objective-c - 如何在 Cocoa 中通知 SD 卡被移除或重新插入

Question

我想检查 Cocoa 应用程序中何时移除或重新插入 SD 卡。我怎样才能做到这一点？我尝试使用以下代码，但显示错误:

    static void diskAppearedCallback(DADiskRef disk, void* context)
{
    CFDictionaryRef description = DADiskCopyDescription(disk);
    NSLog(@"Disk appeared: %@", description);
    CFRelease(description);
}

int main(int argc, char **argv)
{
    DASessionRef session = DASessionCreate(kCFAllocatorDefault);
    DARegisterDiskAppearedCallback(session, kDADiskDescriptionMatchVolumeMountable, diskAppearedCallback, 0);
    DASessionScheduleWithRunLoop(session, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);

    CFRunLoopRun();

    return 0;
}

这是一个错误:

 Undefined symbols for architecture i386:
  "_DADiskCopyDescription", referenced from:
      _diskAppearedCallback in TestAppDelegate.o
  "_DARegisterDiskAppearedCallback", referenced from:
      -[TestAppDelegate applicationDidFinishLaunching:] in TestAppDelegate.o
  "_DASessionCreate", referenced from:
      -[TestAppDelegate applicationDidFinishLaunching:] in TestAppDelegate.o
  "_DASessionScheduleWithRunLoop", referenced from:
      -[TestAppDelegate applicationDidFinishLaunching:] in TestAppDelegate.o
  "_kDADiskDescriptionMatchVolumeMountable", referenced from:
      -[TestAppDelegate applicationDidFinishLaunching:] in TestAppDelegate.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

请给我一些建议。提前致谢。

Answer 1

您似乎需要在目标属性中添加 DiskArbitration.framework。