Supporting-and-Using-Extra-Input-Messages.md

@@ -208,7 +208,7 @@ the extra input messages. The steps are as follow:
 1. Change MiniGUI run-time configuration to specify the key `system.ial_engine`
    to be `custom`.
 
-```C
+```cpp
 BOOL InitCustomInput (INPUT* input, const char* mdev, const char* mtype);
 void TermCustomInput (void);
 ```
@@ -216,7 +216,7 @@ void TermCustomInput (void);
 In `InitCustomInput` function, you should fill the operators (the callbacks)
 of `input` argument, the pointer to a INPUT structure:
 
-```C
+```cpp
 typedef struct tagINPUT {
     char*   id;
 
@@ -258,7 +258,7 @@ you should:
 
 1. Fill the fields of `extra` structure, e.g.:
 
-```C
+```cpp
     extra->event = IAL_EVENT_AXIS;
     extra->wparam = MAKELONG(AXIS_SCROLL_VERTICAL, AXIS_SOURCE_WHEEL);
     extra->wparam = MAKELONG(AXIS_SCROLL_HORIZONTAL, AXIS_SOURCE_WHEEL);
@@ -267,7 +267,7 @@ you should:
 
 1. Make sure the return value of this operator have the bit of `IAL_EVENT_EXTRA` set:
 
-```C
+```cpp
     retval |= IAL_EVENT_EXTRA;
 ```