Question

什么方法可以强制python从NSTask以64模式运行？

更新：根据Ned的建议，我尝试直接使用目标c引用Python2.7并且有效。将@“/ usr / bin / python”更改为@“/ usr / bin / python2.7”。新代码位于问题的最底层。

我有一个64位系统。当从终端python运行时运行64位。当我从运行/ usr / bin / uname -m的NSTask运行一个普通shell时，它返回x86_64。

我尝试使用arch但运行python的shell仍处于32位模式。

示例方法

-(void) runPython64BitScriptViaArchWithPath:(NSString*)path {

    NSTask* task = [[NSTask alloc] init];
    task.launchPath = @"/usr/bin/arch" ;
    task.arguments = [NSArray arrayWithObjects: @"-x86_64", @"/usr/bin/python", path, nil];

    [task setStandardInput:[NSPipe pipe]] ;

    NSPipe *stdOutPipe = nil;
    stdOutPipe = [NSPipe pipe];
    [task setStandardOutput:stdOutPipe];

    NSPipe* stdErrPipe = nil;
    stdErrPipe = [NSPipe pipe];
    [task setStandardError: stdErrPipe];

    NSLog(@"%@", [task arguments]) ;

    [task launch] ;

    NSData* data = [[stdOutPipe fileHandleForReading] readDataToEndOfFile];

    [task waitUntilExit];

    NSInteger exitCode = task.terminationStatus;

    if (exitCode != 0)
    {
        NSLog(@"Error!");
        NSData *error = [[stdErrPipe fileHandleForReading] readDataToEndOfFile] ;
        NSLog(@"Exit code : %ld", (long)exitCode) ;
        NSString *result = [[NSString alloc] initWithBytes: error.bytes length:error.length encoding: NSUTF8StringEncoding] ;
        NSLog(@"%@",result);
        [result release];
    } else {
        NSString *result = [[NSString alloc] initWithBytes: data.bytes length:data.length encoding: NSUTF8StringEncoding] ;
        NSLog(@"%@",result) ;
        [result release];
    }
    [task release] ;

}

从终端

运行的示例python脚本

#!/usr/bin/env python
import os
os.environ['DJANGO_SETTINGS_MODULE'] = 'social_shields.settings'

try:
    import hosts.models
    shield = hosts.models.Shield.objects.all()[0]
    shield.active = True
    shield.save()
except Exception as exception:
    import struct
    print 'Bits : %s' % ( 8 * struct.calcsize("P"))
    print exception

示例日志

2013-07-04 16:10:31.600 socialshield[88688:303] onShieldDown
2013-07-04 16:10:31.607 socialshield[88688:303] x86_64
2013-07-04 16:10:31.607 socialshield[88688:303] (
    "-x86_64",
    "/usr/bin/python",
    "/source/social_shields/social_shields/shield_down.py"
)
2013-07-04 16:10:31.933 socialshield[88688:303] Bits : 32
Error loading MySQLdb module: dlopen(/Library/Python/2.7/site-packages/_mysql.so, 2): no suitable image found.  Did find:
    /Library/Python/2.7/site-packages/_mysql.so: mach-o, but wrong architecture

在应用Ned的建议后适用的新代码： - ）

-(void) runPython64BitScriptViaArchWithPath:(NSString*)path {

    NSTask* task = [[NSTask alloc] init];
    task.launchPath = @"/usr/bin/arch" ;
    task.arguments = [NSArray arrayWithObjects: @"-x86_64", @"/usr/bin/python2.7", path, nil];

    [task setStandardInput:[NSPipe pipe]] ;

    NSPipe *stdOutPipe = nil;
    stdOutPipe = [NSPipe pipe];
    [task setStandardOutput:stdOutPipe];

    NSPipe* stdErrPipe = nil;
    stdErrPipe = [NSPipe pipe];
    [task setStandardError: stdErrPipe];

    NSLog(@"%@", [task arguments]) ;

    [task launch] ;

    NSData* data = [[stdOutPipe fileHandleForReading] readDataToEndOfFile];

    [task waitUntilExit];

    NSInteger exitCode = task.terminationStatus;

    if (exitCode != 0)
    {
        NSLog(@"Error!");
        NSData *error = [[stdErrPipe fileHandleForReading] readDataToEndOfFile] ;
        NSLog(@"Exit code : %ld", (long)exitCode) ;
        NSString *result = [[NSString alloc] initWithBytes: error.bytes length:error.length encoding: NSUTF8StringEncoding] ;
        NSLog(@"%@",result);
        [result release];
    } else {
        NSString *result = [[NSString alloc] initWithBytes: data.bytes length:data.length encoding: NSUTF8StringEncoding] ;
        NSLog(@"%@",result) ;
        [result release];
    }
    [task release] ;

}

Answer 1

我假设您已经验证/Library/Python/2.7/site-packages/_mysql.so是64位，并且您在两种情况下都使用相同的Python。在OS X 10.6及更高版本的系统中，/usr/bin/python实际上是一个包装器可执行文件，用于确定要运行哪个版本的Python以及哪个体系结构（32位或64位）;有关详细信息，请参阅man 1 python。尝试直接执行/usr/bin/python2.7。那应该默认为64位。您还可以使用此documented test：

检查Python是以32位还是64位模式运行

import sys; print(sys.maxsize > 2**32)

强制Python从NSTask子进程以64模式运行

1 个答案: