使用 Objective-C 发送 HTTP POST 数据

Question

我有一些使用 POST 发送图像的代码。我想要做的是在同一个 post 中发送一些文本。这是我目前所拥有的：

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];

这是因为图像是由 URL 发送和接收的。我想要做的是发送一些其他信息——例如 photoID——作为一个字符串并在同一个请求中。这可能吗？

Answer 1

是的，这是可能的。试一试。

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];

Answer 2

您的代码非常完美，只需在您的代码下方添加以下代码即可发送其他数据，例如文本。

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);

这里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;
}

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