSLog(@"responseData: %@", responseData);

nameString和numberString的NSLogs返回name=和number=时没有任何数据。导致没有数据发送到我的脚本。

Answer 1

您可以根据需要使用NSMutableData对象来追加字节，如下所示：

NSMutableData *data = [NSMutableData data]; 
const char *bytes = "mydata=Hello%20World";
[data appendBytes:bytes length:strlen(bytes)];

//...

const char *moreBytes = "&someMoreData=Fantastic";

[data appendBytes:moreBytes length:strlen(moreBytes)];

编辑：如果要将NSString追加到数据缓冲区中，可以使用-[NSString dataUsingEncoding:]并将其传递给-appendData:

NSString *someString = @"blah";
[data appendData:[someString dataUsingEncoding:NSUTF8StringEncoding]];

[request setHTTPBody:data];