关于使用图元类TMetaFile的连接错误

[liujinglei]

我想使用图元类TMetaFile与图元画布类TMetaFileCanvas进行图形的操作，使用的是TMetaFileCanvas帮助说明中的一小段程序，但编译时出现如下的错误提示：请教各位朋友，这是什么原因？

[Linker Error] Unresolved external '__fastcall Graphics::TMetafileCanvas::TMetafileCanvas(Graphics::TMetafile *, int)' referenced from D:\BORLAND\CBUILDER5\LIB\RELEASE\VCLE50.LIB|_t_Graph



下面是程序的代码：


void __fastcall TForm1::Button1Click(TObject *Sender)
{
TMetafile *pMetafile = new TMetafile;

TMetafileCanvas *pCanvas = new TMetafileCanvas(pMetafile, 0);
pCanvas->Brush->Color = clRed;
pCanvas->Ellipse(0,0,100,100);

delete pCanvas;
Form1->Canvas->Draw(0,0,pMetafile); }