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From: Christian Walther <>
Date: Wed, 28 Dec 2005 12:13:20 +0100
Subject: [SDL] Fix for opening documents on Mac OS X < 10.4

The current code in SDLMain.m that transforms documents opened from the
Finder into command-line arguments (introduced in revision 1.14,
2005-08-11) uses the methods -[NSString lengthOfBytesUsingEncoding:] and
-[NSString getCString:maxLength:encoding:], which are only available in
Mac OS X 10.4.

Compiling this code on 10.3 produces warnings, and running it (i.e.
starting an SDL application by opening a document) leads to weird
behavior which I didn't investigate in detail ("*** -[NSCFString
lengthOfBytesUsingEncoding:]: selector not recognized" is printed to the
console log, and the SDL window never opens).

The attached patch removes the offending calls and uses -[NSString
UTF8String] instead, which is available everywhere. Tested on 10.3.9,
and I see no reason why it shouldn't also work on 10.2 and 10.4.

Two further comments:

* The comment above the -[SDLMain application: openFile:] implementation
says "You need to have a CFBundleDocumentsType section in your
Info.plist to get this message, apparently." This is not the case in my
experience - it worked just fine with a hand-built bare-bones
application consisting only of, without any
Info.plist (although you have to press the option and command keys for
such an application to accept a dragged file).

* I took the liberty of cleaning up another area of SDLMain.m: I changed
"CustomApplicationMain (argc, argv)" to "CustomApplicationMain (int
argc, char **argv)". This avoids the "type of `argv' defaults to `int'"
warnings, and I'm not sure if leaving out the types could cause problems
on platforms where an int and a char** aren't of the same size.

  • Loading branch information
icculus committed Jan 1, 2006
1 parent 945ceb2 commit e8bf3184587504307c3ead7cfd51f0d9f8c43438
Showing with 7 additions and 12 deletions.
  1. +7 −12 src/main/macosx/SDLMain.m
@@ -190,7 +190,7 @@ static void setupWindowMenu(void)

/* Replacement for NSApplicationMain */
static void CustomApplicationMain (argc, argv)
static void CustomApplicationMain (int argc, char **argv)
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
SDLMain *sdlMain;
@@ -251,8 +251,8 @@ - (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filenam
if (gCalledAppMainline) /* app has started, ignore this document. */
return FALSE;

unsigned buflen = [filename lengthOfBytesUsingEncoding:NSUTF8StringEncoding] + 1;
char *arg = (char *) malloc(buflen);
const char *temparg = [filename UTF8String];
char *arg = (char *) malloc(strlen(temparg) + 1);
if (arg == NULL)
return FALSE;

@@ -264,15 +264,10 @@ - (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filenam
gArgv = newargv;

BOOL rc = [filename getCString:arg maxLength:buflen encoding:NSUTF8StringEncoding];
if (!rc)
gArgv[gArgc++] = arg;
gArgv[gArgc] = NULL;
return rc;
strcpy(arg, temparg);
gArgv[gArgc++] = arg;
gArgv[gArgc] = NULL;
return TRUE;

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