在非常基本的程序上，佳能EDSDK在Mac OS 10.7.5上因EXC_BAD_ACCESS崩溃

Question

I am trying to write a console based application to access a Canon camera on Mac OS X 10.7.5. I am using XCode version 4.6 for the same. This is the program I am trying to write

#import <Foundation/Foundation.h>
#include "EDSDK.h"
#include "EDSDKErrors.h"
#include "EDSDKTypes.h"


int main()
{
    @autoreleasepool {
        EdsError error = EDS_ERR_OK;
        EdsCameraListRef cameraList = NULL;
        EdsUInt32 count = 0;
        EdsDeviceInfo deviceInfo;
        bool isSDKLoaded;

        // Initialization of SDK
        error = EdsInitializeSDK();

        //Acquisition of camera list
        if(error == EDS_ERR_OK)
        {
            isSDKLoaded = YES;
            error = EdsGetCameraList(&cameraList);
        }
        if(cameraList != NULL) {
            EdsRelease(cameraList);
            cameraList = NULL;
        }

    }
    return 0;
}

It compiles successfully but when I run the program it crashes when the EdsGetCameraList function returns. The error shown is 'dyld misaligned_stack_error'. I understand that this has something to do with the fact that MacOS X wants the stack to be 16-byte aligned. The SDK I am using is only available for 32 bit architectures and hence, I have set the architecture accordingly. I tried setting the "Other C flags" under Build Settings in XCode to include the flag "-falign-stack=assume-16-byte" as well.

The sample that came along with the Canon EDSDK works fine. The version of the SDK being used is the one developed by Canon in 2006-2007 updated on 06-03-16. I have no other version information on it.

Following is the dump from the logs : http://pastebin.com/vfDWeZnr

What could I be possibly doing wrong?

I am really new to Objective-C and hence, the mix up of C and Objective-C code.

Thanks!

Answer 1

Are you sure that you don't need to initialize cameraList ? I imagine that the function wants to write to the address you supply but that points to NULL , hence the error. In C I'd use malloc() here to obtain a pointer but I don't know the equivalent for objective-C.