ZipArchive library compile error

Question

i have included libz.1.2.3.dylib

after insert code

ZipArchive* za = [[ZipArchive alloc] init];

error when compile

 "_OBJC_CLASS_$_ZipArchive", referenced from:

UPDATE

according to http://code.google.com/p/ziparchive/wiki/PageName

i have include ZipArchive folder to project, and and framework libz.1.2.3.dylib.

then i try to unzip file on iphone but it error about framework. how to resolve it?

Ld build/ePUBreader.build/Debug-iphoneos/ePUBreader.build/Objects-normal/armv7/ePUBreader normal armv7
cd /Users/ragopor/Desktop/ePUBreader
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk -L/Users/ragopor/Desktop/ePUBreader/build/Debug-iphoneos -F/Users/ragopor/Desktop/ePUBreader/build/Debug-iphoneos -filelist /Users/ragopor/Desktop/ePUBreader/build/ePUBreader.build/Debug-iphoneos/ePUBreader.build/Objects-normal/armv7/ePUBreader.LinkFileList -dead_strip -miphoneos-version-min=4.0 -framework Foundation -framework UIKit -framework CoreGraphics -framework StoreKit -lz.1.2.3 -o /Users/ragopor/Desktop/ePUBreader/build/ePUBreader.build/Debug-iphoneos/ePUBreader.build/Objects-normal/armv7/ePUBreader

Undefined symbols:
  "_OBJC_CLASS_$_ZipArchive", referenced from:
      objc-class-ref-to-ZipArchive in ePUBreaderAppDelegate.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Answer 1

Then just drag & drop ZipArchive folder in to xCode "Classes".

Then add framework libz.1.2.3.dylib.

That's it. My code get compile without any issue.

Answer 2

When you drag the ZipArchive folder into your project, you have to choose "Create groups for any added folders" and not "Create folder references for any added folders." If you choose the latter, you'll get the Undefined Symbol error from the linker.