我有一個第三方DLL,我想在C#中編寫一個包裝,並有C++示例代碼,它的工作,但是當我嘗試調用方法在DLL中,我得到的錯誤:從C#調用方法從C#沒有任何信息,只有頭文件
無法在DLL'scard-com.dll'中找到名爲'scan'的入口點。
請幫忙指出我的問題:
這裏是樣品C++應用程序
interface ISCard_CardReaderDevices : IUnknown {
virtual UINT __stdcall scan(void) = 0;
virtual UINT __stdcall getDeviceCount(void) = 0;
virtual const CHAR * __stdcall getDeviceName(UINT id) = 0;
virtual const CHAR * __stdcall getSerialName(UINT id) = 0;
virtual ISCard_CardReader * __stdcall connectById(UINT id) = 0;
virtual ISCard_CardReader * __stdcall connectByName(const CHAR *name) = 0;
virtual ISCard_CardReader * __stdcall connectBySerial(const CHAR *serial) = 0;
virtual BOOL __stdcall disconnect(ISCard_CardReader *reader) = 0;
virtual ISCard_SecMsg * __stdcall attachSecMsg(ISCard_CardReader *reader) = 0;
virtual void __stdcall detachSecMsg(ISCard_SecMsg *secMsg) = 0;
virtual ISCard_Script * __stdcall attachScript(ISCard_CardReader *reader) = 0;
virtual void __stdcall detachScript(ISCard_Script *script) = 0;
virtual ISCard_IsoCard * __stdcall attachIsoCardByReader(ISCard_CardReader *reader) = 0;
virtual ISCard_IsoCard * __stdcall attachIsoCardBySecMSG(ISCard_SecMsg *secMsg) = 0;
virtual void __stdcall detachIsoCard(ISCard_IsoCard *isocard) = 0;
virtual ISCard_MTCOS * __stdcall attachMTCOSByReader(ISCard_CardReader *reader) = 0;
virtual ISCard_MTCOS * __stdcall attachMTCOSBySecMSG(ISCard_SecMsg *secMsg) = 0;
virtual void __stdcall detachMTCOS(ISCard_MTCOS *os) = 0;
virtual ISCard_IcaoConverter * __stdcall attachIcaoConverter(void) = 0;
virtual void __stdcall detachIcaoConverter(ISCard_IcaoConverter *icaoconv) = 0;
virtual ISCard_ImageConverter * __stdcall attachImageConverter(void) = 0;
virtual void __stdcall detachImageConverter(ISCard_ImageConverter *imgconv) = 0;
#ifdef MULTIAPP_EXT
virtual ISCard_IDLConverter * __stdcall attachIDLConverter(void) = 0;
virtual void __stdcall detachIDLConverter(ISCard_IDLConverter *idlconv) = 0;
virtual ISCard_sscdConverter * __stdcall attachSSCDConverter(void) = 0;
virtual void __stdcall detachSSCDConverter(ISCard_sscdConverter *sscdconv) = 0;
virtual ISCard_eHealthConverter * __stdcall attacheHealthConverter(void) = 0;
virtual void __stdcall detacheHealthConverter(ISCard_eHealthConverter *eHealthconv) = 0;
#endif // MULTIAPP_EXT
};
用在我的C#項目.h文件的一部分,我加入這個類:
public class SCardWrapper
{
[DllImport("scard-com.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern uint scan();
// And call it like this:
public int listReaders()
{
try
{
uint numreaders = scan();
if (numreaders < 1)
{
return 0;
}
for (int i = 0; i < numreaders; i++)
{
IntPtr iDevice = getDeviceName(uint.Parse(i.ToString()));
String sDevice = Marshal.PtrToStringAuto(iDevice);
Debug.WriteLine(string.Format("{0} : " + sDevice, i));
}
return int.Parse(numreaders.ToString());
}
catch
{
return -1;
}
}
}
但是,只要它碰到scan()方法,我就會得到上面的錯誤。任何幫助將不勝感激!
你發佈的標題部分沒有'scan'。 – Chris
DLL名稱中的「COM」一詞值得注意。就像標題中的聲明一樣,這是一個COM接口。不,他們不會導出這些功能。您只需添加對類型庫的引用即可。通常嵌入在DLL本身中,所以使用Project> Add Reference> Browse按鈕>選擇scard-com.dll。 –
對不起,添加了錯誤的界面描述,編輯後顯示正確。 – Thys