输入法编程——获取候选项

最新推荐文章于 2021-12-06 16:15:32 发布

Matrix_Designer

最新推荐文章于 2021-12-06 16:15:32 发布

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分类专栏： Windows 文章标签：输入法编程 null callback delete

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这段代码展示了如何在Windows中编程获取输入法的候选项列表。通过WM_IME_NOTIFY消息处理，当输入法打开候选窗口或者改变候选时，获取并显示候选项。当候选窗口关闭时，恢复默认提示文本。

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WNDPROC s_pOldProc = NULL;

LRESULT CALLBACK CImeFilterDlg::SubProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch (Msg)
{
case WM_IME_NOTIFY:
  if(wParam==IMN_OPENCANDIDATE || wParam==IMN_CHANGECANDIDATE )
  {
   HIMC hIMC = ::ImmGetContext(hWnd);

   if(hIMC != NULL)
   {
    DWORD dwSize = 0;
    ::ImmGetCandidateListCount(hIMC, &dwSize);

    for(UINT32 i=0; i<dwSize; ++i)
    {
     if((dwSize=::ImmGetCandidateList(hIMC, i, NULL, 0)) > 0)
     {
      LPCANDIDATELIST lpList = (LPCANDIDATELIST)new CHAR[dwSize];
      if (lpList == NULL)
      {
       continue;
      }

lpList->dwSize = sizeof(CANDIDATELIST);
dwSize = ::ImmGetCandidateList(hIMC, i, lpList, dwSize);

      if(lpList->dwCount > 0)
      {
       DWORD dwStart = lpList->dwPageStart;
       DWORD dwEnd = lpList->dwPageStart+lpList->dwPageSize > lpList->dwCount
        ? lpList->dwCount : lpList->dwPageStart+lpList->dwPageSize;
       CString data = (CString)(LPCWSTR)((PBYTE)lpList + lpList->dwOffset[dwStart]);

       for (UINT32 j = dwStart+1; j< dwEnd; j++)
       {
        LPCWSTR lpszString = (LPCWSTR)((PBYTE)lpList + lpList->dwOffset[j]);
        data += TEXT(" ");
        data += (CString)lpszString;
       }

       ((CImeFilterDlg *)AfxGetMainWnd())->SetDlgItemText(IDC_LBLCANDIDATE, data);
       data = (CString)(LPCWSTR)((PBYTE)lpList + lpList->dwOffset[lpList->dwSelection]);
       ((CImeFilterDlg *)AfxGetMainWnd())->SetDlgItemText(IDC_LBLCURCAND, data);
      }

      delete []lpList;
     }
    }

    ::ImmReleaseContext(hWnd, hIMC);
   }
  }
  else if(wParam == IMN_CLOSECANDIDATE)
  {
   ((CImeFilterDlg *)AfxGetMainWnd())->SetDlgItemText(IDC_LBLCANDIDATE, TEXT("输入法候选项..."));
   ((CImeFilterDlg *)AfxGetMainWnd())->SetDlgItemText(IDC_LBLCURCAND, TEXT("当前候选项..."));
  }

break;
default:
break;
}

return CallWindowProc(s_pOldProc, hWnd, Msg, wParam, lParam);
}

s_pOldProc = (WNDPROC)(INT64)::SetWindowLong(GetDlgItem(IDC_EDIT1)->GetSafeHwnd(), GWL_WNDPROC, (LONG)(INT64)SubProc);