主要用到函数说明：
_DMxDrawX::ReadBinStream
从二制流数据中加载图形，详细说明如下：
| 参数 | 说明 |
|---|---|
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VARIANT varBinArray |
二制流数据，是个byte数组 |
|
BSTR sPassword |
图纸密码.没有密码，传空字符串 |
|
LONG lReadContent |
加载内容，如果全部加载，传16777215,十六进制0xFFFFFF |
Delphi代码实现如下：
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function OleToMStream(OV:OleVariant): TMemoryStream;
var
Data: PByteArray;
Size: integer;
beginResult:=TMemoryStream.Create; try
Size:=VarArrayHighBound(OV,1)-VarArrayLowBound(OV,1)+1;
Data:=VarArrayLock(OV); try
Result.Position:=0;
Result.WriteBuffer(Data^,Size);
finally
VarArrayUnlock(OV);
end;
except
Result.Free;Result:=nil;
end;
end;
function MStreamToOle(Strm:TMemoryStream): OleVariant;
var
Data: PByteArray;
beginResult:= VarArrayCreate([0, Strm.Size - 1], varByte);
Data:= VarArrayLock(Result); try
Strm.Position := 0;
Strm.ReadBuffer(Data^, Strm.Size);
finally
VarArrayUnlock(Result);
end;
end;
procedure TForm2.Button6Click(Sender: TObject);
var
aryData:OleVariant;
memStream : TMemoryStream ;
aryReadData: OleVariant;
begin
// 写到内存流
MxDrawX1.WriteBinStream(aryData,'',23);
memStream := OleToMStream(aryData);
// 从内存流加载
aryReadData := MStreamToOle( memStream);
MxDrawX1.ReadBinStream(aryData,'',23);
end;
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