如何将`std::vector<uchar>`保存到`std::ostream`中? [英] How to save `std::vector<uchar>` into `std::ostream`?

问题描述

我们已经用<​​a href="http://opencv.willowgarage.com/documentation/cpp/reading_and_writing_images_and_video.html" rel="创建并填充了一些std::vector<uchar>noreferrer">openCV imencode 例如.现在我们想将它流式传输到一些 http_lib 中，它可以采用某种 ostream(ostringstream) 例如，或者我们只是想在我们使用 ofstream 调试我们的程序时保存.所以我想知道如何将 std::vector 放入 std::ostream 中?

We have created and filled some std::vector<uchar> with openCV imencode for example. Now we want to stream it for example into some http_lib which can take some sort of ostream (ostringstream) for example, or we just want to save in while we debug our programm with ofstream. So I wonder how to put std::vector<uchar> into std::ostream?

推荐答案

使用 write:

void send_data(std::ostream & o, const std::vector<uchar> & v)
{
  o.write(reinterpret_cast<const char*>(v.data()), v.size());
}

ostream 需要裸 char s，但是通过转换该指针将 uchar 视为那些很好.在较旧的编译器上，您可能不得不说 &v[0] 而不是 v.data().

The ostream expects naked chars, but it's fine to treat uchars as those by casting that pointer. On older compilers you may have to say &v[0] instead of v.data().

如果您喜欢一些错误检查，您可以将 write() 的结果作为另一个 std::ostream& 或作为 bool 返回设施.

You can return the result of write() as another std::ostream& or as a bool if you like some error checking facilities.

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