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c++ - 如何使用 swig 将 const 字符串参数从 perl 传递到 c++

转载 作者:行者123 更新时间:2023-12-01 14:20:17 25 4
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我是 Swig 的新手,在调试此错误时需要帮助。

我的动机是使用 Swig、C++、Perl 创建一个耗时更少的日志记录系统。但是我在通过 swig 将字符串参数从 Perl 传递给 C++ 时出错。

我把我的整个代码和错误放在下面。
请帮我解决这个问题。将来谢谢。

Logger.cpp

#include <stdexcept>

#include <string>
#include <ctime>
#include "Logger.h"

using namespace std;
Logger* Logger::pInstance = nullptr;




Logger& Logger::instance()
{
lock_guard<mutex> guard(sMutex);
printf("instance");
if (pInstance == nullptr)
pInstance = new Logger();
return *pInstance;
}

void Logger::Cleanup()
{
lock_guard<mutex> guard(Logger::sMutex);
delete Logger::pInstance;
Logger::pInstance = nullptr;
}


Logger::Logger()
{
printf("Constructor\n");
mOutputStream.open("log.out", ios_base::app);
if (!mOutputStream.good()) {
throw runtime_error("Unable to initialize the Logger!");
}

}
void Logger::log(const string& inMessage, const string& inLogLevel)
{
lock_guard<mutex> guard(sMutex);
logHelper(inMessage, inLogLevel);
}

void Logger::logHelper(const std::string& inMessage, const std::string& inLogLevel)
{
mOutputStream << "[ " << current_time() << " ]" << inLogLevel << ": " << inMessage << endl;
}

string Logger::current_time()
{
time_t rawtime;
struct tm * timeinfo;
char buffer[80];

time (&rawtime);
timeinfo = localtime(&rawtime);

strftime(buffer,sizeof(buffer),"%d-%m-%Y %H:%M:%S",timeinfo);
std::string str(buffer);
return str;
}



Logger::~Logger(){
printf("deconstructor\n");
mOutputStream.close();
}

记录器.h
#ifndef LOGGER_H_
#define LOGGER_H_
#include <stdio.h>

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <mutex>

class Logger
{
public:
Logger();
~Logger();
Logger& instance();
void log(const std::string& inMessage,
const std::string& inLogLevel);
protected:
static Logger* pInstance;
std::ofstream mOutputStream;
void Cleanup();
void logHelper(const std::string& inMessage,
const std::string& inLogLevel);
std::string current_time();
private:


std::mutex sMutex;
};
#endif

Logger.i
%module Logger 
%{
#include "Logger.h"

%}

%include "Logger.h"

ch.pl
use strict;
use warnings;

use Cwd qw( abs_path );
use File::Basename qw( dirname );
use lib dirname(abs_path($0));

use Logger;

my $p=new Logger::Logger();
$p->instance();
$p->log("test message");

错误信息*
TypeError in method 'Logger_log', argument 2 of type 'std::string' at ch1.perl line 19.

最佳答案

您需要包含 std::string 的类型映射。在您的接口(interface)文件中,以便 SWIG 知道如何处理类型,请参阅 chapter 9.4 in the manual :

9.4.1 std::string The std_string.i library provides typemaps for converting C++ std::string objects to and from strings in the target scripting language.


%module Logger 
%include "std_string.i"
%{
#include "Logger.h"
%}
%include "Logger.h"

如果我使用它并运行 ch.pl像这样:
use strict;
use warnings;
use lib '.';
use Logger;
my $p = Logger::Logger->new();
$p->instance();
$p->log("test message", "DEBUG");

我得到输出:
Constructor
instanceConstructor
deconstructor
log.out的内容文件是:
[ 22-05-2020 17:35:12 ]DEBUG: test message

关于c++ - 如何使用 swig 将 const 字符串参数从 perl 传递到 c++,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61957657/

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