Thanks, really appreciate your help. Now I am clear and wait for the 64-bit SDK.

Thanks bugra for the updates, I used the otool to check the .dylibs of Sketchup SDK, the CPU type is I386.
Do you have any plan to publish 64-bit sdk in the future?

Hello Sketchup expert, does anyone build the program with Sketchup sdk under Mac OS X, I did a simple sample with Sketchup sdk, but I got the following error message when link the sketchup .dylib

libCommonGeometry.dylib, file was built for unsupported file format ( 0xce 0xfa 0xed 0xfe 0x 7 0x 0 0x 0 0x 0 0x 3 0x 0 0x 0 0x 0 0x 6 0x 0 0x 0 0x 0 ) which is not the architecture being linked (x86_64):
libCommonImage.dylib, file was built for unsupported file format ( 0xce 0xfa 0xed 0xfe 0x 7 0x 0 0x 0 0x 0 0x 3 0x 0 0x 0 0x 0 0x 6 0x 0 0x 0 0x 0 ) which is not the architecture being linked (x86_64):

My OS is Mac OS 10.8.