D言語からObjective-CとCocoaAPIを使いたい

Objective-C 文字列 NSString、C言語文字列、D言語文字列の出力

D言語で Mac の NSString を使用して、OS 情報を表示します。
digitalmars.D - Can't get Objective-C class method to compile.　これは、Foundation.framework で充分です。 2015年の内容でしたので、selector を @selector に修正等を行いました。


(base) hidhok % dmd -L-framework -LCocoa string_out.d
(base) hidhok % ./string_out 
2022-12-26 .... osxversion[..:..] MacOS (NSString) = Version 12.6.1 (Build ...) 
2022-12-26 .... osxversion[..:..] NSString strCopy = Version 12.6.1 (Build ...) 
MacOS(Clang string) = Version 12.6.1 (Build ...) 
MacOS(Dlang string) = Version 12.6.1 (Build ...) 
(base) hidhok %

サンプルコード

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string_out/dub.json 

{
    "authors": ["hidhok"],
    "description": "A D/Objective-C Cocoa application.",
    "name": "string_out",
    "dflags": ["-L-framework", "-LCocoa"],
    "sourceFiles": ["../cocoa/strings"]
}
string_out/source/app.d 

/**
 *      string_out/source/app.d    (osxversion.d)      Version 0.0.2
 *        dmd -L-framework -LCocoa stringOut.d
 *        dmd -L-framework -LFoundation stringOut.d
 */
module string_out.main;
import core.attribute : optional, selector;
import std.conv : to;
import std.stdio : writeln, printf;
import cocoa.strings;

void main() {
    NSString str = NSProcessInfo.processInfo.operatingSystemVersionString();
    NSLog("MacOS (NSString) = %@".toNs, str);
    NSLog("NSString strCopy = %@".toNs, str.strCopy);
    printf("MacOS(Clang string) = %s\n", str.toCs);
    writeln("MacOS(Dlang string) = ", str.toDs);
}

extern (Objective-C)
extern class NSProcessInfo {
    static NSProcessInfo processInfo() @selector("processInfo");
    NSString operatingSystemVersionString() @selector("operatingSystemVersionString");
}
cocoa/strings.d

cocoa/strings.dのコードはこちら