prompt={'请输入初始密钥','请设置水印路径'};
    def={'10000','e:/image/watermark.bmp'};
    dlgTitle='生成水印';
    lineNo=1;
    Ans=inputdlg(prompt,dlgTitle,lineNo,def);

 % s=['0.',Ans];
 % %将得到的结果处理为小于1.
 %    Ans=str2num(cell2mat(s));

 original=['0.',Ans{1}];
 file=Ans{2};
 original=str2num(original);
 %需要转换成数值型，不能直接用str2num

===================================

prompt={'左上角X','左上角Y','右上角X','右上角Y'};
 title='请输入要截取的坐标点值';
 lines=1;
 def={'0','0','200','200'};
 % answer=inputdlg(prompt,title,lines,def);
 mya=inputdlg(prompt,title,lines,def,'on');
 % key1=str2num(mya(1));
 % key2=str2num(mya(2));
 % key3=str2num(mya(3));
 % key4=str2num(mya(4));
 % key11=cell2mat(mya(1));
 % key1=key11(1);
 % key21=cell2mat(mya(2));
 % key2=key21(1);
 % key31=cell2mat(mya(3));
 % key3=key31(1);
 % key41=cell2mat(mya(4));
 % key4=cell2mat(key41);
 % key1=0;
 % key2=0;
 % key3=200;
 % key4=200;
 key11=[mya{1}];
 key22=[mya{2}];
 key33=[mya{3}];
 key44=[mya{4}];
 % 
 key1=str2num(key11);
 key2=str2num(key22);
 key3=str2num(key33);
 key4=str2num(key44);