将代码从 Linux 移植到 MinGW

发布于 2025-01-02 08:59:19 字数 1016 浏览 0 评论 0原文

我正在编写一个小类，可以在 PC 上创建/删除/重命名/搜索文件和目录。

我成功编写了该类并在 Linux 上运行。

当我尝试在 MinGW 中运行相同的类代码时，出现错误。我可以缩小范围： Linux中的mkdir函数，Cygwin有2个参数（目录名，模式权限）但在 MinGW 中只有一个参数（目录名称）。

我的问题是：a）使代码在两个操作系统上运行的最佳方法是什么。 b) 虽然我从未使用过，但我听说预处理器指令可以像 #ifdefine .....#endif .. 或类似的东西 c) 使用预处理器指令是一种很好的编程实践。据我所知，应尽量少用预处理器指令。

有人可以帮助我吗：

这是我在 Linux 和 Cygwin 上运行的代码：

#include "BioDatabase.h"
#include <dirent.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>


BioDatabase::BioDatabase() {
   string s = getcwd(NULL,0);
   changeDirectory(s,"*");
}

BioDatabase::BioDatabase(string directoryName, string extension)
{
   changeDirectory(directoryName, extension);
}

bool BioDatabase::createDirectory(string st)
{
     if( mkdir(st.c_str(),0755) == -1)
    {
       cerr <<endl<<"BOSERR-BioDatabase, createDirectory: Path or file function not found or Permission denied\n\n";
       return false;
    }
    flag =1;
    return true;
}

原文

I am writing a small class which can create/remove/rename/search for files and directories on the PC.

I successfully wrote the class and run on Linux.

When I was trying to run the same Class Code in MinGW, it was giving an error.
I could narrow down to:
mkdir function in Linux, Cygwin has 2 Arguments (directory name , mode permissions)
but in MinGW has only one argument(directory name).

My query is : a) What is the best way to make the code work on both OSs. b) Though I never used, I heard Preprocessor directives can be put like #ifdefined .....#endif ..or some thing of that sort c) Is using Preprocessor directives a good programming practice. As I learnt, preprocessor directives should be used minimally.

Could some one help me in this:

Here is my Code which works on Linux and Cygwin:

#include "BioDatabase.h"
#include <dirent.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>


BioDatabase::BioDatabase() {
   string s = getcwd(NULL,0);
   changeDirectory(s,"*");
}

BioDatabase::BioDatabase(string directoryName, string extension)
{
   changeDirectory(directoryName, extension);
}

bool BioDatabase::createDirectory(string st)
{
     if( mkdir(st.c_str(),0755) == -1)
    {
       cerr <<endl<<"BOSERR-BioDatabase, createDirectory: Path or file function not found or Permission denied\n\n";
       return false;
    }
    flag =1;
    return true;
}

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总攻大人 2025-01-09 08:59:19

您可以编写类似的代码

 #if _POSIX_C_SOURCE
     if( mkdir(st.c_str()) == -1)
 #else
     if ((mkdir(st.c_str(),0755) == -1)
 #endif

另请参阅 feature_test_macros(7) 手册页。

You could code something like

 #if _POSIX_C_SOURCE
     if( mkdir(st.c_str()) == -1)
 #else
     if ((mkdir(st.c_str(),0755) == -1)
 #endif

See also feature_test_macros(7) man page.

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孤凫 2025-01-09 08:59:19

1）您可以使用预处理器在一个平台上做一件事，而在另一个平台上做不同的事情。 EG：

#ifdef mingw32 
/* windows specific code, like mkdir()... */
#else
/* other platform code, like a different way to call mkdir() */
#endif

2）是的，你完全正确：尽可能限制使用它们。但是您很快就会发现您无法完全避免它们。

3）最好的办法是使用一个脚本来检查
功能而不是在每个操作系统的基础上进行。
通常这涉及编写配置脚本（或
类似），这是一个完全不同的学习曲线。尽管如此，它还是让
您通过检查功能而不是检查功能来移植到新平台
将平台添加到一长串列表中。

1) you can use pre-processors to do one thing on one platform, and something different on another. EG:

#ifdef mingw32 
/* windows specific code, like mkdir()... */
#else
/* other platform code, like a different way to call mkdir() */
#endif

2) Yes, you're absolutely right: limit using them as much as you can. but you'll quickly find out you can't avoid them entirely.

3) The best thing to do is to use a script that checks for
functionality rather than do it on a per-operating system basis.
Typically this involves writing a configure script (or
similar), which is a whole other learning curve. Still, it lets
you port to new platforms by checking for functionality rather than
adding the platform to a long list.

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