No file found, when the folder has been found and the file is listed in it

Question

Nick Aggelopoulos 2020-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/562385-no-file-found-when-the-folder-has-been-found-and-the-file-is-listed-in-it

评论： Nick Aggelopoulos 2020-7-16

Matlab01.jpg

I would be grateful for any suggestions. As the screenshot shows, Matlab has found the folder with the file, it has correctly calculated the file name with the correct suffix, the file name is listed within the folder in the Current Folder window, but an error is instead reported that the file cannot be found.

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madhan ravi 2020-7-9

It might help to see your code from the function file.

Nick Aggelopoulos 2020-7-9

I have added the entire script under Star Strider's response

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Answer 1

Star Strider 2020-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/562385-no-file-found-when-the-folder-has-been-found-and-the-file-is-listed-in-it#answer_463628

We cannot see the rest of the function that you are using to read the files (that you apparently wrote, and does not produce any outputs).

Check to see if the logic inside that function is correct. It could be that it is returning the error message when the file itself has been found and read (since no red MATLAB errors apparently appear), and the logic writes the error message in spite of that.

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Nick Aggelopoulos 2020-7-9

在 MATLAB Online 中打开

function []=GetMCData(DateName,Nr)
% clear all
% close all
tic
MeaRecording=false;
%original file and folder
fileNam=[ DateName '_' int2str(Nr) '_'];% Date Name of MCD files
%  McdDatDir='H:\';% location of MCD files
McdDatDir='X:\UBZA500\Aggelopoulos\00_RecordedEPhysData_MCSfiles';
% McdDatDir='Y:\Dehmel\00_RecordedEPhysData_MCSfiles\';
% McdDatDir='D:\';
 McdDatDep= 'X:\UBZA500\Aggelopoulos\01_RecordedEPhysData_MATLABfiles';% location for MAT files
 McdMatDir='X:\UBZA500\Aggelopoulos\programs MATLAB_old'; % MC_DataTool location
%  McdMatDir='C:\Program Files (x86)\Multi Channel Systems\MC_DataTool\';
TFile='Temp.raw';
% Data to be used (digital go first)
if ~MeaRecording
    ttl_digitalChannel_bit='D1:0';
    used_analogChannel=1:31;
else
    ttl_analogChannel='A2';
    used_analogChannel=[12:17 21:28 31:38 41:48 51:58 61:68 71:78 82:87];
end
HdTest=false;
while ~HdTest
%check if there is a correponding temp file 
if exist( TFile,'file')==2
 fid=fopen(TFile, 'r');
 infoHeadr=char(fread(fid,11,'char')');
 HdTest=strcmp(infoHeadr,'MC_DataTool');
 if HdTest
   pif=11;
   while and(~feof(fid),~strcmp(infoHeadr(pif+(-2:0)),'EOH'))
    infoHeadr=[infoHeadr char(fread(fid,1,'char'))];  
     pif=pif+1;
   end
   
% extract and check infos in the header  
  po=strfind(infoHeadr,'MC_REC file = "')+15;
  pe=po;
   while infoHeadr(pe)~='"'
      pe=pe+1;
   end
   pe=pe-1;
  HdFileName=infoHeadr(po:pe);
  HdTest=~isempty(strfind( HdFileName,fileNam));
  
 po=strfind(infoHeadr,'Sample rate = ')+14;
  pe=po;
   while infoHeadr(pe)~=char(13)
      pe=pe+1;
   end
   pe=pe-1;    
  SamplingRate=str2double(infoHeadr(po:pe));
  
  po=strfind(infoHeadr,'ADC zero = ')+11;
  pe=po;
   while infoHeadr(pe)~=char(13)
      pe=pe+1;
   end
   pe=pe-1;    
  ADCzero=str2double(infoHeadr(po:pe));
  
  po=strfind(infoHeadr,'Fi = ')+5;
  pe=po;
   while infoHeadr(pe)~='µ'
      pe=pe+1;
   end
   pe=pe-1;    
  uV2AD=str2double(infoHeadr(po:pe));
    
 end
 fclose(fid);
else
HdTest=false;
end
    
if ~HdTest
% get the Recorded MCD data in to a raw file  
% check for multiple files
McdDirContent=dir([McdDatDir '*.mcd']);
nSplit=[];
 for la=1:numel(McdDirContent)
    if strfind(McdDirContent(la).name,fileNam)==1
        nSplit=[nSplit la];
    end
 end
 if isempty(nSplit)
    disp([' no file ' fileNam '.mcd in  folder ' McdDatDir ]);
    break
 else
    % command line genration starts here
    genCommandStr=['MC_DataTool.com -bin '];
    % add splitted files
    for la=1:numel(nSplit)
    genCommandStr=[ genCommandStr '-i ' McdDatDir McdDirContent(nSplit(la)).name ' '];
    end
    % create Temp.raw file in right folder
    BinDatDir=McdMatDir;
    %add output location and file
    genCommandStr=[ genCommandStr '-o ' BinDatDir TFile ' -WriteHeader -ToUnsigned '];
    if numel(nSplit)>1
     genCommandStr=[ genCommandStr '-AssumeSplittedFile -SingleOutfile '];
    end
   
