以 xcode4.3 ios sdk 5.1中的电话短信使用的库为例：

路径

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/System/Library/Frameworks/CoreTelephony.framework

在桌面生成

cd /users/你的用户名/desktop
class-dump  -H /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/System/Library/Frameworks/CoreTelephony.framework -o Headers

生成的文件：

bash-3.2# ls
.DS_Store     Headers     Tools     imgs     other
.localized     Localizable.strings    code     lame     电话短信拦截
bash-3.2# pwd
/users/rinjack/desktop
bash-3.2# cd headers
bash-3.2# ls
CDStructures.h     CTCarrier.h     CTMessageAddress-Protocol.h    CTMessageStatus.h     CTTelephonyNetworkInfo.h
CTCall.h     CTEmailAddress.h     CTMessageCenter.h     CTMmsEncoder.h     NSCopying-Protocol.h
CTCallCenter.h     CTMessage.h     CTMessagePart.h     CTPhoneNumber.h
bash-3.2#

红色为在终端中输入的命令，CDStructures.h CTCarrier.h CTMessageAddress-Protocol.h CTMessageStatus.h CTTelephonyNetworkInfo.h
CTCall.h CTEmailAddress.h CTMessageCenter.h CTMmsEncoder.h NSCopying-Protocol.h
CTCallCenter.h CTMessage.h CTMessagePart.h CTPhoneNumber.h 为导出的头文件。