很久没写随笔了,有点想关了这个博客,不再更新,但还是没有下定决心。趁这些天比较闲,发一个以前写着玩的功能吧。
复制、粘贴功能是一件很简单的事情,但怎样将GIS图形粘贴到word中呢?最简单的思路还是将GIS图形保存为Image形式,发送到剪贴板,再粘贴到Word。但如果Image格式采用栅格的格式,如BMP或JPEG,则粘贴后在Word中拉伸时,效果会受到影响,比较合适的格式是采用WMF或EMF这种矢量的格式。将Visio格式复制到Word中时,可以看到就是这种效果,而且文字还是可以编辑的。好,下面我们就看看怎样实现这个功能。
第一步当然是将图形复制为一个MetaFile对象:
public Metafile GetGeometryMetafile(ISymbol pSymbol, IGeometry pGeometry)
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{
//先获取一个IDisplayTransformation对象
IDisplayTransformation pDisTrans = new DisplayTransformationClass();
IEnvelope pEnv = pGeometry.Envelope;
Rectangle rect = new Rectangle(0, 0, 500, 500);
tagRECT r;
r.left = rect.Left;
r.right = rect.Right;
r.bottom = rect.Bottom;
r.top = rect.Top;
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pDisTrans.set_DeviceFrame(ref r);
pDisTrans.Bounds = pEnv;
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pDisTrans.Resolution = 72;
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pDisTrans.ReferenceScale = 1.0;
pDisTrans.ScaleRatio = 1;
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//创建WMF
MemoryStream ms = new MemoryStream();
Graphics g = CreateGraphics();
IntPtr hdc = g.GetHdc();
Metafile mf = new Metafile(ms, hdc, new Rectangle(0,0,500,500),MetafileFrameUnit.Pixel, EmfType.EmfPlusDual);
g.ReleaseHdc(hdc);
g.Dispose();
g = Graphics.FromImage(mf);
g.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, 500, 500));
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pSymbol.SetupDC((int)g.GetHdc(), pDisTrans);
pSymbol.Draw(pGeometry);
pSymbol.ResetDC();
g.ReleaseHdc();
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g.DrawString("by watson", this.Font, new SolidBrush(Color.Blue), new PointF(20, 20));
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g.Save();
g.Dispose();
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return mf;
}
第二步:发送到剪贴板:
IDataObject data = new DataObject();
data.SetData(DataFormats.MetafilePict, mf);
Clipboard.SetDataObject(data, true);
测试 .... 什么,不成功??
估计是.net不支持将metafile格式复制到剪贴板吧。
于是,用于搜索引擎,搜索一翻,在某国外论坛找到解决方案:
public class ClipboardMetafileHelper
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{
[DllImport("user32.dll")]
static extern bool OpenClipboard(IntPtr hWndNewOwner);
[DllImport("user32.dll")]
static extern bool EmptyClipboard();
[DllImport("user32.dll")]
static extern IntPtr SetClipboardData(uint uFormat, IntPtr hMem);
[DllImport("user32.dll")]
static extern bool CloseClipboard();
[DllImport("gdi32.dll")]
static extern IntPtr CopyEnhMetaFile(IntPtr hemfSrc, IntPtr hNULL);
[DllImport("gdi32.dll")]
static extern bool DeleteEnhMetaFile(IntPtr hemf);
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// Metafile mf is set to an invalid state inside this function
static public bool PutEnhMetafileOnClipboard(IntPtr hWnd, Metafile mf)
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{
bool bResult = false;
IntPtr hEMF, hEMF2;
hEMF = mf.GetHenhmetafile(); // invalidates mf
if (!hEMF.Equals(new IntPtr(0)))
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{
hEMF2 = CopyEnhMetaFile(hEMF, new IntPtr(0));
if (!hEMF2.Equals(new IntPtr(0)))
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{
if (OpenClipboard(hWnd))
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{
if (EmptyClipboard())
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{
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IntPtr hRes = SetClipboardData(14 /**//*CF_ENHMETAFILE*/, hEMF2);
bResult = hRes.Equals(hEMF2);
CloseClipboard();
}
}
}
DeleteEnhMetaFile(hEMF);
}
return bResult;
}
}
调用
PutEnhMetafileOnClipboard方法就可以了,
再测试....大功告成!
再看一看
PutEnhMetafileOnClipboard中的代码,比较特别的是
CopyEnhMetaFile函数,将MetaFile在内存中复制一份,看来是.net中的metafile与Windows中的metafile格式有一定出入,windows剪贴板不认识的缘故吧。
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