• Rick Mann <rmann-d-lang latencyzero.com> Jan 29 2007
• =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb algonet.se> Jan 30 2007
• Lionello Lunesu <lio lunesu.remove.com> Jan 30 2007

Rick Mann <rmann-d-lang latencyzero.com> writes:

I've run into a problem creating D bindings for the Mac OS X Carbon API. In
particular, I'm trying to find a way to implement the following C macro
(context provided):

typedef const struct __CFString * CFStringRef;
#define CFSTR(cStr)  __CFStringMakeConstantString("" cStr "")
CFStringRef  __CFStringMakeConstantString(const char *cStr);	
#define kSomeCFStringConstant      CFSTR("myCFStringConstantValue");

I tried doing this:

struct __CFString {};
typedef const __CFString* CFStringRef;
template CFSTR(char[] inS)
{
	const CFStringRef CFSTR = __CFStringMakeConstantString(inS.ptr);
}
extern (C) CFStringRef __CFStringMakeConstantString(char* cStr);

But I get the following errors:

src/d/darbon/examples/GrabBag/GrabBag.d:49: Error: non-constant expression
(__CFStringMakeConstantString)("darbon.grabbag.demoview")
../../src/d/macos/corefoundation/CFString.d:152: Error: non-constant expression
(__CFStringMakeConstantString)("darbon.grabbag.demoview")


The first occurs on this line:

	const CFStringRef viewID			=	CFSTR!("darbon.grabbag.demoview");

and the second error is referring to the line inside the template definition.

I'm at a loss. I need to be able to define constants that effectively call
__CFStringMakeConstantString(), and I need to be able to call it directly. Any
suggestions? (GDC 0.27/DMD 1.00).

Thanks!

=?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb algonet.se> writes:

Rick Mann wrote:
 I've run into a problem creating D bindings for the Mac OS X Carbon API. In
particular, I'm trying to find a way to implement the following C macro
(context provided):
 
 typedef const struct __CFString * CFStringRef;
 #define CFSTR(cStr)  __CFStringMakeConstantString("" cStr "")
 CFStringRef  __CFStringMakeConstantString(const char *cStr);	
 #define kSomeCFStringConstant      CFSTR("myCFStringConstantValue");


I used this:
struct __CFString { }
typedef __CFString* CFStringRef;
typedef __CFString* CFMutableStringRef;

extern (C) CFStringRef __CFStringMakeConstantString(char *cStr);
alias __CFStringMakeConstantString CFSTR; // only for string literals


Generally speaking C macros map into D functions, but for simple
renames one can make use of "alias" to avoid the extra object code.

It only works for ASCII strings, by the way, for regular D strings
you need to specify using the UTF-8 encoding to Core Foundation...

--anders

Lionello Lunesu <lio lunesu.remove.com> writes:

Rick Mann wrote:
 I've run into a problem creating D bindings for the Mac OS X Carbon API. In
particular, I'm trying to find a way to implement the following C macro
(context provided):
 
 typedef const struct __CFString * CFStringRef;
 #define CFSTR(cStr)  __CFStringMakeConstantString("" cStr "")
 CFStringRef  __CFStringMakeConstantString(const char *cStr);	
 #define kSomeCFStringConstant      CFSTR("myCFStringConstantValue");
 
 I tried doing this:
 
 struct __CFString {};
 typedef const __CFString* CFStringRef;
 template CFSTR(char[] inS)
 {
 	const CFStringRef CFSTR = __CFStringMakeConstantString(inS.ptr);
 }
 extern (C) CFStringRef __CFStringMakeConstantString(char* cStr);
 
 But I get the following errors:
 
 src/d/darbon/examples/GrabBag/GrabBag.d:49: Error: non-constant expression
(__CFStringMakeConstantString)("darbon.grabbag.demoview")
 ../../src/d/macos/corefoundation/CFString.d:152: Error: non-constant
expression (__CFStringMakeConstantString)("darbon.grabbag.demoview")
 
 
 The first occurs on this line:
 
 	const CFStringRef viewID			=	CFSTR!("darbon.grabbag.demoview");
 
 and the second error is referring to the line inside the template definition.
 
 I'm at a loss. I need to be able to define constants that effectively call
__CFStringMakeConstantString(), and I need to be able to call it directly. Any
suggestions? (GDC 0.27/DMD 1.00).
 
 Thanks!
 


Try dropping the const from the typedef.

L.