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A .net question about the document which was recommended by 雁影行洲 yesterday, please help, thanks!

hillxie(我叫不紧张)

// Write the remaining buffer.
bw.Write(outbyte, 0, (int)retval - 1);

In this line I can not understand why use "(int)retval - 1" here, but not "(not)retval", could anybody give me a hint? thanks.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconobtainingblobvaluesfromdatabase.asp

(#1292653@0)
Last Updated: 2003-7-18
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工作学习 / IT技术讨论 / A .net question about the document which was recommended by 雁影行洲 yesterday, please help, thanks! -hillxie(我叫不紧张); 2003-7-18 {205} (#1292653@0)
// Write the remaining buffer.
bw.Write(outbyte, 0, (int)retval - 1);

In this line I can not understand why use "(int)retval - 1" here, but not "(not)retval", could anybody give me a hint? thanks.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconobtainingblobvaluesfromdatabase.asp

Maybe because outbyte is zero-based and retval is the size. -schen(欲语还休); 2003-7-18 (#1292720@0)

谢谢，我理解retval不是数组的size，而是buffer里最后剩下的字节数，这也是为什么我不理解最后要把它减一。 -hillxie(我叫不紧张); 2003-7-18 (#1293914@0)

still open... -hillxie(我叫不紧张); 2003-7-21 (#1297422@0)

This article might help. -lilyba(sunshine困惑不懂装懂); 2003-7-21 (#1297491@0)

谢谢，就是根据这个文档，retval应该为actual number of bytes read，所以不理解为什么字节个数还减一，那不就少了一个字节？搞不懂了。 -hillxie(我叫不紧张); 2003-7-21 (#1297543@0)

@Calgary

A .net question about the document which was recommended by 雁影行洲 yesterday, please help, thanks!

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