Question

我需要一些编译错误的帮助。整个计划如下：

int main(int argc, char* argv[])
{
    NSLog("entered main\n");
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"http://YourURL.com/FakeURL/PARAMETERS"]];
    [request setHTTPMethod:@"GET"];

    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: %@", requestReply);
    }] resume];
    NSLog("leaving main\n");
    return 0;
}

这是我在Objective-C中编程的第二天。所有我都想尝试从Objective-C做出GET请求。这是在OSX上使用gcc。我安装了xcode，但这是一个简单的程序。编译器抱怨：

  Undefined symbols for architecture x86_64:
  "_NSLog", referenced from:
      ___23-[Easyhttp sendHTTPGet]_block_invoke in Easyhttp-c1cd8d.o
  "_OBJC_CLASS_$_NSOperationQueue", referenced from:
      objc-class-ref in Easyhttp-c1cd8d.o
  "_OBJC_CLASS_$_NSString", referenced from:
      objc-class-ref in Easyhttp-c1cd8d.o
  "_OBJC_CLASS_$_NSURL", referenced from:
      objc-class-ref in Easyhttp-c1cd8d.o
  "_OBJC_CLASS_$_NSURLSession", referenced from:
      objc-class-ref in Easyhttp-c1cd8d.o
  "_OBJC_CLASS_$_NSURLSessionConfiguration", referenced from:
      objc-class-ref in Easyhttp-c1cd8d.o
  "___CFConstantStringClassReference", referenced from:
      CFString in Easyhttp-c1cd8d.o
      CFString in Easyhttp-c1cd8d.o
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

您正在使用的那些类是Foundation框架（NSString，NSLog等）的一部分。您需要将其导入到您的代码中。

非常简单的Objective-C HTTP GET请求代码无法编译

1 个答案: