Determining Extracted File Size

jfellis · 22nd August 2006, 03:59

Hi,

Is there any way to determine how much space will be required for a zip file to be successfully extracted. I have a zip file on a CD that I would like to extract and install on the hard drive IF there is enough space on the hard drive. I would like to display the correct extracted space requirement on the installer. I can only get the size of the zipped file, so how do I know if there will be enough space when I unzip it?

Thanks. Great product and great Forum!!

JasonFriday13 · 22nd August 2006, 23:57

If you are using the ZipDll plugin, check the help file for a 'getzipsize' or similar function, and execute it in .oninit. To add that size to a section, use AddSize.

Section blah
AddSize "$0" ; $0 is the variable you
; stored the size of the zip in.
SectionEnd

Comperio · 23rd August 2006, 04:41

If you use a 3rd party command line zip tool like 7-zip or Info-Zip, you might find a function to get the size (although maybe not directly).

For example, 7zip does not have anthing that just returns the size, but if you issue this command:
7za l archive.zip > c:\temp\list.txt

you'll get the contents of the archive "archive.zip" to the file "C:\temp\list.txt") in which the the 2nd to the last line contains the total size (in bytes) of the zip archive. Once you have that, you could write a function that would open the file and read the info out of it. (Check the plugins page for some functions to help you.)

Other zip utilities might offer something similiar.

Or, if you are the one packing the zip file in the first place, just unzip the archive on your own to figure out its size and then add the size your installation as JasonFriday13 suggested.

22nd August 2006, 03:59	#1
jfellis Junior Member Join Date: Nov 2004 Posts: 8	Determining Extracted File Size Hi, Is there any way to determine how much space will be required for a zip file to be successfully extracted. I have a zip file on a CD that I would like to extract and install on the hard drive IF there is enough space on the hard drive. I would like to display the correct extracted space requirement on the installer. I can only get the size of the zipped file, so how do I know if there will be enough space when I unzip it? Thanks. Great product and great Forum!!

22nd August 2006, 23:57	#2
JasonFriday13 Senior Member Join Date: May 2005 Location: Taranaki, New Zealand Posts: 400	If you are using the ZipDll plugin, check the help file for a 'getzipsize' or similar function, and execute it in .oninit. To add that size to a section, use AddSize. Section blah AddSize "$0" ; $0 is the variable you ; stored the size of the zip in. SectionEnd "Only a MouseHelmet will save you from a MouseTrap" -Jason Ross (Me) Wiki Profile

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23rd August 2006, 04:41	#3
Comperio Major Dude Join Date: Jan 2005 Location: Oregon Coast Posts: 737	If you use a 3rd party command line zip tool like 7-zip or Info-Zip, you might find a function to get the size (although maybe not directly). For example, 7zip does not have anthing that just returns the size, but if you issue this command: *7za l archive.zip > c:\temp\list.txt* you'll get the contents of the archive "archive.zip" to the file "C:\temp\list.txt") in which the the 2nd to the last line contains the total size (in bytes) of the zip archive. Once you have that, you could write a function that would open the file and read the info out of it. (Check the plugins page for some functions to help you.) Other zip utilities might offer something similiar. Or, if you are the one packing the zip file in the first place, just unzip the archive on your own to figure out its size and then add the size your installation as JasonFriday13 suggested.