NSRunAlertPanel shows up behind the “active window”

问题

I'm trying to put together a simple error reporting package. If my main program crashes, it saves a crashlog, then starts a reporter program. The reporter program asks the user if it can send the crash log to me, then does so. I'm using NSRunAlertPanel to create a basic message box.

For some reason, that message box is showing up buried underneath any other windows that may be open. Run the main package from a Finder window, it shows up on top, force it to crash, the reporter window shows up behind the Finder window.

Why is this happening, and how can it be solved?

Minimal test case:

#import <AppKit/AppKit.h>

int main(int a, char* av) {
  NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
  NSApplication* q = [[NSApplication alloc] init]; 
  NSRunAlertPanel(@"Hello", @"Aloha", @"OK", nil,nil);
  [pool release];
}

Built with:

g++ test.mm -framework AppKit && ./a.out

回答1:

I seem to have come up with a solution, distilled from many tangentially-related webpages:

#import <AppKit/AppKit.h>

int main(int a, char* av) {
  NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
  NSApplication* q = [[NSApplication alloc] init]; 

  ProcessSerialNumber psn = {0, kCurrentProcess};
  TransformProcessType(&psn, kProcessTransformToForegroundApplication);

  [NSApp activateIgnoringOtherApps:YES];

  NSRunAlertPanel(@"Hello", @"Aloha", @"OK", nil,nil);
  [pool release];
}

I do not pretend to understand this - it's cargo cult programming at its finest. Better answers, or explanations of what each step does, would be greatly appreciated.

来源：https://stackoverflow.com/questions/2639479/nsrunalertpanel-shows-up-behind-the-active-window

标签

cocoa

dialog

messagebox

foreground

nsrunalertpanel