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iphone - 如何在 ios 中将 sendSynchronousRequest 更改为 sendASynchronousRequest?

转载 作者:行者123 更新时间:2023-11-28 20:31:47 25 4
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我正在服务器上上传图片。如何将同步请求更改为异步请求。因为我想在上传图片时使用进度条..

我的代码是。

+(NSDictionary *)UploadPhoto :(UIImage *)image{

NSString *DeviceId;
NSString *TokenValue=tokenTemp;

DeviceId = DevID;

NSString *Nonce=[self generateRandomString];
NSString *currentTimeStamp = [self GetTimeStamp];


NSString *Cipher=[NSString stringWithFormat:@"%@%@%@%@%@",mySecret,DeviceId,Nonce,currentTimeStamp,TokenValue];
Cipher=[Cipher URLDecodedString];
Cipher=[self GetCipher:Cipher];
UIImage *TempPicture=image;//[UIImage imageNamed:imageName];

NSData *PictureData=UIImageJPEGRepresentation(TempPicture, 1.0);
NSURL *url=[NSURL URLWithString:[NSString stringWithFormat:@"%@Messages.php",WebServiceUrl]];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setTimeoutInterval:20.0f];
[request setURL:url];
[request setHTTPMethod:@"POST"];
[request setValue:@"multipart/form-data; boundary=*****" forHTTPHeaderField:@"Content-Type"];

NSMutableData *postBody = [NSMutableData data];
NSString *stringBoundary = [NSString stringWithString:@"*****"];

[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"method\"\r\n\r\n"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"%@",@"Upload"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"Type\"\r\n\r\n"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"%@",@"0"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"Name\"\r\n\r\n"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"%@",@"XYZ ****************"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"MessageImage\"; filename=\"c.png\"\r\n\r\n"] dataUsingEncoding:NSASCIIStringEncoding]];
[postBody appendData:[NSData dataWithData:PictureData]];
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSASCIIStringEncoding]];
[request setHTTPBody: postBody];

[request setValue:Cipher forHTTPHeaderField:@"Cipher"];
[request setValue:DeviceId forHTTPHeaderField:@"Deviceid"];
[request setValue:Nonce forHTTPHeaderField:@"Nonce"];
[request setValue:currentTimeStamp forHTTPHeaderField:@"Timestamp"];
[request setValue:TokenValue forHTTPHeaderField:@"Token"];

[request setHTTPBody:postBody];
NSError *error;
NSHTTPURLResponse *response;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

NSString *data=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];

if (!data) {
NSLog(@"nil");
}
NSDictionary *temp= [response allHeaderFields];

NSString *temp2= [temp objectForKey:@"Responsecode"];
if(temp2!=nil && [temp2 length]>0)
{

}
else
{

}
return temp;
}

谢谢..请帮助..

如何调用- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite 在此代码中..

最佳答案

如果你想跟踪上传进度,你必须使用

NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]

并实现所有的 NSURLConnectionDelegate 方法。这是描述in this Apple documentation .

特别是 connection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite: 委托(delegate)方法会通知您上传进度。

此方法的另一个优点是您可以取消一个请求,这是sendSynchronousRequestsendASynchronousRequest 做不到的。

关于iphone - 如何在 ios 中将 sendSynchronousRequest 更改为 sendASynchronousRequest?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11912860/

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