c++图片与base64互转

c++图片与base64互转 代码直观可用，已经测试，可直接调用，需要用到OpenCV读取图片

 属性            大小     日期    时间   名称
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     文件       6148  2019-01-05 19:11  base64_openCV\base64_OpenCV\.DS_Store

     文件          6  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\.name

     文件         97  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\base64_OpenCV.iml

     文件       1775  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\codestyles\Project.xml

     文件         90  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\dictionaries\chendanpeng.xml

     文件        240  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\misc.xml

     文件        278  2019-01-05 19:00  base64_openCV\base64_OpenCV\.idea\modules.xml

     文件      12527  2019-01-05 19:11  base64_openCV\base64_OpenCV\.idea\workspace.xml

     文件     240243  2019-01-05 18:49  base64_openCV\base64_OpenCV\1.jpg

     文件        702  2019-01-05 19:11  base64_openCV\base64_OpenCV\CMakeLists.txt

     文件       6148  2019-01-05 18:53  base64_openCV\base64_OpenCV\src\.DS_Store

     文件       3411  2019-01-05 19:10  base64_openCV\base64_OpenCV\src\base64.h

     文件        713  2019-01-09 09:21  base64_openCV\base64_OpenCV\src\TestFactor.cc

     文件        120  2019-01-05 19:11  base64_openCV\__MACOSX\base64_OpenCV\._.DS_Store

     文件        731  2019-01-05 18:49  base64_openCV\__MACOSX\base64_OpenCV\._1.jpg

     文件        120  2019-01-05 18:53  base64_openCV\__MACOSX\base64_OpenCV\src\._.DS_Store

     目录          0  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\codestyles

     目录          0  2019-01-05 19:01  base64_openCV\base64_OpenCV\.idea\dictionaries

     目录          0  2019-01-05 19:11  base64_openCV\__MACOSX\base64_OpenCV\src

     目录          0  2019-01-05 19:11  base64_openCV\base64_OpenCV\.idea

     目录          0  2019-01-05 19:11  base64_openCV\base64_OpenCV\src

     目录          0  2019-01-05 19:11  base64_openCV\__MACOSX\base64_OpenCV

     目录          0  2019-01-05 19:11  base64_openCV\base64_OpenCV

     目录          0  2019-01-05 19:11  base64_openCV\__MACOSX

     目录          0  2019-01-06 15:49  base64_openCV

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