Hi all,

I am studying CFNetwork Programming Guide document these days, and I wrote a
little program with
basic HTTP request and response for testing. However, I can't get this
program to compile, the error
message something like:
Undefined symbols:
  "_CFHTTPMessageCreateRequest", referenced from:

"_kCFHTTPVersion1_1", referenced from:

Then I try to add existing framework to my project (go to project window,
right click the "External
frameworks and libraries" and choose add menu), I add
CoreFoundation.framework and
CoreService.framework and CFNetwork.framework
After that, the situation is getting worse, I recompile my program and
getting 8406 errors.
Some of them are from CFString.h like:

/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFString.h:539:0
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFString.h:539:
error: storage class specified for parameter
'CFStringCreateByCombiningStrings'


And then I delete those new added framework from my project (go to project
window, right click the
framework I want to delete and choose delete command), but nothing changes
when I compile
my program again, I still got 8406 errors.

Now how can I get things right? And how can I compile my program without
errors?
Thanks.

-- 
==========================
Life isn't about finding yourself.
Life is about creating yourself.
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