如何在Swift中使用`syslog` [英] How can I use `syslog` in Swift

问题描述

看起来像syslog()函数在Swift 2中不可用.

Looks like syslog() function is not available in Swift 2.

如何在OS X上向syslog发送消息?

How can I send a message to syslog on OS X?

推荐答案

问题是

void syslog(int priority, const char *message, ...);

具有可变参数列表，并且不会导入到Swift中.你可以 使用

takes a variable argument list and is not imported to Swift. You can use

void vsyslog(int priority, const char *message, va_list args);

相反，在Swift中定义包装函数:

instead and define a wrapper function in Swift:

func syslog(priority : Int32, _ message : String, _ args : CVarArgType...) {
    withVaList(args) { vsyslog(priority, message, $0) }
}

syslog(LOG_ERR, "i=%ld, x=%f", 123, 34.56)

请注意，字符串参数必须作为C字符串传递:

Note that string arguments have to be passed as C strings:

syslog(LOG_ERR, "status=%s", "OK".cStringUsingEncoding(NSUTF8StringEncoding))

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或者，使用NSLog()也会写入系统日志:

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Alternatively, use NSLog() which writes to the system log as well:

NSLog("i=%ld, x=%f, status=%@", 123, 34.56, "OK")

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还请注意，在OS X上，syslog()只是对 .你可以打电话 asl_XXX直接起作用，您只需#include <asl.h> 在桥接头文件中.如上所述，asl_log()不是 导入到Swift中，您必须调用asl_vlog().

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Note also that on OS X, syslog() is just a wrapper to the "Apple System Logger facility". You can call the asl_XXX functions directly, you only have to #include <asl.h> in the bridging header file. As above, asl_log() is not imported to Swift and you have to call asl_vlog() instead.

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