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      <font color="#800080">VC知识库（五）</font>
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      <font color="#800080">www.vckbase.com</font>
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      <strong><big>使用拖放的简单方法</big></strong>
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<p>如果要为窗口增加接受Drag&amp;Drop的功能，请按照以下步骤：</p>



<p>1、在OnCreate(...)中调用AcceptDrag(TRUE)。</p>



<p>2、增加消息映射</p>



<p>BEGIN_MESSAGE_MAP(……)<br>

&nbsp;&nbsp;&nbsp; //{{AFX_MSG_MAP(CDropEdit)<br>

&nbsp;&nbsp;&nbsp; ON_WM_CREATE()<br>

&nbsp;&nbsp;&nbsp; ON_WM_DROPFILES() // 关于Drag&amp;Drop的消息<br> 
 
&nbsp;&nbsp;&nbsp; //}}AFX_MSG_MAP<br>

END_MESSAGE_MAP()<br>

</p>



<p>3、处理消息</p>



<p>void CXXXXX::OnDropFiles(HDROP dropInfo)<br> 
 
{<br> 
 
&nbsp;&nbsp;&nbsp; // 得到Drag&amp;Drop的文件个数<br> 
 
&nbsp;&nbsp;&nbsp; WORD wNumFilesDropped = DragQueryFile(dropInfo, -1, NULL, 0);<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp; CString firstFile=&quot;&quot;;<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp; // <br>

&nbsp;&nbsp;&nbsp; for (WORD x = 0 ; x &lt; wNumFilesDropped; x++) {<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 得到PathName的长度,由于第三个参数为NULL，所以调用会失败并返回所需长度<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; WORD wPathnameSize = DragQueryFile(dropInfo, x,  
 
NULL, 0);<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 分配memory<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; char * npszFile = (char *) LocalAlloc(LPTR,  
 
wPathnameSize += 1);<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 分配错<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (npszFile == NULL) continue;<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 再次得到文件名<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DragQueryFile(dropInfo, x, npszFile,  
 
wPathnameSize);<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; firstFile=npszFile;</p>



<p><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 如果是shortCut则进行转换得到正确的文件名,expandedFile为最后的文件名<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CString  
 
expandedFile = ExpandShortcut(firstFile);<br> 
 
<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 释放memory<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LocalFree(npszFile);<br>

&nbsp;&nbsp;&nbsp; }<br>

<br>

&nbsp;&nbsp;&nbsp; //完成<br>

&nbsp;&nbsp;&nbsp; DragFinish(dropInfo);<br>

<br>

}<br>

</p>



<p>4、关于ExpandShortcut(...)</p>



<p>CString CXXXXX::ExpandShortcut(CString &amp;inFile)<br> 
 
{<br> 
 
&nbsp;&nbsp;&nbsp; CString outFile = &quot;&quot;;<br> 
 
<br> 
 
// Make sure we have a path<br> 
 
ASSERT(inFile != _T(&quot;&quot;));<br> 
 
<br> 
 
IShellLink* psl;<br> 
 
HRESULT hres;<br> 
 
LPTSTR lpsz = inFile.GetBuffer(MAX_PATH);<br> 
 
<br> 
 
// Create instance for shell link<br> 
 
hres = ::CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER,<br> 
 
IID_IShellLink, (LPVOID*) &amp;psl);<br> 
 
if (SUCCEEDED(hres))<br> 
 
{<br> 
 
// Get a pointer to the persist file interface<br> 
 
IPersistFile* ppf;<br> 
 
hres = psl-&gt;QueryInterface(IID_IPersistFile, (LPVOID*) &amp;ppf);<br> 
 
if (SUCCEEDED(hres))<br> 
 
{<br> 
 
// Make sure it's ANSI<br> 
 
WORD wsz[MAX_PATH];<br> 
 
::MultiByteToWideChar(CP_ACP, 0, lpsz, -1, wsz, MAX_PATH);<br> 
 
<br> 
 
// Load shortcut<br> 
 
hres = ppf-&gt;Load(wsz, STGM_READ);<br> 
 
if (SUCCEEDED(hres)) {<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
WIN32_FIND_DATA  
 
wfd;<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
//  
 
find the path from that<br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
HRESULT  
 
hres = psl-&gt;GetPath(outFile.GetBuffer(MAX_PATH), <br> 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
MAX_PATH,<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&amp;wfd, 

<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
SLGP_UNCPRIORITY);<br>

<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
outFile.ReleaseBuffer();<br>

}<br>

ppf-&gt;Release();<br>

}<br>

psl-&gt;Release();<br>

}<br>

<br>

&nbsp;&nbsp;&nbsp; inFile.ReleaseBuffer();<br>

<br>

&nbsp;&nbsp;&nbsp; // if this fails, outFile == &quot;&quot;<br> 
 
return outFile;<br> 
 
}</p> 
 
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