Understanding Xcode build errors from using Objective-C runtime function in OS X's Foundation app template.
Understanding Xcode build errors from using Objective-C runtime function in OS X's Foundation app template.
- Subject: Understanding Xcode build errors from using Objective-C runtime function in OS X's Foundation app template.
- From: George Warner <email@hidden>
- Date: Thu, 30 May 2013 10:38:36 -0700
On May 29, 2013, at 9:32 PM, email@hidden wrote:
> I'm learning how to use the Objective-C runtime function. To do this, I used Xcode Version 4.6.2 (4H1003) and chose from the OS X's Foundation template to create a new project with sample code I found in Apple's documentation.
I didn't see your jpeg file (<XcodeScreenSnapz001.jpeg>) but when I put your code into an empty Xcode project I only got one build error and fixed it by typecasting malloc's returned value to (Class *).
void listObjectiveC_ClassesUsedInThisApp(void)
{
int numClasses;
Class * classes = NULL;
classes = NULL;
numClasses = objc_getClassList(NULL, 0);
if (numClasses > 0 )
{
classes = (Class *) malloc(sizeof(Class) * numClasses); // <<== added typecast to (Class *)
numClasses = objc_getClassList(classes, numClasses);
printf("This application has %u classes. Note that you cannot assume these classes inherit from NSObject.\n", numClasses);
free(classes);
}
}
Note: I also changed your source file's ("ObjectiveCRuntime.c") extension to ".m" (ObjectiveCRuntime.m); otherwise Xcode tried to compile the Foundation and ObjectiveCRuntime (ObjC) headers with C instead of ObjC; you can also fix this by selecting your source file in your project's "Project Navigator" view and then in the "File Inspector" view change your source files type to "Objective-C Source".
--
Enjoy,
George Warner, x4-0668
Schizophrenic Optimization Scientist
Apple Developer Technical Support (DTS)
eMail: <email@hidden>
iChat: <email@hidden>
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