Why does this 4 line Cocoa Program not work ?

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Lothar Scholz - 28 Jan 2005 10:46 GMT

int main(int a, char* av) {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
NSRunAlertPanel(@"Title", @"My Message", @"Okay", nil,nil,NULL);
[pool release];
}

It compiles and runs but NSRunAlertPanel does not show a popup.
Any ideas why ?

I need a cocoa wrapper to start an X11 application and if X11 is not
available the wrapper should simply popup a message box. Thats all.

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Patrick Machielse - 28 Jan 2005 12:34 GMT

> int main(int a, char* av) {
> NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
[quoted text clipped - 4 lines]
> It compiles and runs but NSRunAlertPanel does not show a popup.
> Any ideas why ?

I believe this function needs an instance of NSApplication to show your
panel.

> I need a cocoa wrapper to start an X11 application and if X11 is not
> available the wrapper should simply popup a message box. Thats all.

I think you can't use Cocoa. Look at this Carbon function:

StandardAlert

Displays a standard alert box.
OSErr StandardAlert (
AlertType inAlertType,
ConstStr255Param inError,
ConstStr255Param inExplanation,
const AlertStdAlertParamRec * inAlertParam,
SInt16 * outItemHit
);

patrick

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Lothar Scholz - 28 Jan 2005 13:52 GMT

>> int main(int a, char* av) {
>> NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
[quoted text clipped - 7 lines]
>I believe this function needs an instance of NSApplication to show your
>panel.

Yuups, thats it

NSApplication* a = [[NSApplication alloc] init];

in front of the code and it works well.

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Patrick Machielse - 28 Jan 2005 15:20 GMT

> >> int main(int a, char* av) {
> >> NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
[quoted text clipped - 10 lines]
>
> in front of the code and it works well.

I overlooked that option ;-)

patrick

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Mac Forum / Programming / Mac Programming / January 2005

Why does this 4 line Cocoa Program not work ?