CODEWITHSUNDEEP
c++winapiunicode
Gogeta70
Gogeta70

Reputation: 901

Strange input from WM_CHAR - WinAPI

This is a continuation of my previous question: WinAPI: How to process keyboard input in custom edit control I felt i should put this in a different question as the nature of the question is a bit different.

So my program is receiving input now, but the input is a bit off. The best way to explain is to just show you the code and the result...

Here's the code that handles WM_CHAR:

    case WM_CHAR:
    {
        TCHAR inc;
        inc = MapVirtualKey(wParam, 2);

        for(short i = 0; i < sizeof(TCHAR); i++)
        {
            unsigned char* x = reinterpret_cast<unsigned char*>(&inc);
            printf("0x%.2X ", x[i]);
        }

        //InvalidateRect(t_hwnd, NULL, 0); // Repaint the window...

    }
    break;

The program is compiled as unicode so all function calls default to their unicode variants.

Here's the result of typing "asdf":

0x31 0x00 0x00 0x00 0x34 0x00 0x36 0x00
TCHAR is 2 bytes in size, so this comes out to "1\046"

Anyone know what the deal is here?

Upvotes: 0

Views: 1461

Answers (1)

c-smile
c-smile

Reputation: 27460

MapVirtualKey accepts scan code for a key. But wParam in WM_CHAR is not a scan code - it is a char. You should use WM_KEYDOWN, wParam there is a scan code.

Links for you:

http://msdn.microsoft.com/en-us/library/ms646280(v=vs.85).aspx

http://msdn.microsoft.com/en-us/library/ms646276(v=vs.85).aspx

Upvotes: 1

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