Accessing data from C++ function into UITextView controller - c++

Question

I have a question guys.
I need to assign value to UITextView controller in my iPad app from a C++ function. So, the C++ function return a string and I can see that output in the output window. I merged C++ and XCode objective C by using .mm file. Now, I need to get the value from C++ function and add them in the UITextFiled.
Say for example.
My C++ function is like the following:
.cpp file
void *consumer (void* data)
{
SyncBuffThang<GLOBAL_BUFF_LEN,GLOBAL_BUFFS>* cc =(SyncBuffThang<GLOBAL_BUFF_LEN,GLOBAL_BUFFS>*) data;
affinity("consumer", cons);
for (int ii=0; ii<100; ii++)
{
unsigned char c = cc->get();
cc->res = c;
myVar = c;
cerr << "Consumer Get" << myVar << endl;
f +=c;
}
cerr << "Leaving consumer in method cons" << f << endl;
return 0;
}
int PC9::RunPC()
{
SyncBuffThang<GLOBAL_BUFF_LEN, GLOBAL_BUFFS> pc;
pthread_t p, c;
pthread_create(&p, 0, producer, &pc);
pthread_create(&c, 0, consumer, &pc);
pthread_join(p, 0);
pthread_join(c,0);
}
And the following sows the .mm file code.
#import "PC.h"
#import "PC9.h"
#import "GV.h"
#implementation PC
-(void)callFunctionPC
{
PC9 * myCPlusPlusObj; //A C++ object
myCPlusPlusObj=new PC9();
myCPlusPlusObj-> RunPC();
}
#end
See in the above function I can print the myVar but, I don't know how to access it or view it on UITextFile from my iPad app.
Friends I would really appreciate your help.
Thanks in advance.
-T

Answer 1

Here is the Answer I've been waiting for!!!
HelloWorld.h
#ifndef __Demo1__HelloWorld__
#define __Demo1__HelloWorld__
#include <iostream>
#endif
class HelloWorld {
public:
std::string Mtd_HelloWorld();
};
HelloWorld.cpp
#include "HelloWorld.h"
std::string HelloWorld::Mtd_HelloWorld()
{
std::string output;
output = "This is from C++";
return output;
}
HelloWorldM.h
#import <Foundation/Foundation.h>
#interface HelloWorld_M : NSObject
-(NSString *)CallCPP;
-(UIView *)CreateTextView:(NSString *)input;
#end
HelloWorld.mm
#import "PCViewController.h"
#include "HelloWorld.h"
#include "HelloWorld_M.h"
#implementation HelloWorld_M
-(NSString *)CallCPP
{
HelloWorld * myCPlusPlusObj; //A C++ object
myCPlusPlusObj=new HelloWorld();
std::string res = myCPlusPlusObj-> Mtd_HelloWorld();
NSString *result = [NSString stringWithCString:res.c_str()
encoding:[NSString defaultCStringEncoding]];
return result;
}
-(UIView *)CreateTextView:(NSString *)input
{
UITextView *myTextView = [[UITextView alloc] initWithFrame: CGRectMake (0.0,0.0,320.0,200.0)];
myTextView.text = input;
return myTextView;
}
#end
PCViewController.h
#import <UIKit/UIKit.h>
#import "HelloWorld_M.h"
#interface PCViewController : UIViewController
{
HelloWorld_M *objHelloWorld;
}
- (IBAction)RunHelloWorld:(id)sender;
#end
PCViewController.m
#import "PCViewController.h"
#interface PCViewController ()
#end
#implementation PCViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)RunHelloWorld:(id)sender
{
objHelloWorld = [[HelloWorld_M alloc]init];
[self.view addSubview: [objHelloWorld CreateTextView:[objHelloWorld CallCPP]]] ;
}
#end