我有一个第三方DLL,我想在C#中编写一个包装,并有C++示例代码,它的工作,但是当我尝试调用方法在DLL中,我得到的错误:从C#调用方法从C#没有任何信息,只有头文件
无法在DLL'scard-com.dll'中找到名为'scan'的入口点。
请帮忙指出我的问题:
这里是样品C++应用程序
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#项目.h文件的一部分,我加入这个类:
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,我就会得到上面的错误。任何帮助将不胜感激!
你发布的标题部分没有'scan'。 – Chris
DLL名称中的“COM”一词值得注意。就像标题中的声明一样,这是一个COM接口。不,他们不会导出这些功能。您只需添加对类型库的引用即可。通常嵌入在DLL本身中,所以使用Project> Add Reference> Browse按钮>选择scard-com.dll。 –
对不起,添加了错误的界面描述,编辑后显示正确。 – Thys