C ++：将读取的二进制文件存储到缓冲区中 [英] C++: Store read binary file into buffer

问题描述

我试图读取二进制文件并将其存储在缓冲区中。问题是，在二进制文件中有多个以null结尾的字符，但它们不在结尾，而是在其他二进制文本之前，所以如果我将文本存储在'\0'后，它只是删除它

I'am trying to read a binary file and store it in a buffer. The problem is, that in the binary file are multiple null-terminated characters, but they are not at the end, instead they are before other binary text, so if I store the text after the '\0' it just deletes it in the buffer.

示例：

char * a = "this is a\0 test";
cout << a;

这将只输出：这是一个

这里是我真正的代码：

此函数读取一个字符

bool CStream::Read  (int * _OutChar)
{
    if (!bInitialized)
        return false;

    int iReturn = 0;

     *_OutChar = fgetc (pFile);

    if (*_OutChar == EOF)
        return false;

    return true;
}

这是我如何使用它：

    char * SendData = new char[4096 + 1];

    for (i = 0; i < 4096; i++)
    {
        if (Stream.Read (&iChar))
            SendData[i] = iChar;
        else
            break;
    }

推荐答案

有一个标准的方式从二进制文件读取到缓冲区。

I just want to mention that there is a standard way to read from a binary file into a buffer.

使用< cstdio> ：

char buffer[BUFFERSIZE];

FILE * filp = fopen("filename.bin", "rb"); 
int bytes_read = fread(buffer, sizeof(char), BUFFERSIZE, filp);

使用< fstream> ：

Using <fstream>:

std::ifstream fin("filename.bin", ios::in | ios::binary );
fin.read(buffer, BUFFERSIZE);

之后用缓冲区做的事情当然取决于你。

What you do with the buffer afterwards is all up to you of course.

编辑：使用< cstdio>
$ b

Full example using <cstdio>

#include <cstdio>

const int BUFFERSIZE = 4096;    

int main() {
    const char * fname = "filename.bin";
    FILE* filp = fopen(fname, "rb" );
    if (!filp) { printf("Error: could not open file %s\n", fname); return -1; }

    char * buffer = new char[BUFFERSIZE];
    while ( (int bytes = fread(buffer, sizeof(char), BUFFERSIZE, filp)) > 0 ) {
        // Do something with the bytes, first elements of buffer.
        // For example, reversing the data and forget about it afterwards!
        for (char *beg = buffer, *end=buffer + bytes; beg < end; beg++, end-- ) {
           swap(*beg, *end);
        }
    }

    // Done and close.
    fclose(filp);

    return 0;
}

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