現在, 我想用Dll.dll入面的function abc, 但是, c++是可以pass "null" 到 int, e.g abc(null,"",200);
但是c#不能吧, 救命~~
DllImport("Dll.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern bool abc(int hParent,string lpszDeviceName, int dwMaxDeviceName);