输入参数过多

Question

我收到以下关于我的 fprintf 函数中输入参数过多的错误消息。但在我看来，只是传递了适量的论据。

所有这些都是在我制作的指南 GUI 的上下文中进行的（见最后的图片）。

Error while evaluating uicontrol Callback

calibration button hit
    20

   200

10
10
        2520

       25197

2520
25197
    'C0 2520 25197 10 10'

Error using serial/fprintf (line 115)
Too many input arguments.

Error in UserInterface>StaticCalibrationBtn_Callback (line 202)
fprintf(handles.s, 'C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait); 

这里是代码

function StaticCalibrationBtn_Callback(hObject, eventdata, handles)
    % hObject    handle to StaticCalibrationBtn (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    disp('calibration button hit');
    Start = str2double(get(handles.CalFromUserTxt, 'string')); % Fetches the user inputed start location in mm and converts to double
    disp(Start);
    End = str2double(get(handles.CalToUserTxt, 'string')); % same for End position
    disp(End);
    Increment = get(handles.CalUserIncrementTxt, 'string'); % fetches the increment user inputed data as a string
    disp(Increment);
    Wait = get(handles.CalUserSpeedTxt, 'string'); % fetches the wait inputed data as a string
    disp(Wait);
    StartSteps = round(Start/0.00793750000); % computes the starting step position,double division
    disp(StartSteps);
    handles.StartSteps = StartSteps; % creats a place for the start steps inside the handles structure, to be fetched by anythingelsest be saved with guidata(hObject,handles)
    EndSteps = round(End/0.00793750000); % computes the end step position
    disp(EndSteps);
    handles.EndSteps = EndSteps; % stores the end steps to be accessed by anything else must be saved with guidata(hObject,handles)
    StartStepsStr = num2str(StartSteps); % converts the StartSteps double into a string so it can be sent over serial as a string
    disp(StartStepsStr);
    EndStepsStr = num2str(EndSteps); % converts the EndSteps double into a string so it can be sent over serial as a string
    disp(EndStepsStr);
    OutputString = strcat('C0' , {' '} , StartStepsStr , {' '} , EndStepsStr , {' '} , Increment , {' '} , Wait);
    disp(OutputString);
    fprintf(handles.s, 'C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait);

handles.s 的来源

function SerialBtn_Callback(hObject, eventdata, handles)
% hObject    handle to SerialBtn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA
comPort = get(handles.COMportTxt,'String');
if(~exist('serialFlag','var'))
    [handles.s, handles.serialFlag] = setupSerial(comPort);
end
guidata(hObject,handles);
end

还有setupserial函数

function [ s, flag] = setupSerial(comPort)
%Initialize serial port communication between Arduino and Matlab
%Ensure that the arduino is also communicating with Matlab at this time. 
%if setup is complete then the value of setup is returned as 1 else 0.

flag =1;
s = serial(comPort);
set(s,'DataBits',8);
set(s,'StopBits',1);
set(s,'BaudRate',9600);
set(s,'Parity','none');
fopen(s);
a='b';
while (a~='a')
    a=fread(s,1,'uchar');
end
if (a=='a')
    disp('serial read');
end
fprintf(s,'%c','a');
mbox = msgbox('Serial Communication setup.'); uiwait(mbox);
fscanf(s,'%u');
end

---

使用以下方法解决了问题

OutputString = sprintf('C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait);
fprintf(handles.s,'%s', OutputString);

Answer 1

有多个称为 fprintf 的函数，一个用于文件，一个用于串行对象，还有一些其他的。您正在使用从 fprintf 中知道的文件功能，但您正在将它与串行对象一起使用。检查可以通过doc serial/fprintf访问的正确文档