String Manipulation Example

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#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wc;
    MSG msg;

    ZeroMemory(&wc, sizeof(WNDCLASSEX));

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = TEXT("myWindowClass");

    RegisterClassEx(&wc);

    CreateWindowEx(
        WS_EX_CLIENTEDGE,
        TEXT("myWindowClass"),
        TEXT("String Manipulation"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        340,
        320,
        NULL,
        NULL,
        hInstance,
        NULL);

    while(GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}



LRESULT CALLBACK WndProc(HWND hwnd,
                         UINT msg,
                         WPARAM wParam,
                         LPARAM lParam)
{
    PAINTSTRUCT Ps;
    HDC hdc;

    switch(msg)
    {

    case WM_PAINT:
    {
        hdc = BeginPaint(hwnd, &Ps);

        // Original string
        TCHAR OutputText[128] = TEXT("STRING MANIPULATION");

        int stringlength = lstrlen(OutputText);

        TextOut(hdc,
                0,
                0,
                OutputText,
                stringlength);

        // Convert to lower case
        CharLower(OutputText);

        TextOut(hdc,
                0,
                15,
                OutputText,
                stringlength);

        // Move pointer to second character
        LPCTSTR newstring = CharNext(OutputText);

        TextOut(hdc,
                0,
                30,
                newstring,
                stringlength - 1);

        // Skip characters one at a time
        int i;

        for(i = 2; i <= 7; i++)
        {
            newstring = CharNext(newstring);

            TextOut(hdc,
                    0,
                    15 + (15 * i),
                    newstring,
                    stringlength - i);
        }

        // Copy remaining string
        lstrcpy(OutputText, newstring);

        stringlength = lstrlen(OutputText);

        // Convert back to upper case
        CharUpper(OutputText);

        TextOut(hdc,
                0,
                135,
                OutputText,
                stringlength);

        EndPaint(hwnd, &Ps);
    }
    break;


    case WM_CLOSE:

        DestroyWindow(hwnd);

        break;


    case WM_DESTROY:

        PostQuitMessage(0);

        break;


    default:

        return DefWindowProc(hwnd,
                             msg,
                             wParam,
                             lParam);
    }

    return 0;
}