[转]api 编程处理dialogbox的控件消息

API编程，DialogBox中的控件消息处理，如EditBox的WM_CHAR消息，WM_PASTE消息，ComboBox的CBN_SELCHANGE消息和EditBox的EN_CHANGE 消息，示例代码如下：

//1。创建 Dialog
short ShowActivationDlg(HWND hParent)
{
  LRESULT lRet = 0;
  lRet = DialogBox(g_hinstThisDll, MAKEINTRESOURCE(IDD_DIALOG_ACTIVATE), hParent, (DLGPROC)    DlgActivationProc);

  return (short)lRet;
}

//2。Dialog 消息处理函数
LRESULT CALLBACK DlgActivationProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    switch (message)
    {
     case WM_INITDIALOG:   
          return InitActivationDialog(hWnd);

     case WM_COMMAND:
         {
              switch (LOWORD(wParam))
              {
               case IDOK:
                    EndDialog(hWnd, IDOK); 
                    return IDOK;
               case IDCANCEL:    
                    EndDialog(hWnd, IDCANCEL);
                    return IDCANCEL;
               case IDC_CMB_LOCAL:  //ComboBox control
                    if(HIWORD(wParam) == CBN_SELCHANGE)
                   {
                       HWND hComboLocal = GetDlgItem(hWnd, IDC_CMB_LOCAL);
                       int nCurSel = SendMessage(hComboLocal, CB_GETCURSEL, 0, 0);
                   }
                   break;
               case IDC_EDIT_TEXT:  //EditBox control
                   if(HIWORD(wParam) == EN_CHANGE)
                   {
                       HWND hEditEmailWnd = GetDlgItem(hWnd, IDC_EDIT_TEXT);
                       //Add your code here...
                   }
              }
        }

    }
    return 0L;
}

//3。初始化控件处理函数
BOOL InitActivationDialog(HWND hWnd)
{
    //...

    //Set new process function of EditBox
    hChildWnd = GetDlgItem(hWnd, IDC_EDIT_TEXT);
    g_EditProcOrig = (WNDPROC)SetWindowLong(hChildWnd, GWL_WNDPROC, (LONG)EditProcNew);
}

//4。控件处理函数
LRESULT CALLBACK EditProcNew(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch (message)
 {
 case WM_PASTE:
  return DlgDoEditPaste(hWnd);
 case WM_CHAR:
  {
   g_bIsPasteMessage = FALSE;

   char sInfo[1024];
   memset(sInfo, 0, 1024);
   GetWindowText(hWnd, sInfo, 1024);
   int nEditTextLength = 4;

   int nStartSel = 0;
   int nEndSel = 0;
   SendMessage(hWnd, EM_GETSEL, (WPARAM)(LPDWORD)&nStartSel, (LPARAM)(LPDWORD)&nEndSel);

   LRESULT h = CallWindowProc(g_EditProcOrig, hWnd, message, wParam, lParam);
   char sInfo2[1024];
   memset(sInfo2, 0, 1024);
   GetWindowText(hWnd, sInfo2, 1024);
   if(strlen(sInfo2) > nEditTextLength)
   {    
    SetWindowText(hWnd, sInfo);
    SendMessage(hWnd, EM_SETSEL, nStartSel, nEndSel);
   }
   else
   {
    memset(sInfo, 0, 1024);
    strcpy(sInfo, sInfo2);
   }

   if(strlen(sInfo) >= nEditTextLength)
   {
    HWND hNextWnd = GetWindow(hWnd, GW_HWNDNEXT);
    if(::SendMessage(hNextWnd, WM_GETDLGCODE, 0, 0L) & DLGC_WANTCHARS)
    {
     if(!g_bIsPasteMessage)
      SetFocus(hNextWnd);
    }
   }
   return 0;   
  }
 default : break;
 }

 return CallWindowProc(g_EditProcOrig, hWnd, message, wParam, lParam);
}

//5。Edit 粘贴消息处理
BOOL DlgDoEditPaste(HWND hWnd)
{
   g_bIsPasteMessage = TRUE;

   if(!(::SendMessage(hWnd, WM_GETDLGCODE, 0, 0L) & DLGC_WANTCHARS))
      return FALSE;

   char szActivationKey[STRINGLENGTH];
   memset(szActivationKey, 0, STRINGLENGTH);
   char szSnippet[ID_VALUE_LENGTH];
   memset(szSnippet, 0, ID_VALUE_LENGTH);
 
   OpenClipboard(hWnd);
   HANDLE hText = GetClipboardData(CF_TEXT);
   CloseClipboard();

   int nEditTextLength = 40;
   if(hText != NULL)
   {
       if(strlen((char *)GlobalLock(hText)) >= nEditTextLength)
           memcpy(szActivationKey , (char *)GlobalLock(hText), nEditTextLength-1);
       else
           strcpy(szActivationKey , (char *)GlobalLock(hText));
  
       GlobalUnlock(hText);
   }

   nEditTextLength = 4;
 
   //string is like this 1234-5678-abcd-efgh-ijkl-mnop-qrst-uvwx
   CParseString oParseString(szActivationKey);
   char cReturn = '-';
   LPSTR lpszHeader = oParseString.GetNextSubString(cReturn, szSnippet);
   while (lpszHeader)
   {
      if(strlen(szSnippet) > 0)
      {
          if(strlen(szSnippet) > nEditTextLength)
          szSnippet[nEditTextLength] = '\0';

          do
          {
             if (SendMessage(hWnd, WM_GETDLGCODE, 0, 0L) & DLGC_WANTCHARS)
             {
                 SetFocus(hWnd);
                 SetWindowText(hWnd, szSnippet);
                 SendMessage(hWnd, EM_SETSEL, lstrlen(szSnippet), lstrlen(szSnippet)); 
                 memset(szSnippet, 0, ID_VALUE_LENGTH);

                 hWnd = GetWindow(hWnd, GW_HWNDNEXT);
                 break;
             }
             hWnd = GetWindow(hWnd, GW_HWNDNEXT);
    
          } while(hWnd != NULL && !(GetWindowLong(hWnd, GWL_STYLE) & WS_GROUP));

          if(hWnd == NULL || (GetWindowLong(hWnd, GWL_STYLE) & WS_GROUP))
          break;
      }

      lpszHeader = oParseString.GetNextSubString(cReturn, szSnippet);
   }

   return TRUE;
}