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curioucity · Oct 29, 2003

Hello

About text 'ripping' (runnin outta idea...).
I have a theory on that, though I'm not entirely sure bout that:
When we choose to cut or copy a text from a page (not a MSWord document), the text is memorized in a part of the RAM. When Paste is hit, the text in RAM is copied to the area of pasting.
Now the question, ignoring the theory:
Suppose we have cut or copied a text. Is there a way to cause the Paste command to display nothing instead of text?
Thanks

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DeeCee · Oct 30, 2003

Suppose we have cut or copied a text. Is there a way to cause the Paste command to display nothing instead of text?
Click to expand...

Not as far as I'm aware although I believe there are some paste buffer managment progs out there.
Knowing why you would want to do this may help.
Why cut/copy in the first place?
Dee Cee

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okinrus · Oct 30, 2003

You can use the winap to mess around with the clipboard if you really wanted to.

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curioucity · Oct 30, 2003

Of course, I cut/copy a text to create multiple of them, or just transfer them to a different location. The problem is, do we always have to shut down our system just to nullify this particular memory containing the text?

okinrus · Oct 30, 2003

You should be able to code it use the functions <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/DataExchange/Clipboard/UsingtheClipboard.asp">here</a> but this depends on alot of different things I think.

daktaklakpak · Nov 7, 2003

Originally posted by curioucity
Is there a way to cause the Paste command to display nothing instead of text?
Click to expand...

If you write a program, you can disable the copy and paste functions. So nothing can copy from your program and nothing will paste onto your program.

curioucity · Nov 8, 2003

Nope, I'm not writing one. I only want to know how to erase the 'paste memory' in Windows applications.

okinrus · Nov 8, 2003

I think then all you need to do is call GetClipboardData(CF_TEXT).
The sequence in used in the winapi example is
<code>
if (!IsClipboardFormatAvailable(CF_TEXT))
return;
if (!OpenClipboard(hwndMain))
return;

hglb = GetClipboardData(CF_TEXT);
if (hglb != NULL)
{
lptstr = GlobalLock(hglb);
if (lptstr != NULL)
{
// Don't need this
// ReplaceSelection(hwndSelected, pbox, lptstr);
GlobalUnlock(hglb);
}
}
CloseClipboard();
</code>
It's worth a try at least. As long as your application keeps retrieving data from the global clipboard, no other application will be able keep its data there.

daktaklakpak · Nov 11, 2003

Originally posted by curioucity
Nope, I'm not writing one. I only want to know how to erase the 'paste memory' in Windows applications.
Click to expand...

If you don't write your own program, you can use clipboard manager to "clear" the "paste memory". Just remember, the OS is not secure and most software aren't too. The so called "clear" feature is just makes the current software forget where the "paste memory" was. The "infomation" could potentially still intact in your computer's memory. And any program that does a full memory scan/dump can reveal them.

okinrus · Nov 12, 2003

I was a bit interested in this so I wrote a short windows program that removes the data. The main change I made to the code that I had written was a call to EmptyClipboard after reading from the clipbaord. To clear the data do file->clear

curioucity · Nov 13, 2003

WOW, that works! You're great! Maybe if I have enough skill I'll try to check you program structure.

okinrus · Nov 13, 2003

Most of it's machine generated. I added a hook into the the winproc that calls clearWindow(hWnd) when the clear menu item is clicked.
<div>
// clip.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "clip.h"
#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
     // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_CLIP, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow)) 
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_CLIP);

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0)) 
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX); 

    wcex.style            = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc      = (WNDPROC)WndProc;
    wcex.cbClsExtra       = 0;
    wcex.cbWndExtra       = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = LoadIcon(hInstance, (LPCTSTR)IDI_CLIP);
    wcex.hCursor          = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName     = (LPCTSTR)IDC_CLIP;
    wcex.lpszClassName    = szWindowClass;
    wcex.hIconSm          = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

    return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

void clearClipboard(HWND hWnd)
{
    HANDLE hglb;
    LPTSTR lptstr;

    if (!IsClipboardFormatAvailable(CF_TEXT)) 
        return; 
    if (!OpenClipboard(hWnd)) 
        return; 

    hglb = GetClipboardData(CF_TEXT); 
    if (hglb != NULL)  { 
        lptstr = (LPTSTR)GlobalLock(hglb); 
        MessageBox(hWnd, lptstr, "Going to delete this data", MB_OK);
        // clear clipboard
        EmptyClipboard();
        GlobalUnlock(hglb); 
    } 

    CloseClipboard(); 
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND    - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY    - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message) 
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam); 
        wmEvent = HIWORD(wParam); 
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        case ID_FILE_CLEAR:
            clearClipboard(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: Add any drawing code here...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INITDIALOG:
        return TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
        {
            EndDialog(hDlg, LOWORD(wParam));
            return TRUE;
        }
        break;
    }
    return FALSE;
}

</div>

curioucity · Nov 13, 2003

*collapses*
*gets up*
to think that I'm bad at C++.........

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