Set Text on WM_KEYDOWN

On WM_KEYDOWN I am setting the text of a label like so:

Code:

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case WM_KEYDOWN:
    setText((int)wParam);
    break;

void setText(int x){
        LPTSTR ItemText;
        ItemText = new TCHAR[50];
        GetWindowText(hwndStatic, ItemText, 50);
        char c = (char)x;
        char* a = new char[2];
        a[0] = c;
        a[1] = '\0';
        strcat(ItemText, a);
        SetWindowText(hwndStatic, ItemText);
        delete[] ItemText;
        delete[] a;       
}

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This seems to work well for digits and letters but nothing else.
What is a better way to code this?

Try putting that under "WM_CHAR" message.