Golang + cgo-AppDelegate实施无法正常工作

问题描述

我想编写一个可以在MacOS上打开自定义文件类型（.slc）的应用程序。我创建了一个空白的xcode项目来获取所有必需的代码，并通过cgo将其实现到我的应用中。当我双击文件时，应用程序打开，但抱怨它无法打开以下格式的文件：

这是我的Info.plist：

实现如下：

/surge/appDelegate_darwin.go

package surge

//#cgo CFLAGS: -x objective-c
//#cgo LDFLAGS: -framework Cocoa
//#include "appDelegate_darwin.h"
import "C"

/surge/appDelegate_darwin.h

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate>


@end

/surge/appDelegate_darwin.m

#include "appDelegate_darwin.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

-(BOOL)application:(NSApplication *)sender openFile:(NSString *)filename
{
   NSLog(@"%@",filename);
   YES;
}
 
-(void)application:(NSApplication *)sender openFiles:(NSArray *)filenames
{
   NSLog(@"%@",filenames);
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application
}

- (void)applicationWillTerminate:(NSNotification *)aNotification {
    // Insert code here to tear down your application
}

@end

其他信息：我使用Wails框架（https://wails.app）向应用程序添加了一个不错的vue.js前端，并使用了内置的wails build命令。

cgo和Objective-c中的其他实现（例如自定义协议处理程序）可以正常工作。

解决方法

经过一夜无眠后，我通过研究和学习常规Mac应用程序的结构找到了自己的解决方案。

除了实现AppDelegate，还必须实现Document和一些附加功能以使其运行。这是我的

/surge/appDelegate_darwin.h

#import <Cocoa/Cocoa.h>

extern void HandleFile(char *);

@interface AppDelegate : NSObject <NSApplicationDelegate>

@end

@interface Document : NSDocument

@end

/surge/appDelegate_darwin.m

#include "appDelegate_darwin.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

-(BOOL)application:(NSApplication *)sender openFile:(NSString *)filename
{
   YES;
}
 
-(void)application:(NSApplication *)sender openFiles:(NSArray *)filenames
{
   NSLog(@"%@",filenames);
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application
}


- (void)applicationWillTerminate:(NSNotification *)aNotification {
    // Insert code here to tear down your application
}


@end

@interface Document ()

@end

@implementation Document

- (instancetype)init {
    self = [super init];
    if (self) {
        // Add your subclass-specific initialization here.
    }
    return self;
}

+ (BOOL)autosavesInPlace {
    return YES;
}


- (NSString *)windowNibName {
    // Override returning the nib file name of the document
    // If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers,you should remove this method and override -makeWindowControllers instead.
    return @"Document";
}


- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
    // Insert code here to write your document to data of the specified type. If outError != NULL,ensure that you create and set an appropriate error if you return nil.
    // Alternatively,you could remove this method and override -fileWrapperOfType:error:,-writeToURL:ofType:error:,or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.
    [NSException raise:@"UnimplementedMethod" format:@"%@ is unimplemented",NSStringFromSelector(_cmd)];
    return nil;
}


- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError {
    NSData *dataFromFile = [data retain];
    NSString *myString = [[NSString alloc] initWithData:dataFromFile encoding:NSUTF8StringEncoding];

    // This is the place where the magic happens. In my case I just call the HandleFile-function to process the file contents in my main go app
    NSLog(@"Data received: %@",myString);
    HandleFile([myString UTF8String]);
    return YES;
}


@end

我希望有人觉得这有用！