C++ 打开一个二进制文件

Question

我想用 C++ 打开一个二进制文件。但我在 C 中有这个功能:

uint openPacket(const char* filename, unsigned char** buffer) {
    FILE* fp = fopen(filename, "rb");
    if (fp) {
        size_t result;
        fseek(fp, 0, SEEK_END);
        long fsize = ftell(fp);
        rewind(fp);
        *buffer = new unsigned char[fsize];
        result = fread(*buffer, 1, fsize, fp);
        if (result != fsize) {
            printf("Reading error in %s, unable to send packet!\n", filename);
            delete[] * buffer;
            fsize = 0;
        }
        fclose(fp);
        return fsize;
    } else {
        printf("Couldn't open %s for packet reading, unable to send packet!\n", filename);
        return 0;
    }
}

我想制作类似的东西:string OpenPacket(string filename)但不工作:(

Answer 1

可能这是一个可能的包装函数:

std::string openPacket( const std::string& filename )
{
    unsigned char* buff;
    uint size = openPacket( filename.c_str(), &buff );
    if( size )
    {
        std::string s( reinterpret_cast<const char*>(buff), size );
        delete [] buff;
        return s;
    }
    return std::string();
}