写入文件而不覆盖内容. [英] writing a file without overwriting the contents.

问题描述

用于在不覆盖已写入内容的情况下写入文件的代码.以下面的代码为例:

What code is used to write a file without overwriting the already written content. Taking an example the following code:

using namespace System;
using namespace System::IO;

int main()
{
    //creating the file object data.txt
    FileStream^ fs = gcnew FileStream("data.txt", FileMode::Create);
    StreamWriter^ sw = gcnew StreamWriter(fileName);
    try
    {
        //writing lines from a string and a textbox input
        sw->WriteLine("First Name: "+ this->FnameTextBox->Text);
    }
    //Exception handler
    catch (Exception^)
    {
        Console::WriteLine("data could not be written!");
        fs->Close();
        return -1;
    }
    fs->Close();
    return 0;
}

上面的代码将覆盖文件data.txt的内容.
我应该添加什么代码才能从文本文件的下一行开始写新内容?

预先感谢您提供的任何帮助.

The above code overwrites the content of the file data.txt.
What code should I add in order to write new content starting from the next line of the text file?

Thanx in advance for any help that you''ll give me.

推荐答案

正确组合FileModes应该可以解决问题.在此处阅读有关信息: http://msdn.microsoft. com/de-de/library/system.io.filemode(v = VS.80).aspx [

A proper combination of FileModes should do the trick. Read about it here: http://msdn.microsoft.com/de-de/library/system.io.filemode(v=VS.80).aspx[^]

using namespace System;
using namespace System::IO;

int main()
{
    // Writing the file object data.txt
    // FileMode::Append only in combination with FileMod::Write
    FileStream^ fs = gcnew FileStream("data.txt", FileMode::Write | FileMode::Append);
    StreamWriter^ sw = gcnew StreamWriter(fileName);
    try
    {
        //writing lines from a string and a textbox input
        sw->WriteLine("First Name: "+ this->FnameTextBox->Text);
    }
    //Exception handler
    catch (Exception^)
    {
        Console::WriteLine("data could not be written!");
        fs->Close();
        return -1;
    }
    fs->Close();
    return 0;
}

最好的问候，

-MRB

Best Regards,

-MRB

更改

FileStream^ fs = gcnew FileStream("data.txt", FileMode::Create);

到

to

FileStream^ fs = gcnew FileStream("data.txt", FileMode::Append | FileMode::Write);

换句话说，以附加模式打开文件将使您可以在文件末尾写入文件.

In other words, open your file in append mode will allow you to write it at end of file.

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