Fix 64-bit conversion errors

src/shared/Communication.h

 #ifndef COMMUNICATION_H
 #define COMMUNICATION_H
 
 #include <memory>
 #include <sstream>
 #include <stdexcept>
 #include <stdint.h>
 #include <string>
 #include <vector>
 #include <Windows.h>
@@ skipping 114 matching lines @@
     std::ostringstream buffer;
 
     // Disallow copying
     const OutputBuffer& operator=(const OutputBuffer&);
 
     template<class T>
     OutputBuffer& WriteString(const T& value, ValueType type)
     {
       WriteBinary(type);
 
-      SizeType length = value.size();
+      SizeType length = static_cast<SizeType>(value.size());
       WriteBinary(length);
 
       buffer.write(reinterpret_cast<const char*>(value.c_str()), sizeof(T::value_type) * length);
       if (buffer.fail())
         throw new std::runtime_error("Unexpected error writing to output buffer");
 
       return *this;
     }
 
     template<class T>
@@ skipping 41 matching lines @@
 
     InputBuffer ReadMessage();
     void WriteMessage(OutputBuffer& message);
 
   protected:
     HANDLE pipe;
   };
 }
 
 #endif