iOS   发布时间:2022-05-04  发布网站:大佬教程  code.js-code.com
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概述

我收到一个错误“隐式声明函数”sysctlbyname’在C99中无效“当我使用这个代码。我以前使用它,这很好,所以我不知道发生了什么。 我目前正在开发iOS7设备,并使用最新版本的xcode 5在应用商店 UIDeviceHardware.m @interface UIDeviceHardware : NSObject - (NSString *) platform; - (NSString
我收到一个错误“隐式声明函数”sysctlbyname’在C99中无效“当我使用这个代码我以前使用它,这很好,所以我不知道发生了什么。

我目前正在开发iOS7设备,并使用最新版本的xcode 5在应用商店

UIDeviceHardware.m

@interface UIDeviceHardware : NSObject

- (NSString *) platform;
- (NSString *) platformString;

@end

UIDeviceHardware.m

- (NSString *) platform{
    size_t size;
    sysctlbyname("hw.machine",NULL,&size,0);
    char *machine = malloc(sizE);
    sysctlbyname("hw.machine",machine,0);
    NSString *platform = [NSString StringWithUTF8String:machine];
    free(machinE);
    return platform;
}

- (NSString *) platformString{
    NSString *platform = [self platform];
    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4 (GSM)";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 GSM";
    if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6 GSM+CDMA";
    if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6+ GSM";
    if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6+ Global";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
    if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (GSM)";
    if ([platform isEqualToString:@"iPad4,4"])      return @"iPad Mini ReTina (WiFi)";
    if ([platform isEqualToString:@"iPad4,5"])      return @"iPad Mini ReTina (GSM)";
    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
    return platform;
}

解决方法

也许我的答案是微不足道的,但是你是否包括sys / sysctl.h?

#import< sys / sysctl.h>

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