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第一個錯誤如何以編程方式在iOS中使用API MailJet發送附件的電子郵件？
我用這個代碼，但我不知道如何在iOS中使用API Mailjet？在哪裏把API密鑰私人，公共等... 我檢查了郵件， mailjet，doc mailJet關於API沒有成功。
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSLog(@"File Size: %lu",(unsigned long)[data length]);
//set up request
NSMutableURLRequest *request= [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:@"https://api.mailjet.com/v3/send"]];
[request setHTTPMethod:@"POST"];
//required xtra info
NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
//body of the post
NSMutableData *postbody = [NSMutableData data];
[postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"thefile\"; filename=\"recording\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[@"Content-Type: application/octet-stream\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:data];
[postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postbody];
NSURLConnection *apiConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
我做發送「手動」的測試，我有那個不好的答案。我必須把API KEY和SECRET KEY放在哪裏？ 
編輯
第二個錯誤
新代碼：
NSString *apiKey = @"*******************";
NSString *secretKey = @"**************";
NSString *mail = @"******@******.***";
// Dictionary that holds post parameters. You can set your post parameters that your server accepts or programmed to accept.
NSMutableDictionary* _params = [[NSMutableDictionary alloc] init];
[_params setObject:@"1.0" forKey:@"ver"];
[_params setObject:@"en" forKey:@"lan"];
[_params setObject:apiKey forKey:@"apiKey"];
[_params setObject:secretKey forKey:@"secretKey"];
// the boundary string : a random string, that will not repeat in post data, to separate post data fields.
NSString *BoundaryConstant = @"----------***********";
// string constant for the post parameter 'file'. My server uses this name: `file`. Your's may differ
NSString* FileParamConstant = @"file";
// the server url to which the image (or the media) is uploaded. Use your server url here
NSURL* requestURL = [NSURL URLWithString:@"https://api.mailjet.com/v3/send/"];
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];
//HTTP Basic Authentication
NSString *authenticationString = [NSString stringWithFormat:@"%@:%@", apiKey, secretKey];
NSData *authenticationData = [authenticationString dataUsingEncoding:NSASCIIStringEncoding];
NSString *authenticationValue = [authenticationData base64Encoding];
[request setValue:[NSString stringWithFormat:@"Basic %@", authenticationValue] forHTTPHeaderField:@"Authorization"];
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"@"application/json"; boundary=%@", BoundaryConstant];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
[request addValue:apiKey forHTTPHeaderField:@"apiKey"] ;
[request addValue:secretKey forHTTPHeaderField:@"secretKey"] ;
// post bodyv
NSMutableData *body = [NSMutableData data];
// add params (all params are strings)
for (NSString *param in _params) {
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
}
// add image data
UIImage *image = [UIImage imageWithContentsOfFile:filePath];
NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
if (imageData) {
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; FromEmail:\"[email protected]****.fr\"; \"Text-part\":\"Dear\" ; Recipients:[{\"Email\":\"****@gmail.com\"}]; name=\"%@\"; filename=\"image.jpg\"\r\n", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
// set URL
[request setURL:requestURL];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(@"requestReply: %@, error: %@", requestReply, error);
}] resume];
新的錯誤消息： 
任何想法？
謝謝，它完美的作品！ – Claudio