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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">实现应用程序的文件拖放功能 </font><br><span class="nava"><font color="#CC9933">2000-07-01· －·－</font></span></p><p> 在Delphi中有许多控件支持拖放操作,但仅限于 应用程序内部,而不能实现从Windows环境里向应用程序拖放文件,本文将要介绍的就是如 何用Delphi编写支持文件拖放的应用程序,由于主要使用WindowsAPI函数,因此也可供其 它语言使用者参考. <p> 首先要说明的是下面的三个API函数,为通用起见, 函数说明使用C语言格式, <pre> 1.VOIDDragAcceptFiles(HWNDhWnd,BOOLfAccept);</pre> DragAcceptFiles函数是用来为拖放文件作初始化, 它的第一个参数hWnd指明目标窗体的句柄,第二个参数fAccept是一个布尔型变量,为True时 则hWnd所指向的窗体可以接受拖放的文件. <pre> 2.UINTDragQueryFile(HDROPhDrop,UINTiFile,LPTSTRlpszFile,UINTcch) </pre> DragQueryFile函数用来查询拖放文件的文件名,其 本身的返回值是一个无符号整数,参数hDrop是一个存放所拖放文件名称的数据结构的句柄, 也就是文件名缓冲区的句柄,需要从Windows消息WM_DROPFILES中获得.iFile指明所要查询 文件的序号,它有两种取值方式,1.值为十六进制数FFFFFFFF时,DragQueryFile的返回值为 所拖放文件的数目;2.值在0到拖放文件总数之间时,DragQueryFile函数将相应序号的文件 名放入参数lpszFile所指向的缓冲区内,若此时lpszFile的值为NULL,则DragQueryFile会返 回相应文件名的长度.参数cch决定缓冲区的长度,由于Windows95支持长文件名,它的值不能 设得太小. <pre> 3.VOIDDragFinish(HDROPhDrop);</pre> 使用DragFinish函数告诉Windows拖放操作结束,使 其释放文件名缓冲区,它的参数hDrop与DragQueryFiles函数中的一样,也由Windows消息WM_DROPFILES 的hDrop参数获得. <p> 下面将结合一个我编写的例子来说明具体的编程 步骤.本例中窗体上放置了一个Memo控件memo1,在Windows中选取数个文件拖至程序窗体 放下,则memo1中便会显示所选文件的总数及每个文件的各自名称.程序代码如下: <pre>unitUnit1;interfaceusesWindows,Messages,SysUtils,Classes,Graphics,Controls,Forms,Dialogs,StdCtrls;typeTForm1=class(TForm)Memo1:TMemo;procedureFormCreate(Sender:TObject);procedureLabel3Click(Sender:TObject);procedureLabel4Click(Sender:TObject);privatePROCEDUREFinishDropped(VARMsg:TMessage);MessageWM_DropFiles;{Privatedeclarations}public{Publicdeclarations}end;varForm1:TForm1;implementationusesshellapi;⌨️ 快捷键说明
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