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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">Delphi的8个技巧</font><br><span class="nava"><font color="#CC9933">2000-08-05· -·逸仙时空</font></span></p><p> 1. delphi怎样调用外部EXE文件？ </p><p> uses WinProcs; . begin WinExec(......); . </p><p> end. 和调用Pascal库函数没什么两样。</p><p> 2. Delphi hint的字体和色彩如何改变Delphi中TApplication的属性有HintColor及HintPause。</p><p> 可以通过设置HintColor改变应用程序中的Hint的颜色、通过设置HintPause 改变触发Hint的时间。</p><p> 但遗憾的是：Delphi中Hint的字体不可以改变。</p><p> 3. Delphi里如何计算日期</p><p> 算时间在delphi中是最容易的，如下：</p><p> var ss : TDateTime </p><p> 其实Tdatetime是一个双精度的浮点数，它的小数点前表示天数：</p><p> 如，ss := ss + 20表示从ss开始向后20天，如果ss = 234.567 它就表示234.567天,当然是从公元0年开始计算的！</p><p> 4.如何用Delphi编ScreenSaver? (null) 屏幕保护程序无非是扩展名换成了.SCR的可执行程序，它接受两种命令行参数：</p><p> -s运行命令参数-c配置命令参数Windows通过向程序发-s命令行参数来启动程序。</p><p> 要注意的是：程序的窗口是无边框和标题；窗口大小应与屏幕大小一样；还要注意窗口的事件的处理。</p><p> 5. Delphi中如何改目录的名字</p><p> 调用RenameFile函数，如: </p><p> RenameFile('c:\wang\temp', 'c:\wang\tmp'); </p><p> 6. DELPHI显示JPEG图像文件</p><p> 只要uses中加入JPEG就行JPEG单元里是有一个TJPEGImage类,可定义一变量如Jpeg,用LoadFromFile调入某个JPEG文件,然后用Form的Canvas.Draw(x,y,Jpeg)即可显示. </p><p> 7. Delphi中对Jpeg格式文件的处理... </p><blockquote> <p>(1).在 Uses 中加入 JPEG 单元; </p> <p>(2).定义一个全程变量,例如 var AJPEG : TJPEGImage; </p> <p>(3).在 Form 的 OnCreate 事件中加入 : </p> <p> </p> <p>Canvas.Pen.Color:=clBlack; </p> <p>Canvas.Pen.Style:=psSolid; </p> <p>Canvas.Brush.color:=clBtnFace; </p> <p>Canvas.Brush.Style:=bsSolid; //此上是设置 Canvas 的一些属性,便于以后 </p> <p>//Clear Form and Load a new JPEG file; </p> <p>AJpeg:=TJpegImage.Create;//动态生成AJpeg; </p> <p>AJpeg.LoadFromFile('D:\Temp.jpg') //生成 AJpeg 后,调入 JPEG 文件 ; </p> <p> </p>⌨️ 快捷键说明
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