我正在尝试实施下载信封文档的DocuSign服务的示例link，但是当执行在步骤3中到达此行时：
NSMutableString *jsonResponse = [[NSMutableString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
jsonResponse是nil，当我打开文档时，它有很多奇怪的字符，我无法读取它。
我的downloadind代码如下：
NSString *url = @"https://demo.docusign.net/restapi/v2/accounts/373577/envelopes/08016140-e4dc-4697-8146-f8ce801abf92/documents/1";
NSMutableURLRequest *documentsRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]];
[documentsRequest setHTTPMethod:@"GET"];
[documentsRequest setURL:[NSURL URLWithString:url]];
[documentsRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[documentsRequest setValue:[self jsonStringFromObject:authenticationHeader] forHTTPHeaderField:@"X-DocuSign-Authentication"];
NSError *error1 = [[NSError alloc] init];
NSHTTPURLResponse *responseCode = nil;
NSData *oResponseData = [NSURLConnection sendSynchronousRequest:documentsRequest returningResponse:&responseCode error:&error1];
NSMutableString *jsonResponse = [[NSMutableString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
if([responseCode statusCode] != 200){
NSLog(@"Error sending %@ request to %@\nHTTP status code = %i", [documentsRequest HTTPMethod], url, [responseCode statusCode]);
NSLog( @"Response = %@", jsonResponse );
return;
}
// download the document to the same directory as this app
NSString *appDirectory = [[[NSBundle mainBundle] bundlePath] stringByDeletingLastPathComponent];
NSMutableString *filePath = [NSMutableString stringWithFormat:@"%@/%@", appDirectory, @"eee"];
[oResponseData writeToFile:filePath atomically:YES];
NSLog(@"Envelope document - %@ - has been downloaded to %@\n", @"eee", filePath);
答案 0 :(得分：0)
如果没有来自
的数据NSMutableString *jsonResponse = [[NSMutableString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
那么这意味着oResponseData很可能是nil，这意味着没有为每个信封文档正确构建URL。您是否在sample that you linked to中执行第2步，它首先检索有关信封的envelopeDocuments信息，然后动态构建每个唯一文档uri以准备下载每个文件。
您应该动态检索envelopeDocuments数据，然后动态构建每个文档，然后您的响应数据不会为零，而不是对您的网址进行硬编码。这是完整的工作样本：
- (void)getDocumentInfoAndDownloadDocuments
{
// Enter your info:
NSString *email = @"<#email#>";
NSString *password = @"<#password#>";
NSString *integratorKey = @"<#integratorKey#>";
// need to copy a valid envelopeId from your account
NSString *envelopeId = @"<#envelopeId#>";
///////////////////////////////////////////////////////////////////////////////////////
// STEP 1 - Login (retrieves accountId and baseUrl)
///////////////////////////////////////////////////////////////////////////////////////
NSString *loginURL = @"https://demo.docusign.net/restapi/v2/login_information";
NSMutableURLRequest *loginRequest = [[NSMutableURLRequest alloc] init];
[loginRequest setHTTPMethod:@"GET"];
[loginRequest setURL:[NSURL URLWithString:loginURL]];
// set JSON formatted X-DocuSign-Authentication header (XML also accepted)
NSDictionary *authenticationHeader = @{@"Username": email, @"Password" : password, @"IntegratorKey" : integratorKey};
// jsonStringFromObject() function defined further below...
