Trouble going from iOS Simulator to iOS

[Guthook]

I finally paid for a developer account so I can start testing my app on my iphone, after many months just using the simulator, and I'm having trouble getting something to work.

My app uses code from this demo to display a map, and the problem seems to arise from the three20 files. When I build the app for the simulator, everything works fine. When I build it for "device" it fails with the error code:

/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

Clicking on the more info button, it says it can't find the libThree20Network.a and libThree20Core.a files... it's looking for them in the directory:
[my projects folder]/three20/Build/Products/Debug-iphoneos/libThree20Core.a
Looking in the three20 folder, the two missing files are in "Debug-iphonesimulator" instead of "Debug-iphoneos" folder. I tried switching the name of the folder, but that resulted in many more errors. No simple fix there.

Sigh... And just using the simulator seemed so simple!
Can anybody lend their expertise to help me figure out what I'm doing wrong?

[Rifts]

instead of using a demo why don't you just create an empty app and try to get it to run on your phone?

[Guthook]

Originally Posted by Rifts

instead of using a demo why don't you just create an empty app and try to get it to run on your phone?

Not sure I understand how this would solve anything. Do you mean just make an app that does nothing and run it on the iphone to show that something should run?

From the error message I got it doesn't sound like the problem lies in the code so much as an issue with the missing .a files. Is there a way to fix the missing files problem?

[Duncan C]

Originally Posted by Guthook

I finally paid for a developer account so I can start testing my app on my iphone, after many months just using the simulator, and I'm having trouble getting something to work.

My app uses code from this demo to display a map, and the problem seems to arise from the three20 files. When I build the app for the simulator, everything works fine. When I build it for "device" it fails with the error code:

/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

Clicking on the more info button, it says it can't find the libThree20Network.a and libThree20Core.a files... it's looking for them in the directory:
[my projects folder]/three20/Build/Products/Debug-iphoneos/libThree20Core.a
Looking in the three20 folder, the two missing files are in "Debug-iphonesimulator" instead of "Debug-iphoneos" folder. I tried switching the name of the folder, but that resulted in many more errors. No simple fix there.

Sigh... And just using the simulator seemed so simple!
Can anybody lend their expertise to help me figure out what I'm doing wrong?

I haven't used three20 before, so I can't give you specifics about making that library work.

However, I can tell you what's going wrong in general.

Third party code libraries need to be built separately for the simulator and the device. Under the covers, the machine code for the simulator is 80x86 code, and for the iOS device, it's Arm6 and/or Arm7 code. At link time, your app needs to have the correct flavor of the library(s) you're using or the app won't build.

You should have a three20 directory structure that has Debug-iphoneos and Debug-iphonesimulator directories. Each of those directories will contain the library files for that platform. You can't just rename the simulator directory with the iOS directory name, because the simulator files won't work for iOS devices.

[Guthook]

Thanks Duncan. I did some more exploring and found that the folder with the iphone OS files was missing from the three20 directory I had imported, but I re-downloaded the one from the demo and found the missing file there. Copied into my folder, and everything works now. I finally have evidence on my iPhone that I haven't just been wasting hundreds of hours in xcode!