Objective-C and Swift Discussion Boards

Re: Start java program from Objective C code

DraqueD5-Jan-15 9:52

5-Jan-15 9:52

Part of the trouble I'm having here is that I'm ultimately trying to reproduce the Terminal line:

java -jar PolyGlot.jar <FILENAME_ARGUMENT >

Do you have any ideas for that? Any help would be appreciated.

Re: Start java program from Objective C code

Richard MacCutchan5-Jan-15 22:39

Richard MacCutchan

5-Jan-15 22:39

Objective-C

task.launchPath = [currentpath stringByAppendingString:@"/java"];

Are you sure that the java executable is in that path? Printing out the full path at that point will tell you.

Re: Start java program from Objective C code

DraqueD6-Jan-15 5:04

DraqueD

6-Jan-15 5:04

Ah, I do see what I was doing there! I was fundamentally misunderstanding how java was being referenced. I almost have it working at this point! Here's the code as it stands now:

int main(int argc, const char * argv[]) {
    NSFileManager *filemgr;
    NSString *currentpath;

    filemgr = [[NSFileManager alloc] init];

    currentpath = [filemgr currentDirectoryPath];

    NSPipe *pipe = [NSPipe pipe];
    NSFileHandle *file = pipe.fileHandleForReading;

    NSTask *task = [[NSTask alloc] init];
    task.launchPath = @"/usr/bin/java";
    task.arguments = @[@"-jar", [currentpath stringByAppendingString:@"/PolyGlot.jar"], [NSString stringWithFormat:@"%c", argv]];
    task.standardOutput = pipe;

    [task launch];

    NSData *data = [file readDataToEndOfFile];
    [file closeFile];

    NSString *grepOutput = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
    NSLog (@"grep returned:\n%@", grepOutput);

    return 0;
}

The only remaining problem is that the "-jar" argument seems to be ignored at this point. If I apply it by itself, Java recognizes it as an argument, but otherwise, it is only accepting "PolyGlot.jar". Is there something that I'm not doing correctly there?

Thanks for the help so far!

Re: Start java program from Objective C code

Richard MacCutchan6-Jan-15 5:29

Richard MacCutchan

6-Jan-15 5:29

I don't know Objective-C, but I suspect that the first argument should be the same as task.launchPath, i.e the program name. That would then comply with the format of the argv array, as set by the shell when invoking programs from the command line.

Re: Start java program from Objective C code

DraqueD6-Jan-15 5:43

DraqueD

6-Jan-15 5:43

The task.launchPath is the full path of the program to be run. Out of curiosity, I tried dropping " -jar" onto the end, but that made it fail when it looked for the executable "java -jar" rather than the executable "java" with the argument "-jar".

What's strange is that the "-jar" argument works correctly so long as it's the only one... Ultimately, the error I'm getting from Java at this point is "

Could not find or load main class

". This typically appears if you try to run a .jar file without the -jar argument.

Also, just for the sake of sanity, I'll specify that I can run "java -jar PolyGlot <FILENAME>" from the console, and it runs fine.

Re: Start java program from Objective C code

Richard MacCutchan6-Jan-15 6:29

Richard MacCutchan

6-Jan-15 6:29

DraqueD wrote:
I can run "java -jar PolyGlot <FILENAME>" from the console, and it runs fine.

And I think those are the fields that you need in your arguments array. The last parameter you specify should be argv[1] as a string (%s), not a character (%c), as that is the filename passed in to your program. Something like:

Objective-C

task.launchPath = @"/usr/bin/java";
task.arguments = @[task.launchPath, @"-jar", [currentpath stringByAppendingString:@"/PolyGlot.jar"], [NSString stringWithFormat:@"%s", argv[1]]];

Re: Start java program from Objective C code

DraqueD6-Jan-15 9:29

DraqueD

6-Jan-15 9:29

As a heads up, I found my solution! It turns out that the debug folder that this was running in gave Java particular troubles, and the behavior cleared up when I took my compiled app into a typical folder. Thanks to everyone who replied for the help!

Re: Start java program from Objective C code

seemajoshii27-Feb-15 1:22

seemajoshii

27-Feb-15 1:22

I think there is an problem in executable path..Check out that

How do I find Objective C developers?

Waffleapp13-Dec-14 7:13

Waffleapp

13-Dec-14 7:13

We've just completed an iOS app called Waffle which is launching in the new year and are looking for Node.js developers to join our team.

Waffle is a a community for you to share your thoughts & learn from the world around you. Jump into group chats with people who share your interests and enjoy fast, flowing conversations on the things you’re passionate about.

We have a 3 strong team with backgrounds working for Microsoft. EASA and are looking for hard working and passionate developers either part or full time.

If you're interested please email sharan@waffleapp.co

Sharan

In objective-c I’m try to create a statement that toggles a variable

Member 1125124020-Nov-14 11:02

Member 11251240

20-Nov-14 11:02

In objective-c I’m try to create a statement that toggles a variable that switches between two numbers with a UIswitch controller
(a * b/w * r) c * h;
r needs to trigger two different numbers
when on needs to = .73
when off needs to = .66
int a=1;
int b=5.14;
int c = -.015;
int w =1;
int r =.73;// on=.73 and off= .66
int h=1;
int result;

result = (a * b/w * r) c * h;
NSLog (@"a*b/w*r)c*h;");
Is this possible

Re: In objective-c I’m try to create a statement that toggles a variable

Richard MacCutchan20-Nov-14 21:56

Richard MacCutchan

20-Nov-14 21:56

Member 11251240 wrote:
Is this possible

Most likely but your question is far from clear. In general terms you would write something like:

C++

// in switch change event handler
if (switch == ON)
    r = .73;
else
    r = .66;

But maybe I just don't understand what you are asking.

