[Xcode] Fixed: Build error that it import Objective-C codes in the .cpp?

Build error: (NSObjCRuntime.h & NSObject)

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:371:1: Expected unqualified-id

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:373:19: Unknown type name 'NSString'
...

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/objc/NSObject.h:11:1: Expected unqualified-id
...


[Solution]
rename extension name from .cpp into .mm

[Xcode] Fixed: _CMAudioFormatDescriptionGetStreamBasicDescription", referenced from: -[captureNSObject init] in captureNSObject.o

I have a project to build some code,  and then it has error in the follow:

Undefined symbols for architecture x86_64:

  "_CMAudioFormatDescriptionGetStreamBasicDescription", referenced from:

      -[captureNSObject init] in captureNSObject.o

  "_CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer", referenced from:

      -[captureNSObject captureOutput:didOutputSampleBuffer:fromConnection:] in captureNSObject.o

  "_CMSampleBufferGetNumSamples", referenced from:

      -[captureNSObject captureOutput:didOutputSampleBuffer:fromConnection:] in captureNSObject.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

[Solution]

Add CoreMedia.framework into "Linked Frameworks and Libraries".

[Xcode] Enable/disable a button

@property (retain, nonatomic) IBOutlet UIButton *btnButton;

enable/disable like this in .m file:

btnButton.enabled = NO; // disable button
btnButton.enabled = YES; // enable button

[Xcode] How to convert int to NSString

    int nNum = 100;

    NSString* str = [[NSString alloc]initWithFormat:@"%d", nNum];

[Xcode] How to quit the application when the window closes

If you want an application to quit (terminate) when the window is closed, you can do this:

-(BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication*)theApplication
{
    return YES;
}

[Xcode] How to convert between NSTextField and NSString

// NSString --> NSTextField

NSTextField * txtField = [[NSTextField alloc] init];

NSString *str = @“1234”;

txtField.stringValue = str;

// NSTextField --> NSString

NSString *str1 = txtField.stringValue;

[Xcode] How to convert byte array to NSString

Byte* btData = new Byte[12];

memset(btData, 0, sizeof(Byte) * 12);

...

NSData *data = [NSData dataWithBytes:btData length:sizeof(btData)];

NSString *string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];

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