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序號：36716 發(fā)表者：小丫多多 發(fā)表日期：2003-04-17 22:17:44
<br>主題：求教顯式加載DLL文件的問題！！
<br>內(nèi)容：我正在做一個數(shù)據(jù)采集的軟件，使用了一塊pc總線數(shù)據(jù)采集控制卡。<BR>隨該卡僅提供了一個DLL文件及一個在win2000下使用的驅(qū)動程序。<BR>安裝完驅(qū)動之后，dll文件自動考入WINNT\SYSTEM32目錄下。<BR>于是我在程序中顯示加載了該DLL，具體代碼如下：（我使用的是WIN2000系統(tǒng)）<BR>/////////////////////////////////////////////////////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;HINSTANCE hInstDll;<BR>&nbsp;&nbsp;&nbsp;&nbsp;unsigned short value;<BR>&nbsp;&nbsp;&nbsp;&nbsp;unsigned long time;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef unsigned short (*READCHDATA)(unsigned short, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unsigned char, unsigned long, unsigned long);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef unsigned short (*QPCOUNTER)(void);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef void (*OUTPORT)(unsigned short, unsigned char);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef void (*DELAY)(unsigned long);<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;READCHDATA&nbsp;&nbsp;&nbsp;&nbsp;ReadChData;<BR>&nbsp;&nbsp;&nbsp;&nbsp;QPCOUNTER&nbsp;&nbsp;&nbsp;&nbsp;GetCounter;<BR>&nbsp;&nbsp;&nbsp;&nbsp;OUTPORT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OutPort;<BR>&nbsp;&nbsp;&nbsp;&nbsp;DELAY&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delay;<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;hInstDll = GetModuleHandle("c:\\winnt\\system32\\k800.dll");<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(hInstDll == NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(hInstDll = LoadLibrary("c:\\winnt\\system32\\k800.dll"));<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(ReadChData =(READCHDATA)GetProcAddress(hInstDll, "read_ch_data"));<BR>&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(GetCounter = (QPCOUNTER)GetProcAddress(hInstDll, "q_p_counter"));<BR>&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(OutPort = (OUTPORT)GetProcAddress(hInstDll, "out_port"));<BR>&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(Delay = (DELAY)GetProcAddress(hInstDll, "adelay"));<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;time = GetCounter();<BR>&nbsp;&nbsp;&nbsp;&nbsp;value = ReadChData(768, 0, 150, 30);<BR>&nbsp;&nbsp;&nbsp;&nbsp;OutPort(770, 0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;Delay(10000);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;VERIFY(FreeLibrary(hInstDll));<BR><BR>/////////////////////////////////////////////////////////////////////////////<BR>系統(tǒng)編譯通過，運行時time = GetCounter();能正常運行，但一但運行到<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; value = ReadChData(768, 0, 150, 30);<BR>&nbsp;&nbsp;&nbsp;&nbsp;OutPort(770, 0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;Delay(10000);<BR><BR>這類帶有參數(shù)的函數(shù)時就會彈出消息框：debug error!<BR>說是函數(shù)調(diào)用方式不合適。<BR>不知為何？望高手賜教！！！萬分感謝！！！！<BR>
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<font color=red>答案被接受</font><br>回復(fù)者：xiongli 回復(fù)日期：2003-04-17 23:28:38
<br>內(nèi)容：可能是dll里面delay 函數(shù)參數(shù)聲明跟你程序里面的參數(shù)聲明不相同<BR>所以在最后函數(shù)返回的時候堆棧被破壞
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回復(fù)者：dr0 回復(fù)日期：2003-04-17 23:40:55
<br>內(nèi)容：typedef unsigned short (*READCHDATA)(unsigned short, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unsigned char, unsigned long, unsigned long);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef unsigned short (*QPCOUNTER)(void);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef void (*OUTPORT)(unsigned short, unsigned char);<BR>&nbsp;&nbsp;&nbsp;&nbsp;typedef void (*DELAY)(unsigned long);<BR><BR>// try : typedef void(__stdcall *delay)(unsigned long);<BR>// I guess your dll will export __stdcall routines to support VB etc <BR>// the compiler will generaet __cdecl call convention if you reserve<BR>// the default settings. have a try ?<BR>2003-4-17 23:41:37