C++ 文件路径操作相关函数、获取dll所在的路径

首先，记录一个网址，感觉很有用，大部分的文件路径相关函数，里面都有源代码。

https://msdn.microsoft.com/en-us/library/windows/desktop/bb773746(v=vs.85).aspx 

1、完整路径，去除后缀名   PathRemoveExtensionA

#include <iostream>//cout函数所需
#include "atlstr.h"  //PathRemoveExtensionA函数所需

using namespace std;

void main(void)
{
char buffer_1[] = "C:\\TEST\\sample.txt";
char *lpStr1;
lpStr1 = buffer_1;
cout << "The path with extension is          : " << lpStr1 << endl;
PathRemoveExtensionA(lpStr1);
cout << "\nThe path without extension is       : " << lpStr1 << endl;
system("pause");
}

OUTPUT:
==================
The path with extension is          : C:\TEST\sample.txt
The path without extension is       : C:\TEST\sample

2、完整文件路径，获得目录

#include <iostream>//cout函数所需
#include "atlstr.h"  //PathRemoveFileSpecA函数所需

using namespace std;

void main(void)
{
char buffer_1[] = "C:\\TEST\\sample.txt";
char *lpStr1;
lpStr1 = buffer_1;
cout << "The path with file spec is          : " << lpStr1 << endl;
PathRemoveFileSpecA(lpStr1);
cout << "\nThe path without file spec is       : " << lpStr1 << endl;
//注意如果获得了目录，需要得到另一个文件路径时
string filename = lpStr1;
filename = filename + "\\samle.txt";
system("pause");
}

OUTPUT:
==================
The path with file spec is          : C:\TEST\sample.txt
The path without file spec is       : C:\TEST

3、获取dll所在路径的两种方式

（1）需要dll入口函数的句柄

char szPath[MAX_PATH];
GetModuleFileNameA(dllhandle, szPath, MAX_PATH);//BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved) //dll入口函数

（2）无需dll入口函数的句柄，dll内任意函数都可

EXTERN_C IMAGE_DOS_HEADER __ImageBase;//申明为全局变量
char   DllPath[MAX_PATH] = { 0 };
GetModuleFileNameA((HINSTANCE)&__ImageBase, DllPath, _countof(DllPath));