如何清除timage控件中的图形(clear the graphics in a timage control)
Delphi程序员使用TImage控件来显示图像。这些文件的扩展名包括ICO、BMP、WMF、WMF、GIF和JPG。Picture属性指定显示在TImage控件中的图像。Delphi支持几种不同的方法为TImage组件分配图像：例如，TPicture的LoadFromFile方法从磁盘读取图形，或者Assign方法从剪贴板获取图像。
如果没有清除Picture属性的直接命令，则需要为其指定一个“nil”对象。这样做基本上会使图像空白。
对于名为Photo的TImage控件，请使用以下两种方法之一清除指定的图形：
{code:delphi}Photo.Picture:=nil；{code}
或：
{代码：delphi}Photo.Picture.Assign（无）；{code}
任一代码块都将清除TImage控件中的图片。第一种方法将nil值断言为图片属性；第二种方法通过使用方法来分配nil。
- 发表于 2021-09-15 04:07
- 阅读 ( 188 )
- 分类：IT
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