Text reading and writing fromt/to clipboard

no-reply@allegro.cc (DanielH) — Sun, 21 Dec 2014 12:46:36 +0000

Windows only

I've tested it a few times, but would like for someone else to test it. Also any suggestions.

// header
ALLEGRO_USTR *al_read_from_clipboard();
bool al_write_to_clipboard(ALLEGRO_USTR *str);

#SelectExpand
   1// source
   2#include 
   3#include 
   4
   5ALLEGRO_USTR *al_read_from_clipboard()
   6{
HWND hWnd = 0;
ALLEGRO_USTR *str = 0;
uint16_t *pchData = 0;
HANDLE hClipboardData = 0;
size_t size = 0;
ALLEGRO_DISPLAY *display = 0;
  13
display = al_get_current_display();
  15
if (display != 0)
{
  hWnd = al_get_win_window_handle(display);
  19
  if (hWnd != 0)
  {
    if (OpenClipboard(hWnd))
    {
      if (IsClipboardFormatAvailable(CF_UNICODETEXT) ||
        IsClipboardFormatAvailable(CF_TEXT) ||
        IsClipboardFormatAvailable(CF_OEMTEXT))
      {
        hClipboardData = GetClipboardData(CF_UNICODETEXT);
  29
        if (hClipboardData != 0)
        {
          pchData = (uint16_t*)GlobalLock(hClipboardData);
  33
          if (pchData != 0)
          {
            str = al_ustr_new_from_utf16(pchData);
  37
            GlobalUnlock(hClipboardData);
          }
        }
      }
  42
      CloseClipboard();
    }
  }
}
  47
return str;
  49}
  50
  51bool al_write_to_clipboard(ALLEGRO_USTR *str)
  52{
HWND hWnd = 0;
bool rv = false;
uint16_t *pchData = 0;
HGLOBAL hClipboardData = 0;
size_t size = 0;
int offset = 0;
ALLEGRO_DISPLAY *display = 0;
size_t i = 0;
  61
display = al_get_current_display();
  63
if (display != 0)
{
  hWnd = al_get_win_window_handle(display);
  67
  if (hWnd != 0)
  {
    if (OpenClipboard(hWnd))
    {
      EmptyClipboard();
  73
      if (str != 0)
      {
        size = (al_ustr_length(str) + 1) * sizeof(uint16_t);
  77
        if (size > 1)
        {
          hClipboardData = GlobalAlloc(GMEM_MOVEABLE, size);
  81
          if (hClipboardData != 0)
          {
            pchData = (uint16_t*)GlobalLock(hClipboardData);
  85
            if (pchData != 0)
            {
              if (size == al_ustr_encode_utf16(str, pchData, size))
              {
              }
  91
              GlobalUnlock(hClipboardData);
  93
              if (SetClipboardData(CF_UNICODETEXT, hClipboardData))
              {
                rv = true;
              }
            }
          }
        }
      }
 102
      CloseClipboard();
    }
  }
}
 107
return rv;
 109}

no-reply@allegro.cc (beoran) — Sun, 21 Dec 2014 20:45:06 +0000

Good beginning, but this needs to be made portable. Copy paste under Linux is a bit ... complex as well.

no-reply@allegro.cc (Arthur Kalliokoski) — Sun, 21 Dec 2014 20:48:15 +0000

Edgar Reynaldo was working on this a few years back.

https://www.allegro.cc/forums/thread/606034

no-reply@allegro.cc (Edgar Reynaldo) — Sun, 21 Dec 2014 22:29:06 +0000

Yeah, but mine never supported utf16 on windows. And the linux version was a nightmare but it worked.

Edgar Reynaldo said:

For Linux copy/paste your program needs to respond to SelectionRequest events, something an Allegro program could not do without hacking Allegro to expose the X11 events that it monitors. For these reasons, an external program is the best solution to manage copy/paste on Linux. Since xsel, xclip and others don't manage images, I wrote my own program that does, xcsi. Copying to the clipboard (through xcsi) also works better, because xcsi stays running as long as it is the selection owner, as opposed to closing your program and losing the selection data.

What we need is someone experienced with MacOSX and obj-C to write clipboard code for OSX.