以post方式发送UIImage到服务器

//This example send email with attachment using server side
//So iPhone will fill form and send proper request to web server using POST method
//For test you can use attached sendEmail.php

-(NSMutableData *)generateDataFromText:(NSString *)dataText fieldName:(NSString *)fieldName{
NSString *post = [NSString stringWithFormat:@"--AaB03x\r\nContent-Disposition: form-data; name=\"%@\"\r\n\r\n", fieldName];

// Get the post header int ASCII format:
NSData *postHeaderData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

// Generate the mutable data variable:
NSMutableData *postData = [[NSMutableData alloc] initWithLength:[postHeaderData length] ];

[postData setData:postHeaderData];

NSData *uploadData = [dataText dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

// Add the text:
[postData appendData: uploadData];

// Add the closing boundry:
[postData appendData: [@"\r\n" dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]];

// Return the post data:
return postData;
}

- (NSData *)generatePostDataForData:(NSData *)uploadData fileName:(NSString *)fileName{

// Generate the post header:
NSString *post = [NSString stringWithFormat:@"--AaB03x\r\nContent-Disposition: form-data; name=\"attachment\"; filename=\"%@\"\r\nContent-Type: video/3gpp\r\n\r\n", fileName];

// Get the post header int ASCII format:
NSData *postHeaderData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

// Generate the mutable data variable:
NSMutableData *postData = [[NSMutableData alloc] initWithLength:[postHeaderData length] ];

[postData setData:postHeaderData];

// Add the image:
[postData appendData: uploadData];

// Add the closing boundry:
[postData appendData: [@"\r\n--AaB03x--" dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]];

// Return the post data:
return postData;
}

-(void)sendEmailTo:(NSString *)email name:(NSString *)name {

NSString *emailBody = @"Just some HTML text"

//Fill some text fields
NSMutableData *postData = [self generateDataFromText:email fieldName:@"to_email"];

[postData appendData:[self generateDataFromText:@"10000000" fieldName:@"MAX_FILE_SIZE"]];

[postData appendData:[self generateDataFromText:name fieldName:@"to_name"]];
[postData appendData:[self generateDataFromText:email fieldName:@"to_email"]];
[postData appendData:[self generateDataFromText:[[NSUserDefaults standardUserDefaults] stringForKey:@"name_preference"] fieldName:@"from_name"]];
[postData appendData:[self generateDataFromText:[[NSUserDefaults standardUserDefaults] stringForKey:@"email_preference"] fieldName:@"from_email"]];
[postData appendData:[self generateDataFromText:currentEmail.emailSubject fieldName:@"subject"]];
[postData appendData:[self generateDataFromText:emailBody fieldName:@"body"]];
[postData appendData:[self generateDataFromText:email fieldName:@"to_email"]];

//Prepare data for file
NSData *dataObj = [NSData dataWithContentsOfFile:@"/link/to/file"];

[postData appendData:[self generatePostDataForData:dataObj fileName:@"fileName"]];

// Setup the request:
NSMutableURLRequest *uploadRequest = [[[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:kLinkToPostFile] cachePolicy: NSURLRequestReloadIgnoringLocalCacheData timeoutInterval: 30 ] autorelease];

[uploadRequest setHTTPMethod:@"POST"];
[uploadRequest setValue:[NSString stringWithFormat:@"%d", [postData length]] forHTTPHeaderField:@"Content-Length"];
[uploadRequest setValue:@"multipart/form-data; boundary=AaB03x" forHTTPHeaderField:@"Content-Type"];
[uploadRequest setHTTPBody: postData];

NSData *responseData = [NSURLConnection sendSynchronousRequest:uploadRequest returningResponse:nil error:nil];

NSLog([[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding]);
}