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mikumiku 

How to deal with 'BLOB is not a valid UTF-8 string' error

I write a apex class to import csv file from the VF page. The 'BLOB is not a valid UTF-8 string' raising.I don't how to set the csv encode. or is there any way to convert the file to UTF-8 by apex code.

Any suggestion would be appriciate.

Thanks.

Best Answer chosen by Admin (Salesforce Developers) 
AdrianCCAdrianCC

Ok, I'm shooting in the dark but I assume your problem code looks smth like this: 

 

...
Blob csvBlob = csv.Body;
String csvString = csvBlob.toString();
...

 

You can't convert "BINARY" data into a String. A String only supports valid UTF-8 strings. Use EncodingUtil.Base64Encode if you need the binary data in a string you can work with.

 

String csvBody = EncodingUtil.base64Encode(csvBlob);

 Also check to see if your csv doesn't have some weird chars in it, I don't know like chinnese etc

 

EncodingUtil Class

All Answers

AdrianCCAdrianCC

Ok, I'm shooting in the dark but I assume your problem code looks smth like this: 

 

...
Blob csvBlob = csv.Body;
String csvString = csvBlob.toString();
...

 

You can't convert "BINARY" data into a String. A String only supports valid UTF-8 strings. Use EncodingUtil.Base64Encode if you need the binary data in a string you can work with.

 

String csvBody = EncodingUtil.base64Encode(csvBlob);

 Also check to see if your csv doesn't have some weird chars in it, I don't know like chinnese etc

 

EncodingUtil Class

This was selected as the best answer
vanessenvanessen

And if i have special character (french accent) to be written in a file and save as attachment.How do i encode the string , note that attachment body take blob contents ?
vanessenvanessen

Got the answer by myself. In fact to encode an string in apex in UTF-8 to b inserted into a document body, i have done this :

 

Attachement a = new Attachment();

a.body = str;

a.ContentType = 'text/plain; charset=UTF-8';   

a.parent = parentId;

insert a;

Special characters are considere.
AdrianCCAdrianCC

Cool!

I've looked for a solution but I've missed the ContentType. 

 

Great find @vanessen.
shibani_arulshibani_arul

I have created CSV using apex with special character. If I download the CSV file from object it will opened correctly in CSV editor. But it had junk  value in Excel. What is the problem with that. I have changed  utf-8 in Excel also. But Still i have the same problem.

 

 

 

 
mahemahe
I have declared below code and gettting error , How we will resove?

public string nameFile{get; set;}      
public Blob contentFile{get; set;}

nameFile=contentFile.toString();
Naveen KNNaveen KN
this may help 

https://www.codengine.in/2019/06/blob-is-not-a-valid-utf-8-string-salesforce-apex.html
MM SaikumarMM Saikumar
This helps in solving the issue

public static String blobToString(Blob input, String inCharset){
    String hex = EncodingUtil.convertToHex(input);
    System.assertEquals(0, hex.length() & 1);
    final Integer bytesCount = hex.length() >> 1;
    String[] bytes = new String[bytesCount];
    for(Integer i = 0; i < bytesCount; ++i)
        bytes[i] =  hex.mid(i << 1, 2);
    return EncodingUtil.urlDecode('%' + String.join(bytes, '%'), inCharset);
}
Sara Bohne 6Sara Bohne 6
Hi All,
1. make sure you use the CSV (Comma delimited)(*.csv) format ONLY
2. confirm your csv file does not contain any special characters