Difference between C and Objective-C

online visit9-Jun-14 19:32

online visit

9-Jun-14 19:32

What is the core difference between C programming language and Objective-C programming language? Please help me to know with suitable examples. A lot of Thanks in Advance.

Regards
Online Visit

online visit

Re: Difference between C and Objective-C

future20159-Jun-14 20:57

future2015

9-Jun-14 20:57

C and Objective-C have many differences.
First of all, C is procedure-oriented language while object-C is object-oriented language.
They have different syntaxes.
Objective-C is more familiar to smalltalk than C/C++.
e.g. of calling method
c: foo(param1, para2, ...);
objective-c: [object foo:param];
There are many differences between two languages.
Smile | :)

jian

Re: Difference between C and Objective-C

online visit9-Jun-14 21:31

online visit

9-Jun-14 21:31

thanks sir, but i need some real life example to clear this concept more.

Regards
Online Visit

Re: Difference between C and Objective-C

Richard MacCutchan9-Jun-14 21:00

Richard MacCutchan

9-Jun-14 21:00

Google will find you lots of documentation on both languages.

Re: Difference between C and Objective-C

thatraja10-Jun-14 21:11

thatraja

10-Jun-14 21:11

Possible spammer?

thatraja

Code converters | Education Needed | Improve Everything^New

Re: Difference between C and Objective-C

Richard MacCutchan10-Jun-14 21:28

Richard MacCutchan

10-Jun-14 21:28

I don't think so. It's quite reasonable to want to learn the differences, just a pity he/she (like so many others) can't make the effort to do a bit of research.

Re: Difference between C and Objective-C

thatraja10-Jun-14 21:42

thatraja

10-Jun-14 21:42

Nothing wrong with his question.
But I checked his user id, signature in his message & links in his profile so thought ....

thatraja

Code converters | Education Needed | Improve Everything^New

Re: Difference between C and Objective-C

Dennis E White11-Jun-14 4:24

Dennis E White

11-Jun-14 4:24

after looking at his signature I am thinking the same thing about this being spam now.

Re: Difference between C and Objective-C

Richard MacCutchan11-Jun-14 5:53

Richard MacCutchan

11-Jun-14 5:53

I disagree, the question has nothing in it that could be construed as spam. And there are quite a few members who have links to their own business in their signatures.

Re: Difference between C and Objective-C

Dennis E White11-Jun-14 4:22

Dennis E White

11-Jun-14 4:22

have to agree with what Richard said earlier....

but let me google that for you[^]

Re: Difference between C and Objective-C

Manikandan1011-Jun-14 17:31

Manikandan10

11-Jun-14 17:31

5+.

UIWebView Scroll delegate

Erdinc2720-May-14 22:17

Erdinc27

20-May-14 22:17

hey all. i have an UIWebView(tarayici in my situation) in view controller. it works fine when its scroll view delegate is not assigned to view controller. but i need to know when it is scrolled that is why i wrote this code.

Objective-C

self.tarayici.scrollView.delegate = self;

but when i write this down then webview acts so weird. for example after this code when i want to scroll then it scrolls only once if i make 3 or 4 attempts. so how can make it work more efficient with that code ?

vemedya.com

Re: UIWebView Scroll delegate

Dennis E White21-May-14 4:38

Dennis E White

21-May-14 4:38

Before you added your UIWebView did you set the user interaction??

Objective-C

webView.userInteraction = YES;

// down here is where you add it as a child

Re: UIWebView Scroll delegate

Erdinc2721-May-14 4:48

Erdinc27

21-May-14 4:48

i think i found the solution. The commented UIview animation block locked the main thread i think that is why Scroll View couldnt response to the new touches. but with this new animation block it works well.

Objective-C

- (void) scrollViewDidScroll:(UIScrollView *)scrollView
{
    
    if (self.lastContentOffset > scrollView.contentOffset.y)
    {
        if (self.altView.frame.size.height + self.altView.frame.origin.y > self.screenHeight)
        {
//            [UIView animateWithDuration:0.5f animations:^{
//                self.altView.frame = CGRectMake(0, self.altView.frame.origin.y-1, 320, 48);
//                self.tarayici.frame = CGRectMake(0, self.tarayici.frame.origin.y, 320, self.tarayici.frame.size.height-1);
//            }];
            
            [UIView animateWithDuration:0.5f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
                self.altView.frame = CGRectMake(0, self.altView.frame.origin.y-1, 320, 48);
                self.tarayici.frame = CGRectMake(0, self.tarayici.frame.origin.y, 320, self.tarayici.frame.size.height-1);
            } completion:^(BOOL finished) {
                
            }];
        }
        
    }
    else if (self.lastContentOffset < scrollView.contentOffset.y)
    {
        if (self.altView.frame.origin.y < self.screenHeight)
        {
//            [UIView animateWithDuration:0.5f animations:^{
//                self.altView.frame = CGRectMake(0, self.altView.frame.origin.y + 1, 320, 48);
//                self.tarayici.frame = CGRectMake(0, self.tarayici.frame.origin.y, 320, self.tarayici.frame.size.height+1);
//            }];
            [UIView animateWithDuration:0.5f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
                self.altView.frame = CGRectMake(0, self.altView.frame.origin.y + 1, 320, 48);
                self.tarayici.frame = CGRectMake(0, self.tarayici.frame.origin.y, 320, self.tarayici.frame.size.height+1);
            } completion:^(BOOL finished) {
                
            }];
        }
    }
    
    self.lastContentOffset = scrollView.contentOffset.y;

}

vemedya.com

modified 22-May-14 4:15am.

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