1 C++跨平台在Windows、Linux系统上获取当前可执行程序路径

跨平台获取当前可执行程序路径是C++跨平台项目中会经常使用的功能，我将这个功能简单的封装成了一个PathUtils工具类，在该类中通过GetCurrentProgramDirectory静态函数获取当前可执行程序路径，下面贴出了功能实现代码。

path_utils.h

#ifndef _PATH_UTILS_H_
#define _PATH_UTILS_H_

#include <string>

class PathUtils
{
    
    
public:
	// 得到当前程序执行路径
	static std::string GetCurrentProgramDirectory();
};

#endif // !_PATH_UTILS_H_

path_utils.cpp

#include "path_utils.h"

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)

#include<Windows.h>

#elif defined(linux) || defined(__linux)

#include <string.h>
#include <unistd.h>
#include <dlfcn.h>

#endif // WINDOWS

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
static HMODULE GetSelfModuleHandle()
{
    
    
	MEMORY_BASIC_INFORMATION mbi;
	return (
		(::VirtualQuery(GetSelfModuleHandle, &mbi, sizeof(mbi)) != 0)
		? (HMODULE)mbi.AllocationBase : NULL
		);
}

std::string PathUtils::GetCurrentProgramDirectory()
{
    
    
	std::string strCurrentPath = "";
	char curDirector[260] = {
    
     0 };
	GetModuleFileName(GetSelfModuleHandle(), curDirector, 260);
	strCurrentPath = curDirector;

	size_t nameStart = strCurrentPath.rfind("\\");
	strCurrentPath = strCurrentPath.substr(0, nameStart + 1);
	return strCurrentPath;
}

#elif defined(linux) || defined(__linux)
std::string PathUtils::GetCurrentProgramDirectory()
{
    
    
	std::string strCurrentPath = "";
	char szCurWorkPath[256];
	memset(szCurWorkPath, '\0', 256);
	int nRet = readlink("/proc/self/exe", szCurWorkPath, 256);
	if (nRet > 256 || nRet < 0)
	{
    
    
		return strCurrentPath;
	}

	for (int i = nRet; i > 0; i--)
	{
    
    
		if (szCurWorkPath[i] == '/' || szCurWorkPath[i] == '\\')
		{
    
    
			szCurWorkPath[i] = '\0';
			break;
		}
	}

	strCurrentPath = szCurWorkPath;

	return strCurrentPath;
}
#endif

测试代码

#include <iostream>
#include "path_utils.h"

int main()
{
    
    
	std::cout << "Path : " << PathUtils::GetCurrentProgramDirectory() << std::endl;
	return 0;
}

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