C ++使用内存中的ifstream [英] c++ use ifstream from memory

问题描述

我有一些代码使用ifstream从文件中读取一些数据，一切正常.

I have some code that uses ifstream to read some data from a file and everything works.

现在我希望不修改某些代码，而是从内存中读取此数据，实际上我有一个包含数据的char * ...

Now I wish, without modifying some code, read this data from a memory, actually I have a char * that contains the data...

如何在不有效读取文件的情况下将char *数据放入ifstream?

How can I put my char * data into a ifstream without reading effectively the file?

推荐答案

如果可以稍微更改使用ifstream&的代码以使用istream&，则可以轻松地在ifstream和 istringstream (用于从内存中读取数据):

If the code that uses the ifstream& could be changed slightly to use an istream& then you could easily switch between ifstream and istringstream (for reading data from memory):

void read_data(std::istream& in)
{
}

来电者:

std::istringstream in_stream(std::string("hello"));
read_data(in_stream);

std::ifstream in_file("file.txt");
read_data(in_file);

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