Why does message box in C++ show chinese message [duplicate]

Answer 1

You are expecting a cast of a pointer from one type to another to change the value pointed to. That's not what C++ casts do. They just tell the compiler to assume the pointer points to the new type. To specify a wide literal, use L before the quotes (or new string literals if your compiler supports them). And get rid of the cast, it's just obscuring the bug.

Answer 2

You forgot to place 'L' before the string literal. Modify as follows:

int nResult=MessageBox(NULL,
                   L"An example of Cancel,Retry,Continue",
                   L"Message Box!",
                   MB_ICONWARNING|MB_ABORTRETRYIGNORE);

In C++ unicode string literals are prefixed with L. If you don't put the prefix, casting to 'unicode string constant' won't help and causes incorrect interpreting of the memory location.

Answer 3

As David said you've casted an ASCII string to a UNICODE string. Use the _TEXT("Your string") macro instead.

You can't just interpret ASCII bytes as a UNICODE string or bad things will happen.

Edit: Also if you want ASCII strings you can explicitly call MessageBoxA() or change to multi byte character settings in your project settings.