将较大的字符串粘贴到文本框控件（MFC）中可能会出现啥问题

Posted 2023-02-16

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【中文标题】将较大的字符串粘贴到文本框控件（MFC）中可能会出现啥问题【英文标题】：What could be going wrong pasting a largish string into a textbox control (MFC)将较大的字符串粘贴到文本框控件（MFC）中可能会出现什么问题 【发布时间】：2015-01-21 02:19:16 【问题描述】：

我有 10965 个字符的大文本。确切的文字是：

http://abcx57.al2.testdomain.com:27000/arcs/select/?defType=edismax&timeAllowed=600000&pieces=arcs57.zx3.mycompany.com:27000/arcs,arcs59.zx3.mycompany.com:27000/arcs,&start =0&rows=50&q=-jid%3a25003-&debugQuery=false&sort=mtm+desc,score+desc&fq=---clid%3a10-+OR+-clid%3a12-+OR+-clid%3a17-+OR+-clid%3a16- +OR+-clid%3a26-+OR+-clid%3a30-+OR+-clid%3a104-+OR+-clid%3a106-+OR+-clid%3a108-+OR+-clid%3a109-+OR+-clid%3a117-+ OR+-clid%3a118-+OR+-clid%3a111-+OR+-clid%3a122-+OR+-clid%3a123-+OR+-clid%3a139-+OR+-clid%3a112-+OR+-clid%3a67-+OR+ -clid%3a146-+OR+-clid%3a167-+OR+-clid%3a195-+OR+-clid%3a45-+OR+-clid%3a46-+OR+-clid%3a60-+OR+-clid%3a196-+OR+- clid%3a698-+OR+-clid%3a701-+OR+-clid%3a712-+OR+-clid%3a643-+OR+-clid%3a771-+OR+-clid%3a210-+OR+-clid%3a772-+OR+-clid %3a775-+OR+-clid%3a461-+OR+-clid%3a777-+OR+-clid%3a657-+OR+-clid%3a144-+OR+-clid%3a533-+OR+-clid%3a720-+OR+-clid% 3a170-+OR+-clid%3a207-+OR+-clid%3a209-+OR+-clid%3a227-+OR+-clid%3a241-+OR+-clid%3a615-+OR+-clid%3a637-+OR+-clid%3a642 -+OR+-clid%3a468- +OR+-clid%3a476-+OR+-clid%3a482-+OR+-clid%3a296-+OR+-clid%3a264-+OR+-clid%3a267-+OR+-clid%3a270-+OR+-clid%3a271-+ OR+-clid%3a279-+OR+-clid%3a280-+OR+-clid%3a286-+OR+-clid%3a292-+OR+-clid%3a723-+OR+-clid%3a724-+OR+-clid%3a725-+OR+ -clid%3a738-+OR+-clid%3a740-+OR+-clid%3a741-+OR+-clid%3a742-+OR+-clid%3a743-+OR+-clid%3a744-+OR+-clid%3a745-+OR+- clid%3a747-+OR+-clid%3a748-+OR+-clid%3a749-+OR+-clid%3a750-+OR+-clid%3a752-+OR+-clid%3a758-+OR+-clid%3a763-+OR+-clid %3a333-+OR+-clid%3a690-+OR+-clid%3a691-+OR+-clid%3a262-+OR+-clid%3a653-+OR+-clid%3a656-+OR+-clid%3a658--+OR+--卷%3a2-+OR+-卷%3a3-+OR+-卷%3a17-+OR+-卷%3a47-+OR+-卷%3a48-+OR+-卷%3a53-+OR+-卷%3a54-+OR+-卷%3a63-+OR+-roll%3a64-+OR+-roll%3a65-+OR+-roll%3a97-+OR+-roll%3a102-+OR+-roll%3a224-+OR+-roll%3a227-+OR+-roll% 3a228-+OR+-roll%3a242-+OR+-roll%3a289-+OR+-roll%3a305-+OR+-roll%3a306-+OR+-roll%3a327-+OR+-roll%3a328-+OR+-roll%3a329 -+OR+-roll%3a346-+OR+-roll%3a347-+OR+-roll%3a348-+OR+-roll%3a349-+OR+-roll%3a350-+OR+-roll%3a354-+OR +-roll%3a428-+OR+-roll%3a429-+OR+-roll%3a617-+OR+-roll%3a668-+OR+-roll%3a739-+OR+-roll%3a880-+OR+-roll%3a988-+OR+ -roll%3a992-+OR+-roll%3a1065-+OR+-roll%3a1073-+OR+-roll%3a1074-+OR+-roll%3a1075-+OR+-roll%3a1078-+OR+-roll%3a1079-+OR+-卷%3a1080-+OR+-卷%3a1081-+OR+-卷%3a1082-+OR+-卷%3a1083-+OR+-卷%3a1084-+OR+-卷%3a1085-+OR+-卷%3a1086-+OR+-卷%3a1087-+OR+-roll%3a1088-+OR+-roll%3a1090-+OR+-roll%3a1154-+OR+-roll%3a1155-+OR+-roll%3a1159-+OR+-roll%3a1163-+OR+-roll% 3a1179-+OR+-roll%3a1209-+OR+-roll%3a1210-+OR+-roll%3a1211-+OR+-roll%3a1216-+OR+-roll%3a1386-+OR+-roll%3a1388-+OR+-roll%3a1445 -+OR+-roll%3a1488-+OR+-roll%3a1503-+OR+-roll%3a1556-+OR+-roll%3a1678-+OR+-roll%3a1701-+OR+-roll%3a1906-+OR+-roll%3a1907- +OR+-roll%3a1955-+OR+-roll%3a2080-+OR+-roll%3a2083-+OR+-roll%3a2084-+OR+-roll%3a2085-+OR+-roll%3a2086-+OR+-roll%3a2087-+ OR+-roll%3a2088-+OR+-roll%3a2089-+OR+-roll%3a2090-+OR+-roll%3a2091-+OR+-roll%3a2092-+OR+-roll%3a2131-+OR+-roll%3a2132-+OR+ -roll%3a2133-+OR+-roll%3a2134-+OR+-rol 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zxfilerdisp&f.zxfilerdisp.place.limit=4&f.zxfilerdisp.place.query=_val_%3ascore&f.zxfilerdisp.place.mincount=1&place.field=folder_string&f.folder_string.place.limit=4&f.folder_string.place.query=_val_%3ascore&f. folder_string.place.mincount=1&fl=atyp,ccn,clid,roll,szkb,mtm,accesstime,jid,cijid,bktm,afid,afof,afln,conv,conv,mtm,atto,to,from,cc,bcc, lnks,lnkows,tosmtp,fmsmtp,ccsmtp,bcsmtp,rclst,fmrclst,msgflags,url,crtm,contenttype,ext_name,cistate,contentid,dcflags,dozxector,文件夹,文件夹,zxex,xheader,folder_string,zxturboguid,hasattach,zxstub, fromdisp,todisp,ccdisp,bccdisp,zxfilerdisp,zxrefcopyguid,zxref

