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Re: Cocoa-dev Digest, Vol 16, Issue 1
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Re: Cocoa-dev Digest, Vol 16, Issue 1


  • Subject: Re: Cocoa-dev Digest, Vol 16, Issue 1
  • From: Vince DeMarco <email@hidden>
  • Date: Tue, 15 Jan 2019 14:43:55 -0800

Here is code that will write it out as a PNG

void WriteImageToPath(CGImageRef image,const char *path)
{
    CGImageDestinationRef dest;
    CFURLRef              url;

    url = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,(const
UInt8 *)path,strlen(path),0);
    dest = CGImageDestinationCreateWithURL(url,CFSTR("public.png"), 1, NULL);

    CGImageDestinationAddImage(dest,image,NULL);
    CGImageDestinationFinalize(dest);
    CFRelease(url);
    CFRelease(dest);
}

To write it out a a jpeg change the UTI type above from public.png ->
public.jpeg


Its all and there should be examples.

Vince


> On Jan 15, 2019, at 2:35 PM, Bruce Stephens <email@hidden> wrote:
>
> Any chance to see those few lines of code for NSimage ImageIO to jpeg?
> Thanks. Bruce.
>
>> On 16 Jan 2019, at 7:00 am, email@hidden wrote:
>>
>> Send Cocoa-dev mailing list submissions to
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>> Today's Topics:
>>
>>  1. NSImage to JPEG file? (Carl Hoefs)
>>  2. Re: NSImage to JPEG file? (Vince DeMarco)
>>  3. Re: NSImage to JPEG file? (Carl Hoefs)
>>  4. Re: NSImage to JPEG file? (Alex Zavatone)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 14 Jan 2019 13:17:41 -0700
>> From: Carl Hoefs <email@hidden>
>> To: Cocoa Developers <email@hidden>
>> Subject: NSImage to JPEG file?
>> Message-ID:
>>   <email@hidden>
>> Content-Type: text/plain; CHARSET=US-ASCII
>>
>> I have a background macOS daemon process (aka Foundation-based "command line
>> tool") that needs to write out a JPEG file to local disk. The image resides
>> in an NSImage object (or alternatively, an NSData of raw RGB image data).
>>
>> Short of resorting to something like libjpeg, what is the ObjC way to do
>> this?
>>
>> -Carl
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Mon, 14 Jan 2019 12:26:08 -0800
>> From: Vince DeMarco <email@hidden>
>> To: Carl Hoefs <email@hidden>
>> Cc: Cocoa Developers <email@hidden>
>> Subject: Re: NSImage to JPEG file?
>> Message-ID: <email@hidden>
>> Content-Type: text/plain; CHARSET=US-ASCII
>>
>> Use ImageIO.
>>
>> create a CGImageDestinationRef and add the CGImage to it.
>>
>> Vince
>>
>>
>>
>>> On Jan 14, 2019, at 12:17 PM, Carl Hoefs <email@hidden>
>>> wrote:
>>>
>>> I have a background macOS daemon process (aka Foundation-based "command
>>> line tool") that needs to write out a JPEG file to local disk. The image
>>> resides in an NSImage object (or alternatively, an NSData of raw RGB image
>>> data).
>>>
>>> Short of resorting to something like libjpeg, what is the ObjC way to do
>>> this?
>>>
>>> -Carl
>>>
>>> _______________________________________________
>>>
>>> Cocoa-dev mailing list (email@hidden)
>>>
>>> Please do not post admin requests or moderator comments to the list.
>>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>>
>>> Help/Unsubscribe/Update your Subscription:
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>>> This email sent to email@hidden
>>
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Mon, 14 Jan 2019 14:48:15 -0700
>> From: Carl Hoefs <email@hidden>
>> To: Vince DeMarco <email@hidden>
>> Cc: Cocoa Developers <email@hidden>
>> Subject: Re: NSImage to JPEG file?
>> Message-ID:
>>   <email@hidden>
>> Content-Type: text/plain; CHARSET=US-ASCII
>>
>> Got it working!
>> Thanks, that's the tip I needed.
>> -Carl
>>
>>
>>> On Jan 14, 2019, at 1:26 PM, Vince DeMarco <email@hidden> wrote:
>>>
>>> Use ImageIO.
>>>
>>> create a CGImageDestinationRef and add the CGImage to it.
>>>
>>> Vince
>>>
>>>
>>>
>>>> On Jan 14, 2019, at 12:17 PM, Carl Hoefs <email@hidden>
>>>> wrote:
>>>>
>>>> I have a background macOS daemon process (aka Foundation-based "command
>>>> line tool") that needs to write out a JPEG file to local disk. The image
>>>> resides in an NSImage object (or alternatively, an NSData of raw RGB image
>>>> data).
>>>>
>>>> Short of resorting to something like libjpeg, what is the ObjC way to do
>>>> this?
>>>>
>>>> -Carl
>>>>
>>>> _______________________________________________
>>>>
>>>> Cocoa-dev mailing list (email@hidden)
>>>>
>>>> Please do not post admin requests or moderator comments to the list.
>>>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>>>
>>>> Help/Unsubscribe/Update your Subscription:
>>>>
>>>> This email sent to email@hidden
>>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Mon, 14 Jan 2019 16:06:54 -0600
>> From: Alex Zavatone <email@hidden>
>> To: Carl Hoefs <email@hidden>
>> Cc: Cocoa Developers <email@hidden>
>> Subject: Re: NSImage to JPEG file?
>> Message-ID: <email@hidden>
>> Content-Type: text/plain; CHARSET=US-ASCII
>>
>> I will send you something.
>>
>> Sent from my iPhone
>>
>>> On Jan 14, 2019, at 2:17 PM, Carl Hoefs <email@hidden>
>>> wrote:
>>>
>>> I have a background macOS daemon process (aka Foundation-based "command
>>> line tool") that needs to write out a JPEG file to local disk. The image
>>> resides in an NSImage object (or alternatively, an NSData of raw RGB image
>>> data).
>>>
>>> Short of resorting to something like libjpeg, what is the ObjC way to do
>>> this?
>>>
>>> -Carl
>>>
>>> _______________________________________________
>>>
>>> Cocoa-dev mailing list (email@hidden)
>>>
>>> Please do not post admin requests or moderator comments to the list.
>>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>>
>>> Help/Unsubscribe/Update your Subscription:
>>>
>>> This email sent to email@hidden
>>
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
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>>
>> ------------------------------
>>
>> End of Cocoa-dev Digest, Vol 16, Issue 1
>> ****************************************
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  • Follow-Ups:
    • Re: Cocoa-dev Digest, Vol 16, Issue 1
      • From: Bruce Stephens <email@hidden>
References: 
 >Re: Cocoa-dev Digest, Vol 16, Issue 1 (From: Bruce Stephens <email@hidden>)

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