CRichEditCtrl::GetSelText() 无法正常工作

发布于 2024-08-22 17:50:14 字数 879 浏览 5 评论 0原文

MFC 文件：winctrl4.cpp

(C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\src\mfc)

CString CRichEditCtrl::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CStringA strText;
    LPSTR lpsz=strText.GetBufferSetLength((cr.cpMax - cr.cpMin + 1)*2); 
    lpsz[0] = NULL;
    ::SendMessage(m_hWnd, EM_GETSELTEXT, 0, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

我遇到一个奇怪的问题，当我调用它时，它只返回所选字符串的第一个字符。 cr 已正确设置，但在 ::SendMessage(m_hWnd, EM_GETSELTEXT,... 后，整个字符串不存在。

我在 my 中看到了类似的行为em> 自定义代码，由于 WCHAR 问题（一个字节中包含零），而预期是 CHAR 但这是 MFC/Win32 的一部分！可能我的 .rc 文件设置有问题吗？是否有与此相关的 Create 样式？或者既然我们为相关控件创建了一个 CFont，那么可能会搞砸吗？

原文

MFC File: winctrl4.cpp

(C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\src\mfc)

CString CRichEditCtrl::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CStringA strText;
    LPSTR lpsz=strText.GetBufferSetLength((cr.cpMax - cr.cpMin + 1)*2); 
    lpsz[0] = NULL;
    ::SendMessage(m_hWnd, EM_GETSELTEXT, 0, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

I am having a weird problem, when I call this it only returns the first character of the selected string. cr is correctly being set but after ::SendMessage(m_hWnd, EM_GETSELTEXT,... the whole string is not present.

I saw similar behavior in my custom code due to WCHAR issues (two-byte character containing a zero in one byte) when CHAR was expected. But this is part of MFC/Win32! Is it possible my .rc file sets something wrong? Is there a Create style relating to this? Or since we create a CFont for the control in question, could that screw it up?

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燃情 2024-08-29 17:50:14

这不是正确的 MFC 源代码，您是否编辑过它？使用 CStringA 和 LPSTR 是非常不合适的，实际代码使用 CString 和 LPTSTR 以便正确处理 Unicode。是的，正如发布的那样，代码只会返回一个字符。

查看版本有帮助。该错误在此反馈文章。如果您无法合理升级到VS2008 SP1，您可以从CRichEditCtrl 派生您自己的类并替换该函数。例如：

CString CRichEditCtrlFix::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CString strText;
    LPTSTR lpsz=strText.GetBufferSetLength((cr.cpMax - cr.cpMin + 1) * 2);
    lpsz[0] = NULL;
    ::SendMessage(m_hWnd, EM_GETSELTEXT, 0, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

This is not the correct MFC source code, have you edited it? Using CStringA and LPSTR is quite inappropriate, the real code uses CString and LPTSTR so that Unicode is correctly handled. Yes, as posted the code would only return one character.

Seeing the version helped. The bug is described in this feedback article. If you can't reasonably upgrade to VS2008 SP1, you could derive your own class from CRichEditCtrl and replace the function. For example:

CString CRichEditCtrlFix::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CString strText;
    LPTSTR lpsz=strText.GetBufferSetLength((cr.cpMax - cr.cpMin + 1) * 2);
    lpsz[0] = NULL;
    ::SendMessage(m_hWnd, EM_GETSELTEXT, 0, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

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半世蒼涼 2024-08-29 17:50:14

要获取宽字符字符串，您必须使用 EM_GETTEXTEX 消息。 CRichEditCtrl 源不包含利用此类消息的方法。
这是 GetSelText() 的正确实现，它实际上返回 Unicode 字符：

CString CRichEditCtrlFix::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CString strText;
    int sz = (cr.cpMax - cr.cpMin + 1) * sizeof(tchar);
    LPTSTR lpsz = strText.GetBufferSetLength(sz);
    lpsz[0] = NULL;
    GETTEXTEX gte;
    memset( >e, 0, sizeof(GETTEXTEX) );
    gte.cb = sz;
    gte.flags = GT_SELECTION;
    if( sizeof(tchar) == 2 ) gte.codepage = 1200;
    ::SendMessage(m_hWnd, EM_GETTEXTEX, (WPARAM)>e, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

1200 这里表示 UTF-16LE

To get a wide char string you have to use the EM_GETTEXTEX message. CRichEditCtrl source does not contain a method which utilizes such message.
Here is a correct implementation of GetSelText() which actually does return Unicode characters:

CString CRichEditCtrlFix::GetSelText() const
{
    ASSERT(::IsWindow(m_hWnd));
    CHARRANGE cr;
    cr.cpMin = cr.cpMax = 0;
    ::SendMessage(m_hWnd, EM_EXGETSEL, 0, (LPARAM)&cr);
    CString strText;
    int sz = (cr.cpMax - cr.cpMin + 1) * sizeof(tchar);
    LPTSTR lpsz = strText.GetBufferSetLength(sz);
    lpsz[0] = NULL;
    GETTEXTEX gte;
    memset( >e, 0, sizeof(GETTEXTEX) );
    gte.cb = sz;
    gte.flags = GT_SELECTION;
    if( sizeof(tchar) == 2 ) gte.codepage = 1200;
    ::SendMessage(m_hWnd, EM_GETTEXTEX, (WPARAM)>e, (LPARAM)lpsz);
    strText.ReleaseBuffer();
    return CString(strText);
}

1200 here means UTF-16LE

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