将未签名的char *转换为std :: istream * C ++

Question

我必须将二进制数据（无符号char *）传递给以std :: istream为参数的PerformRequest函数。 哪个最好

unsigned char* data // has the binary data

PerformRequest(std::istream* in)
{
    //some implementation
}

Answer 1

您可以使用<sstream>的std::stringstream ，它同时支持istream和ostream接口。 因此，您可以通过ostream -interface写入数据，然后将其作为istream -argument传递：

#include <sstream>
#include <iomanip>
#include <iostream>

void prints(istream &is) {
    unsigned char c;
    while (is >> c) {
        std::cout << "0x" << std::hex << (unsigned int)c << std::endl;
    }
}

int main()
{
    unsigned char x[6] = { 0x2, 0x10, 0xff, 0x0, 0x5, 0x8 };
    std::stringstream xReadWrite;
    xReadWrite.write((const char*)x, 6);
    prints(xReadWrite);
}