# Missing uObjC from global namespace (iOS foreign code)

**URL:** <https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470>\
**Category:** Bug Reports\
**Created:** [October 8, 2016, 4:59am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470 "2016-10-08T04:59:11Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sahal\_Zain](https://avatars.discourse-cdn.com/v4/letter/s/d2c977/32.png) [@Sahal\_Zain](https://forums.fusetools.com/u/Sahal_Zain)\
**Post date:** [October 8, 2016, 4:59am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/1 "2016-10-08T04:59:11Z")

</div>

Hi,

Just try to compile my project with foreign code and encounter this error when compiling in XCode

`Error: no member named 'uObjC' in the global namespace`

After I check the code, it seems that it’s coming from fuse generated source code. I have to add `#include "uObjC.String.h"` manually in generated source code through XCode. This issue was not the case in previous build (last time I try to compile this code is with build 0.21), and currently I’m using latest build (0.27)

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 17, 2016, 6:22pm UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/2 "2016-10-17T18:22:44Z")

</div>

Same issue here

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 18, 2016, 8:34am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/3 "2016-10-18T08:34:02Z")

</div>

Hello, and thanks for your report.

Can either of you share your code? I just made a minimal app with some foreign code but didn’t run into this. What _should_ happen (and it does for me) is that any generated code that uses foreign code should get the `uObjC.Foreign.h` include (which transitively includes `uObjC.String.h`), so perhaps you’re running into some problem with that mechanism.

Cheers!

---

<div class="post-metadata">

**Author:** ![Sahal\_Zain](https://avatars.discourse-cdn.com/v4/letter/s/d2c977/32.png) [@Sahal\_Zain](https://forums.fusetools.com/u/Sahal_Zain)\
**Post date:** [October 18, 2016, 11:25am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/4 "2016-10-18T11:25:15Z")

</div>

Hi,

I was building this project  
[https://github.com/zean00/fuse-qreader](https://github.com/zean00/fuse-qreader) and got that error.

And I think it’s caused by code generated by this function

Objective C code

```auto
- (void)reader:(QRCodeReaderViewController *)reader didScanResult:(NSString *)result
{
    @{QreaderImpl.Picked(string):Call(result)};
    [self.uivc dismissViewControllerAnimated:YES completion:nil];
}

```

UNO code

```auto
public static void Picked (string result) {
		InProgress = false;
		FutureResult.Resolve(result);
	}

```

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 18, 2016, 11:30am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/5 "2016-10-18T11:30:33Z")

</div>

Ah, it’s in an external Objective-C++ (`.mm`) source file, and not in an Uno file. To use UXL macros (the `@{...}` bit in your code) to call back to Uno from such a file you have to add the `uObjC.Foreign.h` include yourself, as mentioned in [the docs](https://www.fusetools.com/docs/native-interop/foreign-code#external-source-files).

---

<div class="post-metadata">

**Author:** ![Sahal\_Zain](https://avatars.discourse-cdn.com/v4/letter/s/d2c977/32.png) [@Sahal\_Zain](https://forums.fusetools.com/u/Sahal_Zain)\
**Post date:** [October 18, 2016, 11:52am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/6 "2016-10-18T11:52:01Z")

</div>

Hi,

Yes, you are correct, sorry I didn’t notice that since this was not the case with previous build (0.20). The error is gone now. Thanks 🙂

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 20, 2016, 5:51pm UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/7 "2016-10-20T17:51:55Z")

</div>

Hi and sorry for the late reply,

I added

```auto
#import "uObjC.Foreign.h"

```

at the beginning of the .mm file, but Xcode shows the same error (uObjC.h file not found).

I am using this example: [https://github.com/bolav/fuse-camerapanel](https://github.com/bolav/fuse-camerapanel), imported in my main project as an external project.  
In the external project’s .unoproj file there is:

```auto
"RootNamespace":"",
    "Packages": [
    "Fuse",
    "FuseJS",
    "Android",
    "Uno.Permissions"
  ],
  "Includes": [
    "./*.uno",
    "./*.uxl",
    "FuseCameraImpl.h:ObjCHeader:iOS",
    "FuseCameraImpl.mm:ObjCSource:iOS",
    "CameraAndroid.java:Java:Android"
  ]

```

Thanks for your support,

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 7:33am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/8 "2016-10-21T07:33:05Z")

</div>

Hey!

That’s not the same error as above, though it looks similar, so the fix above might not work for you.

