function Encrypt(const OrignStr,Key: PChar; NewStr,ErrStr:PChar): Boolean;stdcall;
[DllImport("Encrypt.dll", CharSet=CharSet.Ansi, CallingConvention=CallingConvention.StdCall)]
public static extern string Encrypt(string OrignStr,string Key, StringBuilder NewStr, StringBuilder ErrStr);
string key = tbxKey.Text;
StringBuilder mw = new StringBuilder(); //密文变量
StringBuilder err = new StringBuilder(); //错误信息
myDES.DESEncryptString(tbxYw.Text, key, mw, err);
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