c++ - main() 中的函数在前一个函数完成之前执行(c++ Xcode)

Question

正如标题所说，我遇到了函数在函数完成之前执行的问题。这是一个问题，因为它打乱了我的程序流程。我的 main() 函数如下所示:

int main()
{
    FilePath1();
    FilePath2();

    VideoConfig1();
    VideoConfig2();

    VideoRecord();

    return 0;
}

FilePath 函数如下所示:

void FilePath1()
{
    cout << "Please enter the full filepath for where you want to save the first video: ";
    cin >> filepath1;
    cin.ignore();

}

问题是 VideoConfig1() 直接在 FilePath1() 之后启动，与 FilePath2() 同时启动。有谁知道为什么会这样？

我试过使用 waitKey() 作为 VideoConfig1() 的初始化，但没有效果。

编辑:

程序应该按如下方式工作:

• Run FilePath1()
  • get the user to enter the filepath for video1 to be saved
• Run Filepath2()
  • get the user to enter the filepath for video2 to be saved
• Run VideoConfig1()
• Run VideoConfig2()
• Run VideoRecord()

两个 FilePath 程序在终端中运行，而其他程序则打开各自的视频窗口。该程序目前正在做的是:

• Run FilePath1()
  • get the user to enter the filepath for video1 to be saved
• Run Filepath2() AND VideoConfig1()
  • get the user to enter the filepath for video2 to be saved
  • if FilePath2 hasn't been completed by the time VideoConfig1 has, crash entire program
• Run VideoConfig2()
• Run VideoRecord()

Answer 1

既然你说你正在输入带空格的文件路径，这就是我认为正在发生的事情:

FilePath1();
FilePath2();
...

void FilePath1()
{
    cout << "Please enter the full filepath for where you want to save the first video: ";
    cin >> filepath1;

    // user enters the following sans quotes: "c:\my files\file.ext"
    // filepath1 becomes "c:\my"

    cin.ignore();
    // cin.ignore() with no params will clear ONE character from the stream
    // the space is removed from the input stream

}

void FilePath2()
{
    cout << "Please enter the full filepath for where you want to save the first video: ";
    cin >> filepath2;

    // at this point, there is still data in the input buffer, 
    // so filepath2 becomes: "files\file.ext" and execution continues 
    // without waiting on user input

    cin.ignore();
    // the return is removed from the input stream, input stream is now empty

}

正如您所建议的，您希望使用 getline，因为您希望输入中有空格。这是清除 cin 与 getline 的一个很好的引用:http://www.cplusplus.com/doc/tutorial/basic_io/