c ++ fileIO创建/打开文件不工作 [英] c++ fileIO creating/opening file not working

问题描述

我正在开发一个Windows VC ++ 2008项目，并尝试使用fileIO将东西放在子目录中的日志文件中。我做以下：

I am working on a Windows VC++ 2008 project, and trying to use fileIO to put stuff out in log files in a sub-directory. I am doing the following:

void MessageQueue::LogOut(thingEnum _thing){
    std::ofstream Output;
    Output.open("Output/MainLog.txt", std::ios::app);

    if (Output.is_open()){
        // writing stuff
    }
    Output.close();
}

$ b $ p我知道ios :: app会生成一个文件，它也能够生成文件夹，或者我需要一个不同的命令来生成一个文件夹中的文件存在。当我摆脱子目录中的代码它的工作正常，如果我创建文件夹我可以把子目录代码回来。

I know that the ios::app will generate a file, but isn't it also able to generate folders as well, or do I need a different command to generate a folder for the files to exist in. when I get rid of the sub-directory in the code it works fine, and if I create the folder I can put the sub-directory code back.

注意：我明白，我应该技术上打开文件缓冲区相同的行，我创建的流对象。我没有，因为我打算把.open放到一个case switch（_thing）以访问多个文件，只是改变流。

note: I understand that I should technically open the file buffer the same line that I create the stream object. I did not because I plan to put the .open into a case switch (_thing) to have access to multiple files, and just change the stream.

推荐答案

您可以在调用open之前使用_mkdir函数。

You could use the _mkdir function before you call open.

http://msdn.microsoft.com/en-us/library/2fkk4dzw（v = vs.90）.aspx

#include <direct.h>

void MessageQueue::LogOut(thingEnum _thing){

    if (_mkdir("Output\\") == 0) {
        std::ofstream Output;

        Output.open("Output\\MainLog.txt", std::ios::app);

        if (Output.is_open()){
            // writing stuff
        }
        Output.close();
   }
   else {
        // could not create directory
   }
}

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