如何在Mac OS X中使用显示ID获取显示名称？

Question

我想知道你是否可以帮我弄清楚如何通过在Mac OS X（10.5）中使用显示ID号来逐步获取显示器的显示名称 ？ 要求是如果我给一个函数显示ID，它将提供显示名称作为回报（反之亦然）。

Display Name看起来像这样：“Color LCD”，“SAMSUNG”

显示ID如下所示：“69671872”，“893830283”

Cocoa中的NSScreen （Obj-C）或Quartz（C）中的CGGetActiveDisplayList允许您获取监视器的显示ID号。 似乎都没有获取显示名称的方法。 不好了！ 以下是获取显示ID的NSScreen代码：

NSArray *screenArray = [NSScreen screens];
NSDictionary *screenDescription = [[screenArray objectAtIndex:0] deviceDescription];
NSLog(@"Device ID: %@", [screenDescription objectForKey:@"NSScreenNumber"]);

System Profiler和“ 系统偏好设置”下的“ 显示 ”参考按“显示名称”显示，而不是“显示ID”。

我问我想要运行AppleScript，它需要显示名称而不是显示ID。 任何帮助深表感谢！ :)

Answer 1

这为您提供了本地化的显示名称：

static void KeyArrayCallback(const void* key, const void* value, void* context) { CFArrayAppendValue(context, key);  }

- (NSString*)localizedDisplayProductName
{
    NSDictionary* screenDictionary = [[NSScreen mainScreen] deviceDescription];
    NSNumber* screenID = [screenDictionary objectForKey:@"NSScreenNumber"];
    CGDirectDisplayID aID = [screenID unsignedIntValue];            
    CFStringRef localName = NULL;
    io_connect_t displayPort = CGDisplayIOServicePort(aID);
    CFDictionaryRef dict = (CFDictionaryRef)IODisplayCreateInfoDictionary(displayPort, 0);
    CFDictionaryRef names = CFDictionaryGetValue(dict, CFSTR(kDisplayProductName));
    if(names)
    {
        CFArrayRef langKeys = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks );
        CFDictionaryApplyFunction(names, KeyArrayCallback, (void*)langKeys);
        CFArrayRef orderLangKeys = CFBundleCopyPreferredLocalizationsFromArray(langKeys);
        CFRelease(langKeys);
        if(orderLangKeys && CFArrayGetCount(orderLangKeys))
        {
            CFStringRef langKey = CFArrayGetValueAtIndex(orderLangKeys, 0);
            localName = CFDictionaryGetValue(names, langKey);
            CFRetain(localName);
        }
        CFRelease(orderLangKeys);
    }
    CFRelease(dict);
    return [(NSString*)localName autorelease];
}

Answer 2

或者，如果您不想使用首选的本地化数组，请将kIODisplayOnlyPreferredName标志传递给IODisplayCreateInfoDictionary()

这是一个较少的CoreFoundation，更多的Cocoa和稍微减少的代码将执行相同的操作：

NSString* screenNameForDisplay(CGDirectDisplayID displayID)
{
    NSString *screenName = nil;

    NSDictionary *deviceInfo = (NSDictionary *)IODisplayCreateInfoDictionary(CGDisplayIOServicePort(displayID), kIODisplayOnlyPreferredName);
    NSDictionary *localizedNames = [deviceInfo objectForKey:[NSString stringWithUTF8String:kDisplayProductName]];

    if ([localizedNames count] > 0) {
        screenName = [[localizedNames objectForKey:[[localizedNames allKeys] objectAtIndex:0]] retain];
    }

    [deviceInfo release];
    return [screenName autorelease];
}

Answer 3

类别rulez =）

NSArray *screens = [NSScreen screens];

for (NSScreen *screen in screens) {
    NSLog([NSString stringWithFormat:@"%@", [screen displayID]]);
    NSLog([NSString stringWithFormat:@"%@", [screen displayName]]);
}  

NSScreen + DisplayInfo.h

#import <Cocoa/Cocoa.h>

@interface NSScreen (DisplayInfo)

-(NSString*) displayName;
-(NSNumber*) displayID;

@end

NSScreen + DisplayInfo.m

#import "NSScreen+DisplayInfo.h"   
#import <IOKit/graphics/IOGraphicsLib.h>

@implementation NSScreen (DisplayInfo)

