写入和读取字符串到二进制文件C ++ [英] write and read string to binary file C++

问题描述

Im在将字符串写入二进制文件时出现问题。这是我的代码：

Im having problems writing string into a binary file. This is my code:

ofstream outfile("myfile.txt", ofstream::binary);
std::string text = "Text";
outfile.write((char*) &text, sizeof (string));
outfile.close();

然后，我尝试读它，

char* buffer = (char*) malloc(sizeof(string));
ifstream infile("myfile.txt", ifstream::binary);    
infile.read(buffer, sizeof (prueba));
std::string* elem = (string*) buffer;
cout << *elem;
infile.close();

我只是无法工作。对不起，我只是绝望。谢谢！

I just cant get it to work. I am sorry, I am just desperate. Thank you!

推荐答案

行

outfile.write((char*) &text, sizeof (string));

不正确

sizeof（string）不返回字符串的长度，它返回字符串类型的sizeof字节。

sizeof(string) doesn't return the length of the string, it returns the sizeof the string type in bytes.

不要使用C转换将文本转换为 char * ，可以使用适当的成员函数 text.c_str（）获取char *

also do not cast text to char* using a C cast, you can get hold of the char* by using the appropriate member function text.c_str()

您可以简单地写

outfile << text;

。

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