Question

我正试图在C中以编程方式获取Mac OS X的版本。在搜索了一段时间之后我尝试了这段代码：

#include <CoreServices/CoreServices.h>

int GetOS()
{
    SInt32 majorVersion,minorVersion,bugFixVersion;

    Gestalt(gestaltSystemVersionMajor, &majorVersion);
    Gestalt(gestaltSystemVersionMinor, &minorVersion);
    Gestalt(gestaltSystemVersionBugFix, &bugFixVersion);

    printf("Running on Mac OS X %d.%d.%d\n",majorVersion,minorVersion,bugFixVersion);    

    return 0;
}

XCode返回LD错误：

Undefined symbols for architecture x86_64: "_Gestalt", referenced from: _GetOS in main.o

我错过了什么？你是怎么做到的？

我也找到了这个片段

[[NSProcessInfo processInfo] operatingSystemVersionString]

但我不知道如何在C中写这个。

Answer 1

您是否已将适当的框架传递给GCC以启用CoreServices？

% gcc -framework CoreServices -o getos main.c

Answer 2

下面的代码应该在可预见的将来用于确定当前版本的Mac Os X.

/*  McUsr put this together, and into public domain, 
    without any guarrantees about anything,
    but the statement that it works for me.
*/

#if 1 == 1
#define TESTING
#endif

#include <sys/param.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct osver {
    int minor;
    int sub;
} ;
typedef struct osver osxver ;
void macosx_ver(char *darwinversion, osxver *osxversion ) ;
char *osversionString(void) ;

#ifdef TESTING
int main( int argc, char *argv[] )
{
    osxver foundver;
    char *osverstr= NULL ;
    osverstr=osversionString() ;
    macosx_ver(osverstr, &foundver ) ;
    printf("Mac os x version = 10.%d.%d\n",foundver.minor,foundver.sub );
    free(osverstr);
    return 0;
}
#endif
char *osversionString(void) {
    int mib[2];
    size_t len;
    char *kernelVersion=NULL;
    mib[0] = CTL_KERN;
    mib[1] = KERN_OSRELEASE;

    if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0 ) {
        fprintf(stderr,"%s: Error during sysctl probe call!\n",__PRETTY_FUNCTION__ );
        fflush(stdout);
        exit(4) ;
    }

    kernelVersion = malloc(len );
    if (kernelVersion == NULL ) {
        fprintf(stderr,"%s: Error during malloc!\n",__PRETTY_FUNCTION__ );
        fflush(stdout);
        exit(4) ;
    }
    if (sysctl(mib, 2, kernelVersion, &len, NULL, 0) < 0 ) {
        fprintf(stderr,"%s: Error during sysctl get verstring call!\n",__PRETTY_FUNCTION__ );
        fflush(stdout);
        exit(4) ;
    }

    return kernelVersion ;
}

void macosx_ver(char *darwinversion, osxver *osxversion ) {
/*
    From the book Mac Os X and IOS Internals:
    In version 10.1.1, Darwin (the core OS) was renumbered from v1.4.1 to 5.1,
    and since then has followed the OS X numbers consistently by being four
    numbers ahead of the minor version, and aligning its own minor with the
    sub-version.
*/
    char firstelm[2]= {0,0},secElm[2]={0,0};

    if (strlen(darwinversion) < 5 ) {
        fprintf(stderr,"%s: %s Can't possibly be a version string. Exiting\n",__PRETTY_FUNCTION__,darwinversion);
        fflush(stdout);
        exit(2);
    }
    char *s=darwinversion,*t=firstelm,*curdot=strchr(darwinversion,'.' );

    while ( s != curdot )
        *t++ = *s++;
    t=secElm ;
    curdot=strchr(++s,'.' );
    while ( s != curdot )
        *t++ = *s++;
    int maj=0, min=0;
    maj= (int)strtol(firstelm, (char **)NULL, 10);
    if ( maj == 0 && errno == EINVAL ) {
        fprintf(stderr,"%s Error during conversion of version string\n",__PRETTY_FUNCTION__);
        fflush(stdout);
        exit(4);
    }

    min=(int)strtol(secElm, (char **)NULL, 10);

    if ( min  == 0 && errno == EINVAL ) {
        fprintf(stderr,"%s: Error during conversion of version string\n",__PRETTY_FUNCTION__);
        fflush(stdout);
        exit(4);
    }
    osxversion->minor=maj-4;
    osxversion->sub=min;
}

Answer 3

这是一个“工作量少”，足够用于家庭项目（静态分配缓冲区，忽略错误）。适用于OS X 10.11.1。

@CachePut

Answer 4

使用@uchuugaka 对@McUsr 的回答的评论中的提示，我编写了一个似乎有效的函数。我并不是说它比任何其他答案都好。

/*
 * Structure for MacOS version number
 */
typedef struct macos_version_str
{
    ushort major;
    ushort minor;
    ushort point;
} macos_type;

/****************************************************************************
 *
 * Determine the MacOS version.
 *
 * Parameters:
 *    version_struct:  (pointer to) macos_version structure to be filled in.
 *
 * Return value:
 *    0: no error.
 *
 ****************************************************************************/

static int get_macos_version ( macos_type *version_struct )
{
    char    os_temp [20] = "";
    char   *os_temp_ptr  = os_temp;
    size_t  os_temp_len  = sizeof(os_temp);
    size_t  os_temp_left = 0;
    int     rslt         = 0;

    
    version_struct->major = 0;
    version_struct->minor = 0;
    version_struct->point = 0;
    
    rslt = sysctlbyname ( "kern.osproductversion", os_temp, &os_temp_len, NULL, 0 );
    if ( rslt != 0 )
    {
        fprintf ( stderr,
                "sysctlbyname() returned %d error (%d): %s",
                rslt, errno, errno, strerror(errno));
        return ( rslt );
    }
    
    os_temp_left = os_temp_len; /* length of string returned */
    int temp = atoi ( os_temp_ptr );
    version_struct->major = temp;
    version_struct->major = atoi ( os_temp_ptr );
    
    while ( os_temp_left > 0 && *os_temp_ptr != '.' )
    {
        os_temp_left--;
        os_temp_ptr++;
    }
    os_temp_left--;
    os_temp_ptr++;
    version_struct->minor = atoi ( os_temp_ptr );
    
    while ( os_temp_left > 0 && *os_temp_ptr != '.' )
    {
        os_temp_left--;
        os_temp_ptr++;
    }
    os_temp_left--;
    os_temp_ptr++;
    version_struct->point = atoi ( os_temp_ptr );
    
    fprintf ( stderr, "Calculated OS Version: %d.%d.%d", version_struct->major, version_struct->minor, version_struct->point );
    
    if ( version_struct->major == 0 ||
         version_struct->minor == 0 ||
         version_struct->point == 0   )
    {
        fprintf ( stderr, "Unable to parse MacOS version string %s", os_temp );
        return ( -2 );
    }
    
    return 0;
}

使用标准C在Mac OS X中获取操作系统版本

4 个答案: