On Aug 29, 2018, at 9:47 PM, Gerriet M. Denkmann <g@...> wrote:

macOS 13.6

The app has Assets.xccassets/AppIcon and shows a nice icon in the dock.

But an NSAlert just shows a boring alert-triangle.
I want it to display the icon of my app instead.

So I did:
NSImage *myAppImage = [ [NSApplication sharedApplication] applicationIconImage ];
NSLog(@"%s myAppImage: %@", __FUNCTION__, myAppImage);

myAppImage: <NSImage 0x60000007cb40 Size={128, 128} Reps=(
"<NSCGImageSnapshotRep:0x608000461b40 cgImage=<CGImage 0x6080001c3de0>\n\t<<CGColorSpace 0x6000000a04e0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; Color LCD)>\n\t\twidth = 256, height = 256, bpc = 8, bpp = 32, row bytes = 1024 \n\t\tkCGImageAlphaPremultipliedFirst | kCGImageByteOrder32Little \n\t\tis mask? No, has mask? No, has matte? No, should interpolate? Yes>"
)>

[alert setIcon: myAppImage];

And now I get an even more boring default app image (paper with 2 pencils).
I really want the nice app image as shown in the dock.

There must be a simple answer (which becomes immediately obvious once known) to this.


Gerriet.

On Aug 29, 2018, at 20:47 , Gerriet M. Denkmann <g@...> wrote:

There must be a simple answer (which becomes immediately obvious once known) to this.

If you want to get the actual app icon, I think the simplest way is to get the URL for your app bundle, then get the URL resource key for the icon (https://developer.apple.com/documentation/foundation/urlresourcekey/1414697-effectiveiconkey).

There’s also a NSWorkspace method to get the icon for a file.

And — I’ve never tried — you may be able to use NSDataAsset to peek into the asset catalog directly.

But I wouldn’t bother. It’s easier to add a separate copy of the actual image to an asset catalog *as an image*, and to use [NSImage imageNamed:] to get it. That puts the resolution/size under your control, and you can customize the image (e.g. sub-badging it with a caution or error icon) if you decide you need to, and it’s one line of code to get.

On Aug 30, 2018, at 1:07 AM, Gerriet M. Denkmann <g@...> wrote:

On 30 Aug 2018, at 12:13, Quincey Morris <quinceymorris@...> wrote:

On Aug 29, 2018, at 20:47 , Gerriet M. Denkmann <g@...> wrote:

There must be a simple answer (which becomes immediately obvious once known) to this.

If you want to get the actual app icon, I think the simplest way is to get the URL for your app bundle,

I failed to find this. Probably missed something obvious.

But I stumbled upon:

NSRunningApplication *currentApplication = NSRunningApplication.currentApplication;
NSImage *myAppImage = currentApplication.icon;

Which is exactly what I needed.

then get the URL resource key for the icon (https://developer.apple.com/documentation/foundation/urlresourcekey/1414697-effectiveiconkey).

There’s also a NSWorkspace method to get the icon for a file.

And — I’ve never tried — you may be able to use NSDataAsset to peek into the asset catalog directly.

Also tried this (and failed miserably):

All these just return nil:
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @"AppIcon" ]; // nil
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @"Assets" ]; // nil
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @"Assets.xcassets" ]; // nil
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @"Assets" bundle: NSBundle.mainBundle]; // nil
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @"Assets.xcassets" ]; // nil
//NSDataAsset *ass = [[ NSDataAsset alloc] initWithName: @“AppIcon" bundle: NSBundle.mainBundle]; // nil

The last one writes the message:
[framework] CoreUI: attempting to lookup a named data 'AppIcon' with a type that is not a data type in the AssertCatalog

Then I gave up.

Kind regards,

Gerriet.