插入图片 问题 大哥帮忙

jsp1988

<>这是我的代码</P>
<> if(OpenPictureDialog1-&gt;Execute())</P>
. X$ B# n0 c+ C7 a<>   {
   TMemoryStream *pm=new TMemoryStream();
$ G; B- v8 T7 i   Image1-&gticture-&gt;LoadFromFile(OpenPictureDialog1-&gt;FileName);
   TJPEGImage *jpg=dynamic_cast&lt;TJPEGImage*&gt;(Image1-&gticture-&gt;Graphic);
   if(jpg!=NULL)
    jpg-&gt;SaveToStream(pm);
% S( K: [9 a: {6 ?9 u8 D8 Y    else
    Image1-&gticture-&gt;Bitmap-&gt;SaveToStream(pm);
6 u  w% r7 W1 E' B3 h      ClientDataSet1-&gt;CommandText="insert into student1 (name1,name2,pic) values ('1','1',:picture)";</P>
9 H1 `9 t4 p9 n  _<>      ((TBlobField*)(ClientDataSet1-&gtarams-&gtaramByName("picture")))-&gt;LoadFromStream(pm);
6 d3 O. k4 a) N! C! y8 H& q        delete pm;
        ClientDataSet1-&gt;Execute();
     }</P>
; V+ [6 r5 T( U8 n<>在运行期间出错误 </P>
$ ~# n% ~. [4 D1 S; z3 Z<>rject project1.exe raised exception class
EAcessViolation with message ' Acess violation at address 40325fa4 in model
' dbrtl60.bpl '  read of address 94636b84</P>
<>请问大哥们改如何的改正</P>
<>谢谢！！</P>

ilikenba

<>((TBlobField*)(ClientDataSet1-&gtarams-&gtaramByName("picture")))-&gt;LoadFromStream(pm);这句的问题！</P><>TBlobField类是一个字段类！不能将参数转成字段！关于类的说明参见本版的帖子！</P>