The file `uObjC.h` comes from a part of our automatically generated iOS library bindings (which are deprecated in favour of foreign code), but the project doesn’t actually reference the package that includes the file. From a quick glance it looks like the include might not actually be necessary and/or can be replaced with `uObjC.Foreign.h`. If it turns out it’s needed it should work after adding `ObjC` to the `Packages` list in the unoproj.

Hope that helps!

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 8:27am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/9 "2016-10-21T08:27:38Z")

</div>

Hi Olle and thanks for the quick reply,

In the project, the .mm file is used by an .uxl as follows, where uObjC is tagged as required include:

```auto
<Extensions Backend="CPlusPlus" Condition="iOS">
	<CopyFile HeaderFile="FuseCameraImpl.h" />
	<ProcessFile SourceFile="FuseCameraImpl.mm" />
    <Type Name="CameraImpl">
    	<Set FileExtension="mm" />
    	<Require Entity="Uno.Action" />
       	<Require Entity="ObjC.Object" />
       	<Require Source.Import="FuseCameraImpl.h" />
       	<Require Source.Include="uObjC.h" />
       	<Method Signature="allocateCamera():ObjC.ID">
...

```

I first tried to remove the uObjC.h include line, but got the same error in Xcode (uObjC.h file not found).

Then, I reverted the delete and added ObjC to the .unoproj as follows, but the error is still there,

```auto
{
  "RootNamespace":"",
    "Packages": [
    "Fuse",
    "FuseJS",
    "Android",
    "Uno.Permissions",
    "ObjC"
  ],
  "Includes": [
    "./*.uno",
    "./*.uxl",
    "FuseCameraImpl.h:ObjCHeader:iOS",
    "FuseCameraImpl.mm:ObjCSource:iOS",
    "CameraAndroid.java:Java:Android"
  ]
}

```

Maybe I am adding it wrong?

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 8:31am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/10 "2016-10-21T08:31:50Z")

</div>

Hey again!

Can you try `uno clean` before building again? I can’t see where else that file is included.

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 9:15am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/11 "2016-10-21T09:15:08Z")

</div>

Hey, so I tried uno clean, uno build each time with the following changes:

- adding “ObjC” to the .unoproj file
- removing

```auto
<Require Source.Include="uObjC.h" />

```

from the .uxl file

- replacing it by

```auto
<Require Source.Include="uObjC.Foreign.h" />

```

the initial error disappeared but I get:

 ![file](https://s3.us-east-2.amazonaws.com/fuse-legacy-forum-assets/YP2lDbkRYrge-image-1477041174919.07.23.png)

in the .mm file in Xcode 😕

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 9:17am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/12 "2016-10-21T09:17:28Z")

</div>

Now you’re running into the problem of the original post, so try adding `#include <uObjC.Foreign.h>` to `FuseCameraImpl.mm`. 🙂

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 9:44am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/13 "2016-10-21T09:44:28Z")

</div>

Oh! I tried that, but the errors remain TT, having:

.unoproj:

```auto
{
  "RootNamespace":"",
    "Packages": [
    "Fuse",
    "FuseJS",
    "Android",
    "Uno.Permissions",
    "ObjC"
],
  "Includes": [
    "./*.uno",
    "./*.uxl",
    "FuseCameraImpl.h:ObjCHeader:iOS",
    "FuseCameraImpl.mm:ObjCSource:iOS",
    "CameraAndroid.java:Java:Android"
  ]
}

```

.mm:

```auto
#import <CoreVideo/CVOpenGLESTextureCache.h>
#import "FuseCameraImpl.h"
#include <uObjC.Foreign.h>
#import <OpenGLES/ES2/glext.h>
...

```

.uxl:

```auto
<Extensions Backend="CPlusPlus" Condition="iOS">
	<CopyFile HeaderFile="FuseCameraImpl.h" />
	<ProcessFile SourceFile="FuseCameraImpl.mm" />
    <Type Name="CameraImpl">
    	<Set FileExtension="mm" />
    	<Require Entity="Uno.Action" />
       	<Require Entity="ObjC.Object" />
       	<Require Source.Import="FuseCameraImpl.h" />        
       	<Require Source.Include="uObjC.h" /> Or/And <Require Source.Include="uObjC.Foreign.h" />

```

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 9:49am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/14 "2016-10-21T09:49:13Z")

</div>

It looks like the error is in `FuseCameraImpl.mm`, so add the include there.

