C#調用C++寫的DLL問題,急

[jock_liu]

廠商有提供一VC++寫的dll文件(含abc.dll,abc.lib,a.h共3個當案)
我現在用C#寫的程式準備調用abc.dll,我使用DLLIMPORT引入
再調试的時候,顯示無法找到函數的入口,我用VC做的話只需要引入
a.h即可,請問在C#中該如何做,謝謝.

[wangzhe1945]

放到当前程序目录中，DLLIMPORT， 申明为外部函数，就可以调用了

[jock_liu]

public RTD_Program(int comPort,StringBuilder str)
{
_comPort = comPort;
_strFile = new StringBuilder();
_strFile = str;
//_flashaddr = \Xff000;
}
//[DllImport("debugtools_library.dll", EntryPoint = "SetHDCP_CODE")]
[DllImport("debugtools_library.dll")]
private static extern long RtdProgram
(
int comport,
ref StringBuilder strFile,
UInt32 flashaddr,
int mode
);
//[DllImport("debugtools_library.dll", EntryPoint = "GetHDCP_CODE")]
[DllImport("debugtools_library.dll")]
private static extern long RtdRead
(
int comport,
UInt32 flashaddr,
UInt32 length,
ref StringBuilder strFile //unsigned
);
public long Write_HDCP()
{
retval = RtdProgram(_comPort, ref _strFile, 0xff000, 2);
return retval;
}
public StringBuilder Read_HDCP()
{
RtdRead(_comPort, 0xff000, 320, ref _strBuff);
return _strBuff;
}
再執行public long Write_HDCP()的時候報錯
在DLL'debugtools_library.dll中找不到RtdProgram進入點
dll函數接口
__declspec(dllexport) long RtdProgram(int comport, char* strFile, UINT32 flashaddr, int mode);
__declspec(dllexport) long RtdRead(int comport, UINT32 flashaddr, UINT32 length, unsigned char* getData);