使用两个 url 执行操作以一次发送两个图像

Question

我需要使用两个 url 发送两张图片。这里的障碍是我需要从第一个 url 获得响应，我需要将它与第二个 url 一起使用。

NSString *requestString =[NSString stringWithFormat:@"UserId=%@&CategoryId=%@&Continent=%@&Country=%@&City=%@&Gender=%@&ImageName=%@&AgeRange=%@",PassedUserId,CategoryId,continentTextfield.text,countrytextfield.text,citytextfield.text,GenderText.text,imagename,ageTextfield.text];
NSLog(@"%@",requestString);

NSString *url=[NSString stringWithFormat:@"http://192.168.2.4:98/InsertObjectImage?%@",requestString];


NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

[request setURL:[NSURL URLWithString:url]];

[request setHTTPMethod:@"POST"];

// Create 'POST' MutableRequest with Data and Other Image Attachment.


NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField:@"Content-Type"];
NSData *data = UIImageJPEGRepresentation(chosenImage, 0.2f);
[request addValue:@"image/JPEG" forHTTPHeaderField:@"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[NSData dataWithData:data]];
[request setHTTPBody:body];

NSData *returnData;
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"Ret: %@",returnString);
NSLog(@"imageid%@",compareId);

这里我需要获取 imageId 并且我必须与第二个 url 一起使用。

  NSString *requestString1 =[NSString stringWithFormat:@"UserId=%@&ImageName=%@&ImageId=%@",PassedUserId,imagename,compareId];
    NSLog(@"secondImage%@",requestString1);

    NSString *url=[NSString stringWithFormat:@"http://192.168.2.4:98/UserImage.svc/UpdateObjectImage??%@",requestString1];


    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

    [request setURL:[NSURL URLWithString:url]];

    [request setHTTPMethod:@"POST"];

    // Create 'POST' MutableRequest with Data and Other Image Attachment.


    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField:@"Content-Type"];
    NSData *data = UIImageJPEGRepresentation(chosenImage, 0.2f);
    [request addValue:@"image/JPEG" forHTTPHeaderField:@"Content-Type"];

    NSMutableData *body = [NSMutableData data];
    [body appendData:[NSData dataWithData:data]];
    [request setHTTPBody:body];

    NSData *returnData;
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"Ret: %@",returnString);

Answer 1

使用块编码

typedef void (^onSuccess)(BOOL success);

// 使用属性

@property (nonatomic,retain) onSuccess block;

//拨打电话

[self uploadFileWithURL:@"First URL" withCompletionBlock:^(BOOL success) {
    if (success) {
        [self uploadFileWithURL:@"Second" withCompletionBlock:nil]
    }
}];

// 连接

-(void) uploadFileWithURL:(NSURL *)url withCompletionBlock:(onSuccess)completeBlock {

self.block = [completeBlock copy];
NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:url] delegate:self];
[connection start];

}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;{
    self.block(TRUE);
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;{
    self.block(FALSE);

}

Answer 2

为什么不创建一个单独的类来上传图像。类似的东西

ImageUploader.h/m

在类中实现所有功能，并调用该函数以在不同线程中上传图像。见下文

ImageUploader.h

#import <Foundation/Foundation.h>

@interface ImageUploader : NSObject
-(void)uploadImage:(NSData *)imageData withRequestURL:(NSString *)url;
@end

ImageUploader.m

#import "ImageUploader.h"

@implementation ImageUploader
-(void)uploadImage:(NSData *)imageData withRequestURL:(NSString *)url{

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

    [request setURL:[NSURL URLWithString:url]];

    [request setHTTPMethod:@"POST"];

    // Create 'POST' MutableRequest with Data and Other Image Attachment.


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

    [request addValue:@"image/JPEG" forHTTPHeaderField:@"Content-Type"];

    NSMutableData *body = [NSMutableData data];
    [body appendData:imageData];
    [request setHTTPBody:body];

    NSData *returnData;
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"Ret: %@",returnString);
    NSLog(@"imageid%@",compareId);

}
@end

然后调用函数

第一次请求

NSString *requestString =[NSString stringWithFormat:@"UserId=%@&CategoryId=%@&Continent=%@&Country=%@&City=%@&Gender=%@&ImageName=%@&AgeRange=%@",PassedUserId,CategoryId,continentTextfield.text,countrytextfield.text,citytextfield.text,GenderText.text,imagename,ageTextfield.text];

NSString *url=[NSString stringWithFormat:@"http://192.168.2.4:98/InsertObjectImage?%@",requestString];
ImageUploader *uploader1=[[ImageUploader alloc] init];
[uploader1 uploadImage:UIImageJPEGRepresentation(chosenImage, 0.2f) withRequestURL:url];

第二次请求

requestString=[NSString stringWithFormat:@"UserId=%@&ImageName=%@&ImageId=%@",PassedUserId,imagename,compareId];
url=[NSString stringWithFormat:@"http://192.168.2.4:98/UserImage.svc/UpdateObjectImage??%@",requestString];

ImageUploader *uploader2=[[ImageUploader alloc] init];
[uploader2 uploadImage:UIImageJPEGRepresentation(chosenImage, 0.2f) withRequestURL:url];

上述两个函数将一起调用。顺便说一句，你应该这样做Asynchronously，而不是Synchronously。

干杯。