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 9:56am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/15 "2016-10-21T09:56:42Z")

</div>

Sorry I was not clear, the .mm file code snippet in my previous response corresponds to FuseCameraImpl.mm

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 9:59am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/16 "2016-10-21T09:59:03Z")

</div>

Ah, sorry, I misunderstood that part. Is the error exactly the same or something new? Remember to clean as well. 🙂

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 10:10am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/17 "2016-10-21T10:10:11Z")

</div>

Yes, with the configuration above the errors are:

 ![file](https://s3.us-east-2.amazonaws.com/fuse-legacy-forum-assets/yAmrPepyTSjk-image-1477044436819.06.05.png)

Even getting parse errors, for instance, the last one saying the last } should be removed, when I don`t think it should:

```auto
- (void)captureOutput:(AVCaptureOutput *)captureOutput 
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
       fromConnection:(AVCaptureConnection *)connection
{
    if (_textureHandle)
        CFRelease(_textureHandle);
        
     if (_videoTextureCache)
        CVOpenGLESTextureCacheFlush(_videoTextureCache, 0);
    
    uAutoReleasePool pool; // Do we need this???
	CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    _textureWidth = CVPixelBufferGetWidth(pixelBuffer);
    _textureHeight = CVPixelBufferGetHeight(pixelBuffer);
    
    if (!_videoTextureCache)
    {
        NSLog(@"No video texture cache");
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    CVReturn err = CVOpenGLESTextureCacheCreateTextureFromImage(
        kCFAllocatorDefault,
        _videoTextureCache,
        pixelBuffer,
        NULL,
        GL_TEXTURE_2D,
        GL_RGBA,
        (GLsizei)_textureWidth,
        (GLsizei)_textureHeight,
        GL_BGRA_EXT,
        GL_UNSIGNED_BYTE,
        0,
        &_textureHandle);

    // Check orientation of device
    // Check orientation of frame
    _textureOrientation = connection.videoOrientation;
    // NSLog(@"%d", connection.videoOrientation);

    // Rotate frame

    if (err)
    {
        NSLog(@"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);
        //if (vs->ErrorHandler)
        //{
        // @{Uno.Action:Of(vs->ErrorHandler):Call()};
        //}
    }

    glBindTexture(CVOpenGLESTextureGetTarget(_textureHandle), CVOpenGLESTextureGetName(_textureHandle));
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
    // CVBufferRelease(pixelBuffer);
    // Set Texture of Camera
    int _th = CVOpenGLESTextureGetName(_textureHandle);
    [self setTexture:_th];
    // Call callbackhandler
    if(_callback != NULL)
    {
        @{Uno.Action:Of(_callback):Call()};
    }
}

```

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 11:02am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/18 "2016-10-21T11:02:47Z")

</div>

Looks like there’s a macro in a comment that goes a bit wild when it’s expanded.

Try removing the following:

```auto
        //if (vs->ErrorHandler)
        //{
        // @{Uno.Action:Of(vs->ErrorHandler):Call()};
        //}

```

---

<div class="post-metadata">

**Author:** ![Marc](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Marc](https://forums.fusetools.com/u/Marc)\
**Post date:** [October 21, 2016, 11:38am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/19 "2016-10-21T11:38:32Z")

</div>

Ok, I removed all the commented code blocks in the .mm file.  
There are only 2 errors now:

 ![file](https://s3.us-east-2.amazonaws.com/fuse-legacy-forum-assets/ToX04lggwHm0-image-1477049897540.37.51.png)

---

<div class="post-metadata">

**Author:** ![Olle\_Fredriksson](https://avatars.discourse-cdn.com/v4/letter/o/e95f7d/32.png) [@Olle\_Fredriksson](https://forums.fusetools.com/u/Olle_Fredriksson)\
**Post date:** [October 21, 2016, 11:50am UTC](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470/20 "2016-10-21T11:50:39Z")

</div>

It looks like those files are not written with Foreign Objective-C in mind since you’re getting type errors, so you might have a better time if you set filetype to `CSource` and `CHeader` instead of `ObjCSource` and `ObjCHeader` in the unoproj. UXL macros are expanded in a way that’s compatible with foreign code if you use `ObjCSource/Header`, doing some boxing and unboxing of objects automatically. But it looks like this code is written assuming the macro expansion is just the plain expansion that we do for C and C++.

[Next page](https://forums.fusetools.com/t/missing-uobjc-from-global-namespace-ios-foreign-code/6470.md?page=2)