Transfer picture from c++ MFC to c# application

[congay2015]

Hi, I am going to write an c++ MFC application with some upload picture functions on it. Once the button upload was clicked, the picture would transfers to a c# web application which was running since the beginning. The c# application would triggers a popup window with the image uploaded from the C++ MFC application. However, I am not so sure about the methodology or technical details to enable the communication between c++ and c# application. In my perspective, a web services is more likely to become a layer between both application to enable a file or data transfer to each other. Is there any other better ideas to cater this issues ? Thanks