    if ~MeaRecording
     % digital channels Susel
     genCommandStr=[ genCommandStr '-s Di:' ttl_digitalChannel_bit ' '];
    else
     % digital channels Mea
     genCommandStr=[ genCommandStr '-s "Analog Raw Data:' ttl_analogChannel '" '];
    end
    GenChStr=[];            
    for nCh=1:numel(used_analogChannel)
       if ~MeaRecording 
           GenChStr=[GenChStr '-s "Filtered Data 2:' num2str(used_analogChannel(nCh),'%02.2d') '" ']; 
       else
           GenChStr=[GenChStr '-s "Filtered Data 1:' num2str(used_analogChannel(nCh),'%02.2d') '" ']; 
      
       end
       % GenChStr=[GenChStr '-s Fi:' num2str(used_analogChannel(nCh),'%02.2d') ' ']; 
    end
    genCommandStr=[genCommandStr GenChStr];
    [ant resu] = system([McdMatDir genCommandStr],'-echo');
    
 end
end
end
if HdTest
% at this point we should be able to read the raw file data and create
% a Matlab data structure
% recorded analog data will be transferd to single presition values in Volts
% trigger data will stored as boolean vector 
    MultiChannelData.orgFileName=HdFileName;
    MultiChannelData.SamplingRate=SamplingRate;
    MultiChannelData.DataChannelNo=1+numel(used_analogChannel);% digital+analog
    MultiChannelData.DataChannel=used_analogChannel;
    % since every thing comes in uint16 we just have to read it like that
    % from the raw-file
    fid=fopen(TFile, 'r');
    fseek(fid,0,'eof');
    lastbyte=ftell(fid);
    takejust=floor((lastbyte-(pif+2))/(2*MultiChannelData.DataChannelNo));
    disp([ int2str(takejust/MultiChannelData.SamplingRate) ' sec of data'])
    % calculate the memory to be used for this
    % unfortunately fread first consumes the space for doubles
      
    usemem=memory;
    
    if usemem.MemAvailableAllArrays< (2*(lastbyte-(pif+2)))
     disp(' Not enough memory to handle this file! Increase at least virtual memory ');
     return
    else
     fseek(fid,pif+2,'bof');   
     if usemem.MemAvailableAllArrays< (4*(lastbyte-(pif+2)))
    %now start after header and read the data
      
        DatChan=fread(fid,(lastbyte-(pif+2)),'uint16');
        fclose(fid);
        DatChan=single(reshape(DatChan(1:(MultiChannelData.DataChannelNo*takejust))',[MultiChannelData.DataChannelNo takejust]));
     else
         % for simplicity we split in to 9parts
         totalData=(lastbyte-(pif+2));
         partData=floor((lastbyte-(pif+2))/8);
         DatChan=[];
          for pieces=1:8 
           DatPart=fread(fid,partData,'uint16');  
           DatChan=[DatChan; uint16(DatPart)];
          end
        DatPart=fread(fid,totalData-8*partData,'uint16');  
        DatChan=[DatChan uint16(DatPart)];
        clear DatPart;
        fclose(fid);
        DatChan=single(reshape(DatChan(1:(MultiChannelData.DataChannelNo*takejust))',[MultiChannelData.DataChannelNo takejust]));
         
     end
    end
    if ~MeaRecording
        TTL=find(mod(DatChan(1,:),2)==1)/MultiChannelData.SamplingRate;
    else
        lowT=min(DatChan(1,:));
        highT=max(DatChan(1,:));
        tt=(lowT+highT)/2;
        TTL=find(DatChan(1,:)>(highT-0.5))/MultiChannelData.SamplingRate;
    end
    TTL=TTL(diff([0 TTL])>0.002);% 2 ms dead time
    MultiChannelData.TTL=TTL;
    MultiChannelData.Analog=(DatChan(2:end,:)-ADCzero)*uV2AD;
    disp('saving data - please wait');
    save([McdDatDep fileNam '.mat'],'MultiChannelData','-v7.3');
    disp('done');
end
toc

Star Strider 2020-7-9

在 MATLAB Online 中打开

I obviously cannot test your code. However, note that from the strfind documentation:

‘k = strfind(str,pattern) searches str for occurrences of pattern. The output, k, indicates the starting index of each occurrence of pattern in str. ’

so (at least as I read it) unless the starting index is 1, This will fail:

strfind(McdDirContent(la).name,fileNam)==1

and ‘nSplit’ will be empty.

Perhaps this would work:

any(strfind(McdDirContent(la).name,fileNam))

As I mentioned, I cannot test this, so you will have to experiment to see if this is actually the problem, and determine what logic works.

It also might be interesting to have your function return something to see if it is doing what you want it to do.

.

Nick Aggelopoulos 2020-7-16

Thanks for your feedback. Just in case this helps anyone, there was a security issue with one of the files or file locations, so that the file could be read but not written into another location. Consequently, the header could not be read by Matlab, hence the program confusingly stated that the original file did not exist.

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No file found, when the folder has been found and the file is listed in it

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No file found, when the folder has been found and the file is listed in it

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