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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">如何对数据流 INSERT、APPEND</font><br><span class="nava"><font color="#CC9933">2000-05-27· 吴卫中·CPCW</font></span></p><p align="JUSTIFY"> 如果不是第一次初始化的话。因此，有必要对多段数据流的整合操作做一些有利的约束。如增加INSERT(插入)、 APPEND(追加)之类的方法。从TStream的定义及其派生子类我们得知，CopyFrom是唯一可以加以利用的公用函数，它从指定的流上拷贝指定数量的字节后返回一长整型值，该值代表最后成功传送的实际字节数。其后，我们用Seek函数来避免数据流之间的相互覆盖，并以此来界定后来者加入的位置。在SEEK函数的定义中，第一个参数为偏移量，第二个参数是个定位标识，其定义如下：<br> </p> <blockquote> <p> soFromBeginning表示在流的顶头开始位移，第一个参数必须 >=0.<br> soFromCurrent表示从当前位置开始位移。<br> soFromEnd表示从流的最后开始位移，第一个参数必须<= 0.<br></p></blockquote><p align="justify"> SEEK操作成功后，由Position属性存放流当前的位置值。Size属性是该流到目前为止的长度。 <br><p align="JUSTIFY"> 具体操作见以下范例：<br> unit DemoUnit;<br> ...<br> <br> </p> <blockquote> <p> type<br> </p> <blockquote> <p> TForm1 = class(TForm)<br> ...<br> Memo1: TMemo; <br> procedure FormCreate(Sender: TObject);<br> procedure Button1Click(Sender: TObject);<br> procedure FormDestroy(Sender: TObject);<br> procedure Button2Click(Sender: TObject);<br> procedure Button3Click(Sender: TObject);<br> </p> <p> private<br> </p> <blockquote> <p> { Private declarations }<br> // 建立一个演示内存流<br> STO : TMemoryStream;<br> </p> </blockquote> <p> public<br> </p> <blockquote> <p> { Public declarations }<br> </p> </blockquote> <p> end;<br> <br> var<br> Form1: TForm1;<br> implementation<br> {$R *.DFM}<br> procedure TForm1.FormCreate(Sender: TObject);<br> begin<br> </p> <blockquote> <p> ...<br> </p> </blockquote> <p> Try<br> //创建内存流的对象<br> </p> <blockquote> <p> STO := TMemoryStream.Create;<br> </p> </blockquote> <p> Finally<br> </p> <blockquote> <p> ...<br> </p> </blockquote> <p> end;<br> </p> <p> ...<br> </p> </blockquote> <p> end;<br> <br> procedure TForm1.Button1Click(Sender: TObject);<br> begin<br> </p> <blockquote> <p> ...<br> //初始化内存流对象，并移动指针到头部 <br> STO.LoadFromFile( OpenDialog1.FileName );<br>⌨️ 快捷键说明
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