检查文件是否在C ++中存在 [英] Check if file exists in C++

问题描述

我对C ++非常陌生. 在我当前的项目中，我已经包含了

I'm very very new to C++. In my current project I already included

#include <iostream>
#include <Windows.h>
#include <TlHelp32.h>

，我只需要在main()的开头进行快速检查，以查看程序目录中是否存在必需的dll. 那么对我来说最好的方法是什么?

and I just need to do a quick check in the very beginning of my main() to see if a required dll exists in the directory of my program. So what would be the best way for me to do that?

推荐答案

因此，假设可以在同一目录中简单地检查名称正确的文件是否存在，就可以了:

So, assuming it's OK to simply check that the file with the right name EXISTS in the same directory:

#include <fstream>

...

void check_if_dll_exists()
{
    std::ifstream dllfile(".\\myname.dll", std::ios::binary);
    if (!dllfile)
    {
         ... DLL doesn't exist... 
    }
}

如果您想知道它实际上是一个真正的DLL(而不是打开命令提示符并执行type NUL: > myname.dll创建一个空文件的人)，则可以使用:

If you want to know that it's ACTUALLY a real DLL (rather than someone opening a command prompt and doing type NUL: > myname.dll to create an empty file), you can use:

HMODULE dll = LoadLibrary(".\\myname.dll");

if (!dll)
{
   ... dll doesn't exist or isn't a real dll.... 
}
else
{
   FreeLibrary(dll);
}

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