【C++】图片转byte

系统：Ubuntu20.04

c++ 14

IDE： Clion

1 main.cpp 代码如下：

#include 
#include 
#include 
#include "opencv2/opencv.hpp"
 
using namespace std;
 
uint8_t* matToBytes(cv::Mat image)
{
    int size = image.total() * image.elemSize();
    uint8_t* bytes = new uint8_t[size];
    cout << (int)image.at(0, 0)[0] << endl;
    cout << (int)(image.data[0]) << endl;
    std::memcpy(bytes, image.data, size * sizeof(uint8_t));
    return bytes;
}
 
int main() {
    cv::Mat img = cv::imread("/home/test.jpg");
    uint8_t* img_byte = NULL;
    img_byte = matToBytes(img);
    cout << (int)img_byte[0] << endl;
    delete[] img_byte; //使用delete，防止内存泄露
    return 0;
}

2 CMakeLists.txt

cmake_minimum_required(VERSION 3.22)
project(TEst)
 
set(CMAKE_CXX_STANDARD 14)
# 设置OpenCV目录所在
set(OpenCV_DIR "/home/opencv/build")
 
# 搜索OpenCV目录
find_package(OpenCV REQUIRED)
 
# 添加OpenCV头文件目录
include_directories(${OpenCV_INCLUDE_DIRS})
 
add_executable(TEst main.cpp)
 
target_link_libraries( TEst ${OpenCV_LIBS} /home/opencv/build/lib/)
MESSAGE("OpenCV_LIBS: " ${OpenCV_LIBS} )  #display opencv libs found