Jednoduché slovo spracovanie s ovládacím prvkom upraviť

V nasledujúcom príklade implementuje veľa funkcií jednoduchý textový procesor vyplnením klientskej oblasti okna ovládaním úprava viacerých riadkov. Systém automaticky vykonáva slovo zábal operácie na túto kontrolu upraviť a tiež spracováva spracovania za Zvislý posúvač (vytvorené zadaním ES_AUTOVSCROLL volanie funkcie CreateWindow ). WM_COMMAND správu spracuje položky ponuky; tieto umožňujú používateľovi vrátiť predchádzajúcu akciu vystrihnúť alebo kopírovať výber do schránky, vloženie textu zo schránky a odstrániť aktuálny výber.

LONG APIENTRY MainWndProc( 
HWND hwnd,                // window handle 
UINT message,             // type of message 
WPARAM wParam,            // additional information 
LPARAM lParam)            // additional information 
{ 
    static HWND hwndEdit; 
 
    CHAR lpszTrouble[] = "When in the Course of human Events " 
                         "it becomes necessary for one People " 
                         "to dissolve the Political Bands which " 
                         "have connected them with another, and " 
                         "to assume among the Powers of the " 
                         "Earth, the separate and equal Station " 
                         "to which the Laws of Nature and of " 
                         "Nature's God entitle them, a decent " 
                         "Respect to the Opinions of Mankind " 
                         "requires that they should declare the " 
                         "causes which impel them to the " 
                         "Separation. "; 
 
    switch (message) 
    { 
        case WM_CREATE: 
            hwndEdit = CreateWindow( 
                "EDIT",     // predefined class 
                NULL,       // no window title 
                WS_CHILD | WS_VISIBLE | WS_VSCROLL | 
                    ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL, 
                0, 0, 0, 0, // set size in WM_SIZE message 
                hwnd,       // parent window 
                (HMENU) ID_EDITCHILD, // edit control ID 
                (HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE), 
                NULL);                // pointer not needed 
 
             // Add text to the window. 
 
             SendMessage(hwndEdit, WM_SETTEXT, 0, 
                (LPARAM) lpszTrouble); 
 
            return 0; 
 
        case WM_COMMAND: 
            switch (wParam) 
            { 
                case IDM_EDUNDO: 

                    // Send WM_UNDO only if there is something 
                    // to be undone. 
 
                    if (SendMessage(hwndEdit, EM_CANUNDO, 0, 0)) 
                        SendMessage(hwndEdit, WM_UNDO, 0, 0); 
                    else 
                    {
                        MessageBox(hwndEdit, 
                            "Nothing to undo.", 
                            "Undo notification", MB_OK); 
                    }
                    break; 
 
                case IDM_EDCUT: 
                    SendMessage(hwndEdit, WM_CUT, 0, 0); 
                    break; 
 
                case IDM_EDCOPY: 
                    SendMessage(hwndEdit, WM_COPY, 0, 0); 
                    break; 
 
                case IDM_EDPASTE: 
                    SendMessage(hwndEdit, WM_PASTE, 0, 0); 
                    break; 
 
                case IDM_EDDEL: 
                    SendMessage(hwndEdit, WM_CLEAR, 0, 0); 
                    break; 
 
                case IDM_PASSWORD: 
                    DialogBox(hinst, // current instance 
                        "PassBox",   // resource to use 
                         hwnd,       // parent handle 
                         (DLGPROC) PassProc); 
                    break; 
 
                case IDM_WRAP: 
                    SendMessage(hwndEdit, 
                        EM_SETWORDBREAKPROC, 
                        (WPARAM) 0, 
                        (LPARAM) (EDITWORDBREAKPROC) WordBreakProc); 
                    SendMessage(hwndEdit, 
                        EM_FMTLINES, 
                        (WPARAM) TRUE, 
                        (LPARAM) 0); 
                    SendMessage(hwndEdit, 
                        EM_SETSEL, 
                        0, -1); // select all text 
                    SendMessage(hwndEdit, WM_CUT, 0, 0); 
                    SendMessage(hwndEdit, WM_PASTE, 0, 0); 
                    break; 
 
                case IDM_ABOUT: 
                    DialogBox(hinst, // current instance 
                        "AboutBox",  // resource to use 
                         hwnd,       // parent handle 
                         (DLGPROC) About); 
                    break; 
 
                default: 
                    return DefWindowProc(hwnd, message, wParam, lParam); 
            } 
            break; 
 
        case WM_SETFOCUS: 
            SetFocus(hwndEdit); 
            return 0; 
 
        case WM_SIZE: 
 
            // Make the edit control the size of the window's 
            // client area. 
 
            MoveWindow(hwndEdit, 
                0, 0,           // starting x- and y-coordinates 
                LOWORD(lParam), // width of client area 
                HIWORD(lParam), // height of client area 
                TRUE);          // repaint window 
            return 0; 
 
        case WM_DESTROY: 
            PostQuitMessage(0); 
            return 0; 
 
        default: 
            return DefWindowProc(hwnd, message, wParam, lParam); 
    } 
    return NULL; 
} 
 

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