copydata.cpp

Windows核心编程配套书的源代码请参考原书一起看

/******************************************************************************
Module:  CopyData.cpp
Notices: Copyright (c) 2000 Jeffrey Richter
******************************************************************************/


#include "..\CmnHdr.h"     /* See Appendix A. */
#include <windowsx.h>
#include <tchar.h>
#include <malloc.h>
#include "Resource.h"


///////////////////////////////////////////////////////////////////////////////


// WindowsX.h doesn't have a prototype for Cls_OnCopyData, so here it is
/* BOOL Cls_OnCopyData(HWND hwnd, HWND hwndFrom, PCOPYDATASTRUCT pcds) */


///////////////////////////////////////////////////////////////////////////////


BOOL Dlg_OnCopyData(HWND hwnd, HWND hwndFrom, PCOPYDATASTRUCT cds) {
   
   Edit_SetText(GetDlgItem(hwnd, cds->dwData ? IDC_DATA2 : IDC_DATA1), 
      (PTSTR) cds->lpData);

   return(TRUE);
}


///////////////////////////////////////////////////////////////////////////////


BOOL Dlg_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam) {

   chSETDLGICONS(hwnd, IDI_COPYDATA);

   // Initialize the edit controls with some test data.
   Edit_SetText(GetDlgItem(hwnd, IDC_DATA1), TEXT("Some test data"));
   Edit_SetText(GetDlgItem(hwnd, IDC_DATA2), TEXT("Some more test data"));
   return(TRUE);
}


///////////////////////////////////////////////////////////////////////////////


void Dlg_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify) {

   switch (id) {
      case IDCANCEL:
         EndDialog(hwnd, id);
         break;

      case IDC_COPYDATA1:
      case IDC_COPYDATA2:
         if (codeNotify != BN_CLICKED)
            break;

         HWND hwndEdit = GetDlgItem(hwnd, 
            (id == IDC_COPYDATA1) ? IDC_DATA1 : IDC_DATA2);

         // Prepare the COPYDATASTRUCT.
         COPYDATASTRUCT cds;

         // Indicate which data field we're sending (0=ID_DATA1, 1=ID_DATA2)
         cds.dwData = (DWORD) ((id == IDC_COPYDATA1) ? 0 : 1);

         // Get the length (in bytes) of the data block we're sending.
         cds.cbData = (Edit_GetTextLength(hwndEdit) + 1) * sizeof(TCHAR);

         // Allocate a block of memory to hold the string.
         cds.lpData = _alloca(cds.cbData);

         // Put the edit control's string in the data block.
         Edit_GetText(hwndEdit, (PTSTR) cds.lpData, cds.cbData);

         // Get the caption of our window.
         TCHAR szCaption[100];
         GetWindowText(hwnd, szCaption, chDIMOF(szCaption));

         // Enumerate through all the top-level windows with the same caption
         HWND hwndT = NULL;
         do {
            hwndT = FindWindowEx(NULL, hwndT, NULL, szCaption);
            if (hwndT != NULL) {
               FORWARD_WM_COPYDATA(hwndT, hwnd, &cds, SendMessage);
            }
         } while (hwndT != NULL);
         break;
   }
}


///////////////////////////////////////////////////////////////////////////////


INT_PTR WINAPI Dlg_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
   
   switch (uMsg) {
      chHANDLE_DLGMSG(hwnd, WM_INITDIALOG, Dlg_OnInitDialog);
      chHANDLE_DLGMSG(hwnd, WM_COMMAND,    Dlg_OnCommand);
      chHANDLE_DLGMSG(hwnd, WM_COPYDATA,   Dlg_OnCopyData);
   }
   return(FALSE);
}


///////////////////////////////////////////////////////////////////////////////


int WINAPI _tWinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

   DialogBox(hinstExe, MAKEINTRESOURCE(IDD_COPYDATA), NULL, Dlg_Proc);
   return(0);
}


//////////////////////////////// End of File //////////////////////////////////