我需要将其粘贴到基于对话框的 MFC 应用程序的文本框中。如果我粘贴此文本，则该文本根本不会显示在控件中。我确实看到了插入符号，可以移动它，使用 home 键或 end 键，但没有显示任何文本。

使用 DDX 连接的内部变量 m_url 包含整个字符串，但它只是不显示。

相同的代码适用于小字符串。以下是我可以成功粘贴到文本框中并在那里显示的最大值：

如果我再输入一个字符，文本框中的文本就会消失。

我使用的是 Visual Studio 2013。行为与 Debug 和 Release Unicode Win32 版本相同。

以前有人遇到过这种情况吗？如何克服这一点？

【问题讨论】：

与其说是重复，因为这个问题是在问如何克服它。 ***.com/questions/180853 可能相关：msdn.microsoft.com/en-us/library/windows/desktop/… 【参考方案1】：

我也经历过同样的事情。您可以通过使用 SetLimitText（EM_SETLIMITTEXT ...我认为）来增加字符数量。但是，这不是由于字符数。我相信这与超过 16 位 GDI 限制 32,767 像素有关。单行编辑控件会发生这种情况。如果你有多行，那么它似乎可以很好地包装。

您可以创建一个 IC，并编写一些代码来确定您要显示的文本的宽度。

CDC dc;
dc.CreateIC("display", NULL, NULL, NULL);

CFont* pFont = GetDlgItem(IDC_EDIT1)->GetFont();  // use appropriate ID
CFont* pOldFont = dc.SelectObject(pFont);

CSize sz = dc.GetTextExtent(strYourMaxString); //sz.cx contains your string, probably approaching 32,767

dc.SelectObject(pOldFont);

我的经验：Limits on single line edit control? GDI related?

【讨论】：

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