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]);	
}