[loginRequest setValue:[self jsonStringFromObject:authenticationHeader] forHTTPHeaderField:@"X-DocuSign-Authentication"];
// also set the Content-Type header (other accepted type is application/xml)
[loginRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[NSURLConnection sendAsynchronousRequest:loginRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *loginResponse, NSData *loginData, NSError *loginError) {
if (loginError) { // succesful GET returns status 200
NSLog(@"Error sending request %@. Got Response %@ Error is: %@", loginRequest, loginResponse, loginError);
return;
}
// we use NSJSONSerialization to parse the JSON formatted response
NSError *jsonError = nil;
NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:loginData options:kNilOptions error:&jsonError];
NSArray *loginArray = responseDictionary[@"loginAccounts"];
// parse the accountId and baseUrl from the response (other data included)
NSString *accountId = loginArray[0][@"accountId"];
NSString *baseUrl = loginArray[0][@"baseUrl"];
//--- display results
NSLog(@"\naccountId = %@\nbaseUrl = %@\n", accountId, baseUrl);
///////////////////////////////////////////////////////////////////////////////////////
// STEP 2 - Get Document Info for specified envelope
///////////////////////////////////////////////////////////////////////////////////////
// append /envelopes/{envelopeId}/documents URI to baseUrl and use as endpoint for next request
NSString *documentsURL = [NSMutableString stringWithFormat:@"%@/envelopes/%@/documents", baseUrl, envelopeId];
NSMutableURLRequest *documentsRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:documentsURL]];
[documentsRequest setHTTPMethod:@"GET"];
[documentsRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[documentsRequest setValue:[self jsonStringFromObject:authenticationHeader] forHTTPHeaderField:@"X-DocuSign-Authentication"];
[NSURLConnection sendAsynchronousRequest:documentsRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *documentsResponse, NSData *documentsData, NSError *documentsError) {
NSError *documentsJSONError = nil;
NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:documentsData options:kNilOptions error:&documentsJSONError];
if (documentsError){
NSLog(@"Error sending request: %@. Got response: %@", documentsRequest, documentsResponse);
NSLog( @"Response = %@", documentsResponse );
return;
}
NSLog( @"Documents info for envelope is:\n%@", jsonResponse);
NSError *jsonError = nil;
NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:documentsData options:kNilOptions error:&jsonError];
// grab documents info for the next step...
NSArray *documentsArray = responseDictionary[@"envelopeDocuments"];
///////////////////////////////////////////////////////////////////////////////////////
// STEP 3 - Download each envelope document
///////////////////////////////////////////////////////////////////////////////////////
NSMutableString *docUri;
NSMutableString *docName;
NSMutableString *docURL;
// loop through each document uri and download each doc (including the envelope's certificate)
for (int i = 0; i < [documentsArray count]; i++)
{
docUri = [documentsArray[i] objectForKey:@"uri"];
docName = [documentsArray[i] objectForKey:@"name"];
docURL = [NSMutableString stringWithFormat: @"%@/%@", baseUrl, docUri];
[documentsRequest setHTTPMethod:@"GET"];
[documentsRequest setURL:[NSURL URLWithString:docURL]];
[documentsRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[documentsRequest setValue:[self jsonStringFromObject:authenticationHeader] forHTTPHeaderField:@"X-DocuSign-Authentication"];
NSError *error = [[NSError alloc] init];
NSHTTPURLResponse *responseCode = nil;
NSData *oResponseData = [NSURLConnection sendSynchronousRequest:documentsRequest returningResponse:&responseCode error:&error];
NSMutableString *jsonResponse = [[NSMutableString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
if([responseCode statusCode] != 200){
NSLog(@"Error sending %@ request to %@\nHTTP status code = %i", [documentsRequest HTTPMethod], docURL, [responseCode statusCode]);
NSLog( @"Response = %@", jsonResponse );
return;
}
// download the document to the same directory as this app
NSString *appDirectory = [[[NSBundle mainBundle] bundlePath] stringByDeletingLastPathComponent];
NSMutableString *filePath = [NSMutableString stringWithFormat:@"%@/%@", appDirectory, docName];
[oResponseData writeToFile:filePath atomically:YES];
NSLog(@"Envelope document - %@ - has been downloaded to %@\n", docName, filePath);
} // end for
}];
}];
}
- (NSString *)jsonStringFromObject:(id)object {
NSString *string = [[NSString alloc] initWithData:[NSJSONSerialization dataWithJSONObject:object options:0 error:nil] encoding:NSUTF8StringEncoding];
return string;
}