使用Objective-C发送HTTP POST数据

我有一些使用POST发送图像的代码。我想做的是在同一篇文章中发送一些文本。这就是我到目前为止所做的：

NSMutableURLRequest *photoRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:photoPostString] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[photoRequest setHTTPMethod:@"POST"];

NSString *boundary = @"---------------------------14737809831466499882746641449";
        NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[photoRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"%@.jpg\"\r\n", obsID] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[photoRequest setHTTPBody:body];

---

其工作原理是通过URL发送和接收图像。我想做的是在同一个请求中以字符串的形式发送一些其他信息，例如photoID。有可能吗？

是的，有可能。试试看

NSMutableURLRequest *photoRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:photoPostString] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[photoRequest setHTTPMethod:@"POST"];

NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[photoRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"%@.jpg\"\r\n", obsID] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Disposition: form-data; name=\"text\"\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"photoID=1234" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[photoRequest setHTTPBody:body];

---

您的代码非常完美，只需在代码下方添加以下代码即可发送文本等其他数据

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
    [dict setObject:@"<YOUR TEXT>" forKey:@"<KEY>"];

    [body appendData:[self createFormData:dict withBoundary:boundary]];
    [photoRequest setHTTPBody:body];

    NSData *returnData = [NSURLConnection sendSynchronousRequest:photoRequest returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    NSLog(@"%@", returnString);

NSMutableDictionary*dict=[[NSMutableDictionary alloc]init]；
[dict setObject:@“forKey:@]”；
[body appendData:[self-createFormData:dict withBoundary:boundary]；
[photoRequest setHTTPBody:body]；
NSData*returnData=[NSURLConnection sendSynchronousRequest:photoRequest returningResponse:nil错误：nil]；
NSString*returnString=[[NSString alloc]initWithData:returnData编码：NSUTF8StringEncoding]；
NSLog（@“%@”，返回字符串）；

下面是创建表单数据的函数

- (NSData*)createFormData:(NSDictionary*)myDictionary withBoundary:(NSString*)myBounds
{
    NSMutableData *myReturn = [[NSMutableData alloc] init];
    NSArray *formKeys = [myDictionary allKeys];
    for (int i = 0; i < [formKeys count]; i++) {
        [myReturn appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",myBounds] dataUsingEncoding:NSASCIIStringEncoding]];
        [myReturn appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n%@",[formKeys objectAtIndex:i],[myDictionary valueForKey:[formKeys objectAtIndex:i]]] dataUsingEncoding:NSASCIIStringEncoding]];
    }
    return myReturn;
}

-（NSData*）createFormData:（NSDictionary*）myDictionary withBoundary:（NSString*）myBounds
{
NSMutableData*myReturn=[[NSMutableData alloc]init]；
NSArray*formKeys=[myDictionary allKeys]；
对于（int i=0；i<[formKeys count]；i++）{
[myReturn appendData:[[NSString stringWithFormat:@“\r\n--%@\r\n”，myBounds]dataUsingEncoding:NSASCIIStringEncoding]；
[myReturn appendData:[[NSString stringWithFormat:@“内容处置：表单数据；名称=\”%@“\r\n\r\n%@”，[formKeys objectAtIndex:i]，[myDictionary valueForKey:[formKeys objectAtIndex:i]]dataUsingEncoding:NSASCIIStringEncoding]；
}
返回我的返回；
}

这不起作用，但另一个答案起作用。我不确定原因，因为它们似乎暗示着相同的情况。@RichardGriffiths更新。这起到了作用。。。但我不知道为什么这个答案是正确的，而另一个答案不是。作为补充（因为它已经困惑了好几个小时），当您执行returnData returnString部分时，当我在php中使用print$query并始终将“null”返回给Xcode时，它似乎不喜欢它。打印“图像加载”之类的字符串没有问题。我想知道这个问题是什么，但我永远也看不到。这正常吗？问题在于文本？？。如果是的话，你能告诉我你通过了哪些文本吗？如果您输入空间字符或表情符号，则可能需要对该文本进行编码。