This is invocation.m in view mode; [Download] [Up]
/* A demonstration of writing and reading with NSArchiver */
#include <gnustep/base/Invocation.h>
#include <gnustep/base/Array.h>
#include <gnustep/base/Archiver.h>
#include <Foundation/NSValue.h>
#include <gnustep/base/TextCStream.h>
@interface NSNumber (printing)
- (void) print;
- printAddNumber: n;
@end
@implementation NSNumber (printing)
- (void) print
{
printf("%d\n", [self intValue]);
}
- printAddNumber: n
{
printf("%d\n", [self intValue] + [n intValue]);
return self;
}
@end
int main()
{
id obj;
id inv;
id array;
int i;
BOOL b;
/* Create a simple invocation, and get it's return value. */
obj = [NSObject new];
inv = [[MethodInvocation alloc]
initWithTarget: obj selector: @selector(isInstance)];
[inv invoke];
[inv getReturnValue: &b];
printf ("object is instance %d\n", (int)b);
[inv release];
/* Do a simple invocation on all the contents of a collection. */
array = [Array new];
for (i = 0; i < 5; i++)
[array addObject: [NSNumber numberWithInt: i]];
inv = [[MethodInvocation alloc]
initWithSelector: @selector(print)];
printf ("The numbers\n");
[array withObjectsInvoke: inv];
[inv release];
/* Do an invocation on all the contents of the array, but the
array contents become the first object argument of the invocation,
not the target for the invocation. */
inv = [[ObjectMethodInvocation alloc]
initWithTarget: [NSNumber numberWithInt: 2]
selector: @selector(printAddNumber:), nil];
printf ("The numbers adding 2\n");
[array withObjectsInvoke: inv];
/* Get an int return value in a way that is simpler than -getReturnValue: */
printf ("The target number was %d\n", [inv intReturnValue]);
[inv release];
/* Use a function instead of a selector for the invocation.
Also show the use of filtered enumerating over a collection. */
{
id inv2;
id test_func (id o)
{
printf ("test_func got %d\n", [o intValue]);
return [NSNumber numberWithInt: [o intValue] + 3];
}
inv = [[ObjectFunctionInvocation alloc]
initWithObjectFunction: test_func];
inv2 = [[MethodInvocation alloc] initWithSelector: @selector(print)];
[array withObjectsTransformedByInvoking: inv
invoke: inv2];
[inv release];
[inv2 release];
}
/* Archive the some invocations, read them back and invoke. */
{
inv = [[MethodInvocation alloc]
initWithTarget: array
selector: @selector(withObjectsInvoke:),
[[[MethodInvocation alloc] initWithSelector: @selector(print)]
autorelease]];
printf ("Before archiving\n");
[inv invoke];
[Archiver setDefaultCStreamClass: [TextCStream class]];
[Archiver encodeRootObject: inv withName: NULL toFile: @"invocation.txt"];
[inv release];
printf ("After archiving\n");
inv = [Unarchiver decodeObjectWithName: NULL
fromFile: @"invocation.txt"];
[inv invoke];
}
exit(0);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.