API call help

spacebuddy · **Joined:** Thu Jul 02, 2009 5:42 am **Posts:** 170

I am trying to call an API (NSOpenPanel) but running into problems.

I want to replace OpenFileRequester with NSOPenPanel. Any API gurus here

Fred · **Posted:** Tue Aug 09, 2011 10:44 am

Unfortunately, NSOPenPanel is Cocoa (objectiveC) and this is not accessible trough PB. The 'easier' is your really need it is to write a small wrapper in ObjectiveC which expose a C function and then call it from PB

wilbert · **Posted:** Tue Aug 09, 2011 4:47 pm

Fred is right, it's Cocoa.

Polo · **Posted:** Tue Aug 09, 2011 5:05 pm

By the way...

How would you convert a PB string to a NSString?

This is what I do:

Code:

void function (const char* pbstring)
{
NSString string = [NSString stringWithUTF8String: string];
}

When PB is in non unicode mode, it works if there aren't any special character in the PB String (ie éèë...)
When PB is in unicode mode, it only gets the first letter of the PB string into the NSString.

Any solution?

wilbert · **Posted:** Tue Aug 09, 2011 5:12 pm

Polo wrote:

How would you convert a PB string to a NSString?

It's easier to use

NSString * string = [NSString stringWithFormat:@"%S", pbstring];

when unicode is used and

NSString * string = [NSString stringWithFormat:@"%s", pbstring];

when unicode is not used. That way you can use a static variable you set once that contains the format ( @"%S" or @"%s" ) and use the same convert function all the time.

Polo · **Posted:** Tue Aug 09, 2011 5:13 pm

Using Cocoa panels in PB, that's quite easy, just link your app with cocoa

ImportC "/System/Library/Frameworks/Cocoa.framework/Cocoa"
EndImport
ImportC "/System/Library/Frameworks/AppKit.framework/AppKit"
EndImport

(last one is just in case

)

Create a static library with Xcode with the ObjC code you need, like this for instance, and import the C function in PB.
(you'd still need to handle the string conversion to make the panel customisable, which i didn't in the example below)

Code:

void mOpenFileRequester()
{
NSString *title = "Requester title";
NSString *directory = "";
NSString *file = "";
NSString *extensions = "";

currentwin=[NSApp keyWindow];
if ( !currentwin ) [NSApp activateIgnoringOtherApps:YES];
    
NSOpenPanel *panel=[NSOpenPanel openPanel];
[panel setTitle:title];
      
if ( [panel runModalForDirectory:directory file:file types:extensions]==NSFileHandlingPanelOKButton )
{
  NSString *fileselected=[[panel filename] UTF8String];
}
   
if ( currentwin ) [currentwin makeKeyWindow];
}

Polo · **Posted:** Tue Aug 09, 2011 5:20 pm

Cheers wilbert, works great!

Khorus · **Joined:** Sat Nov 13, 2010 11:22 pm **Posts:** 23

I'd like to do the same (calling a Cocoa API). I need to access CoreMIDI to do some real-time MIDI. I used the WinAPI on Windows but it looks like a different game on MacOS X. Thanks!

PureBasic Forum

API call help

Who is online