macOS Compressing dmg image.....

[vnraju]

how to compress(programmatically) the dmg image ?
any suggestions will be appreciated....
thanx iin advance......

 

[kainjow]

Use hdiutil. Type "hdiutil compress -help" into Terminal, and there are compressed formats you can convert a dmg to. You'll have to call the hdiutil task from your code.

 

[Sherman Homan]

Could I ask why you want to compress it? It is already pretty tightly packed. Recoding it may actually increase its size with the compression envelope you use. Of instance I just zipped the latest GoogleEarth dmg file and it is only 50 kb smaller from the 27 meg original.

 

[Damien]

Why dont developers use Zip more, it's cleaner and easier for the user to mount/unzip than a dmg. No white box rubbish

 

[vnraju]

thanx for responses need some more

 

[mkrishnan]

Why dont developers use Zip more, it's cleaner and easier for the user to mount/unzip than a dmg. No white box rubbish

Probably because DMGs have more user interface features -- they can pop up licensing agreements, for instance, that require acceptance before mounting.

Also disk images implement modern encryption.