printPanelDidEnd:returnCode:contextInfo: variable isn't updated

[Kevin Walzer]

I'm implementing basic printing functionality as a library extension to 
a GUI toolkit I use (Tk).. The code uses a custom Cocoa class as the 
delegate for the printPanelDidEnd:returnCode:contextInfo selector (when 
the print dialog is presented as a sheet).

The design of the code is to get the value of the returnCode (NSOKButton 
or NSCancelButton), assign it to a variable, printResult, then take 
action based on the variable (print or return).  I am doing this because 
the  printPanelDidEnd:returnCode:contextInfo selector  isn't supposed to 
return a value. The issue I'm running into is that the selector returns 
immediately and apparently the value of printResult isn't updated in the 
global scope of my code.

 Here's the relevant code:

int printResult;

@interface PrintDelegate: NSObject

-(id) init;

- (void)printPanelDidEnd:(NSPrintPanel *)printPanel 
returnCode:(int)returnCode contextInfo:(void *)contextInfo;

@end

@implementation PrintDelegate

-(id) init {
  self = [super init];
  return self;
}

- (void)printPanelDidEnd:(NSPrintPanel *)printPanel 
returnCode:(int)returnCode contextInfo:(void *)contextInfo {

  printResult = NULL;

 if (returnCode == NSOKButton) {
    printResult = NSOKButton;
    NSLog(@"printResult is OK button!");
  }
  if (returnCode = NSCancelButton) {
    printResult = NSCancelButton;
    NSLog(@"printResult is Cancel button!");
  }

}

@end

And here's the logic in another function of my code:

    [printPanel beginSheetWithPrintInfo:printInfo 
modalForWindow:windowRef delegate:printDelegate 
didEndSelector:@selector(printPanelDidEnd:returnCode:contextInfo:) 
contextInfo:printInfo];

if {printResult = NSOkButton} {
        //do print stuff here
} else {
        return

}

Based on the NSLog statements, I can tell that printResult is being 
correctly updated, but for some reason that value never makes it to the 
other function. I understand the selector method doesn't return a value; 
that's why I'm assigning the value to the printResult variable.  I don't 
believe it should be an error of variable scope, as the variable 
printResult is defined at the global level of the code, outside any 
functions or class definitions.

Any thoughts about what I'm doing wrong here?

Thanks,
Kevin

--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com
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