-(NSString*) displayName
{
    CGDirectDisplayID displayID = [[self displayID] intValue];

    NSString *screenName = nil;

    NSDictionary *deviceInfo = (NSDictionary *)CFBridgingRelease(IODisplayCreateInfoDictionary(CGDisplayIOServicePort(displayID), kIODisplayOnlyPreferredName));
    NSDictionary *localizedNames = [deviceInfo objectForKey:[NSString stringWithUTF8String:kDisplayProductName]];

    if ([localizedNames count] > 0) {
        screenName = [localizedNames objectForKey:[[localizedNames allKeys] objectAtIndex:0]];
    }

    return screenName;
}

-(NSNumber*) displayID
{
    return [[self deviceDescription] valueForKey:@"NSScreenNumber"];
}
@end

Answer 4

这是一个整合的应用程序（http://cl.ly/40Hw）：

/* 
 DisplayID.m
 Author: Robert Harder, rob@iHarder.net
 with help from http://stackoverflow.com/questions/1236498/how-to-get-the-display-name-with-the-display-id-in-mac-os-x

 Returns a list of display names and display IDs.
 Add the flag -v for more information on the screens.

 Compile from the command line:
   cc DisplayID.m -o DisplayID \
     -framework AppKit -framework Foundation -framework IOKit \
     -arch x86_64 -arch i386 -arch ppc7400

 Examples:

   $ DisplayID
   Color LCD : 69675202

   $ DisplayID -v
   Color LCD : 69675202
   {
       NSDeviceBitsPerSample = 8;
       NSDeviceColorSpaceName = NSCalibratedRGBColorSpace;
       NSDeviceIsScreen = YES;
       NSDeviceResolution = "NSSize: {72, 72}";
       NSDeviceSize = "NSSize: {1440, 900}";
       NSScreenNumber = 69675202;
   }
 */

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>
#import <IOKit/graphics/IOGraphicsLib.h>

#define str_eq(s1,s2)  (!strcmp ((s1),(s2)))

NSString* screenNameForDisplay(CGDirectDisplayID displayID )
{
    NSString *screenName = nil;

    NSDictionary *deviceInfo = (NSDictionary *)IODisplayCreateInfoDictionary(CGDisplayIOServicePort(displayID), kIODisplayOnlyPreferredName);
    NSDictionary *localizedNames = [deviceInfo objectForKey:[NSString stringWithUTF8String:kDisplayProductName]];

    if ([localizedNames count] > 0) {
        screenName = [[localizedNames objectForKey:[[localizedNames allKeys] objectAtIndex:0]] retain];
    }

    [deviceInfo release];
    return [screenName autorelease];
}


int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    BOOL verbose = NO;
    BOOL extraVerbose = NO;

    if( argc >= 2 ){
        if( str_eq( "-v",argv[1]) ){
            verbose = YES;
        } else if( str_eq( "-vv", argv[1] ) ){
            verbose = YES;
            extraVerbose = YES;
        } else {
            printf("USAGE: %s [-v[v]]\n", argv[0]);
            printf("Prints a list of names and numeric IDs for attached displays.\n");
            printf("  -v    Verbose mode. Prints more information about each display.\n");
            printf("  -vv   Extra verbose. Prints even more information.\n");
            return argc;
        }
    }

    NSArray *screenArray = [NSScreen screens];
    for( NSScreen *screen in screenArray ){

        NSDictionary *screenDescription = [screen deviceDescription];

        NSNumber *displayID = [screenDescription objectForKey:@"NSScreenNumber"];
        NSString *displayName =screenNameForDisplay([displayID intValue]);


        printf( "%s : %d\n", [displayName UTF8String], [displayID intValue]);       
        if( verbose ){
            printf( "%s\n", [[screenDescription description] UTF8String] );         
        }
        if( extraVerbose ){ 
            NSDictionary *deviceInfo = (NSDictionary *)IODisplayCreateInfoDictionary(CGDisplayIOServicePort([displayID intValue]), kIODisplayOnlyPreferredName);
            printf( "%s\n", [[deviceInfo description] UTF8String] );
        }

    }   // end for:


    [pool drain];
    return 0;
}

Answer 5

我使用Robert Harder的实现在github.com上创建了一个示例项目 。
@ robert-harder感谢您提供的想法！