关于Dll调用的一个很奇怪的问题(50分)

在unit中声明：function CMPP3Submit;external 'SMEIDLL.DLL' name 'CMPP3Submit';<br>然后在 unit2的 btn1的onclick中调用:cmpp3submit OK，没问题:<br>但是把 &nbsp;CMPP3Submit 写到 &nbsp;cmppsub函数中，再从 btn1的 onclick中调用 cmppsub<br>则dll报错,为什么?<br>也就是说，直接调用OK，间接调用就出错<br>注：CMPP3Submit带有二十多个参数，我省略了。。。

报什么错,

Access Violation at address 1003CCF7 in module 'SMEIDLL.Dll' write of address <br>0048ED30<br><br>----这就是出错信息

这个函数声明你没写Result类型和调用规则啊<br>function CMPP3Submit;external 'SMEIDLL.DLL' name 'CMPP3Submit';<br>应该是：<br>function CMPP3Submit[red]: Boolean[/red]; [blue]stdcall; [/blue]external 'SMEIDLL.DLL' name 'CMPP3Submit';<br>之类的啊<br>而且，可能这个dll函数有参数，需要访问栈中的数据，放入另外一个函数内部后，栈现场就变化了哈，所以出错。详细看看你的函数声明对不对。

不好意思，是我没写清楚<br>在 interface 部份 <br>function CMPP3Submit(byPKTotal:char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byPKNumber:Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SRR:Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byMsgLevel: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ServiceSubType: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byFeeUserType: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sFeeAddr: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byFeeTerminalType:Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PID: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Default_ID: LongWord;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; UDHI:Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DCS: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sSPIDChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sFeeType: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sFeeCode: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Schedule: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Expire: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; OrgAddr: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byUserNum: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sDestAddrs: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byDestTerminalType: Char;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; UDLen: longWord;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; UserData: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sLinkID: PChar;<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; byMsgID: PChar): Integer; stdcall;<br><br>这是函数说明（参数有点多，呵呵）<br><br>在 implementation 部份 <br><br>function CMPP3Submit; &nbsp;external 'SMEIDLL.DLL' name 'CMPP3Submit';<br>这是外部函数声明<br><br>在调用时直接调用没有问题，但是一但放入其它函数里再调用就会出错<br>同一个Dll文件，其它的函数直接调用 或放入其它函数内调用都没有问题<br>zqw0117 说的 “栈现场就变化了” 应该怎样解决？<br>不知道与参数类型有没有关系呢？

发现有几个参数只能志声明在直接调用该函数的地方，定义在其它地方就会报错

多人接受答案了。