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<html><head><title>Iczelion's Win32 Assembly Tutorial 33: RichEdit Control: Basics</title><meta http-equiv="Content-Type" content="text/html; charset="></head><body bgcolor="#FFFFFF"><h1 align="center"><font face="Tahoma" color="#0000CC">Tutorial 33: RichEdit Control: Basics</font></h1><p align="left"><font face="Tahoma" size="-1">There are lots of request on tutorials about RichEdit controls. Finally I have played with it enough to think I can write tutorials about it. So here it is: the first RichEdit tutorial. The tutorials will describe nearly everything there is to know about RichEdit control or at least as much as I know it. The amount of information is rather large so I divide it into several parts, this tutorial being the first part. In this tutorial, you'll learn what a RichEdit control is, how to create it and how to load/save data to/from it.</font></p><p align="left"><font face="Tahoma" size="-1">Download <a href="files/tut33.zip">the example</a>.</font></p><h3 align="left"><font face="Times New Roman, Times, serif" color="#3333CC">Theory</font></h3><p align="left"><font face="Tahoma" size="-1">A richedit control can be thought of as a souped-up edit control. It provides many desirable features that are lacking from the plain simple edit control, for example, the ability to use multiple font face/size, multiple-level undo/redo, search-for-text operation, OLE-embedded objects, drag-and-drop editing support, etc. Since the richedit control has so many features, it's stored in a separate DLL. This also means that, to use it, you can't just call <font color="#336600"><b>InitCommonControls</b></font> like other common controls. You have to call <font color="#336600"><b>LoadLibrary</b></font> to load the richedit DLL.</font></p><p align="left"><font face="Tahoma" size="-1">The problem is that there are three versions of richedit control up till now. Version 1,2, and 3. The table below shows you the name of the DLL for each version.</font></p><table align="center" border="1"> <tr bgcolor="#CCFFCC"> <th nowrap><font face="MS Sans Serif" size="-1">DLL Name</font></th> <th nowrap><font face="MS Sans Serif" size="-1">RichEdit version</font></th> <th nowrap><font face="MS Sans Serif" size="-1">Richedit Class Name</font></th> </tr> <tr bgcolor="#FFFFCC"> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">Riched32.dll</font></th> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">1.0</font></th> <th nowrap><font face="MS Sans Serif" size="-1">RICHEDIT</font></th> </tr> <tr bgcolor="#FFFFCC"> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">RichEd20.dll</font></th> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">2.0</font></th> <th nowrap><font face="MS Sans Serif" size="-1">RICHEDIT20A</font></th> </tr> <tr bgcolor="#FFFFCC"> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">RichEd20.dll</font></th> <th nowrap><font face="MS Sans Serif" size="-1" color="#000000">3.0</font></th> <th nowrap><font face="MS Sans Serif" size="-1">RICHEDIT20A</font></th> </tr></table><p align="left"><font face="Tahoma" size="-1">You can notice that richedit version 2 and 3 use the same DLL name. They also use the same class name! This can pose a problem if you want to use specific features of richedit 3.0. Up to now, I haven't found an official method of differentiating between version 2.0 and 3.0. However, there is a workaround which works ok, I'll show you later.</font></p><pre align="left"><font face="Tahoma"><b><font color="#660066">.data</font></b></font><font color="#660066"><b><font face="Tahoma"> RichEditDLL db "RichEd20.dll",0<br> .....<br>.data?<br> hRichEditDLL dd ?<br>.code<br> <font color="#006600">invoke LoadLibrary,addr RichEditDLL<br> mov hRichEditDLL,eax</font><br> ......<br> <font color="#006600">invoke FreeLibrary,hRichEditDLL</font></font></b></font><font color="#660066"><b><font face="Tahoma"><font color="#006600"></font></font></b></font></pre><p align="left"><font face="Tahoma" size="-1">When the richedit dll is loaded, it registers the RichEdit window class. Thus it's imperative that you load the DLL before you create the control. The names of the richedit control classes are also different. Now you may have a question: how do I know which version of richedit control should I use? Using the latest version is not always appropriate if you don't require the extra features. So below is the table that shows the features provided by each version of richedit control.</font></p><table cellpadding="3" align="center" border="1"> <tr bgcolor="#CCFFCC"> <th nowrap><font face="MS Sans Serif" size="-1">Feature</font></th> <th nowrap><font face="MS Sans Serif" size="-1">Version 1.0</font></th> <th nowrap><font face="MS Sans Serif" size="-1">Version 2.0</font></th> <th nowrap><font face="MS Sans Serif" size="-1">Version 3.0</font></th> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">selection bar</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">unicode editing</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">character/paragraph formatting</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">search for text</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">forward</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">forward/backward</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">forward/backward</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">OLE embedding</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Drag and drop editing</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Undo/Redo</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">single-level</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">multi-level</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">multi-level</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">automatic URL recognition</font></td> <td> <div align="center"></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Accelerator key support</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Windowless operation</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Line break</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1">CRLF</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">CR only</font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">CR only (can emulate version 1.0)</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Zoom</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">Paragraph numbering</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">simple table</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">normal and heading styles</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">underline coloring</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div> </td> <td> <div align="center"><font face="MS Sans Serif" size="-1">x</font></div> </td> </tr> <tr bgcolor="#FFFFCC"> <td><font face="MS Sans Serif" size="-1">hidden text</font></td> <td> <div align="center"><font face="MS Sans Serif" size="-1"></font></div>?? 快捷鍵說明
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