Hi is there away to detect the length of a byte before I get the error message:
Length cannot be less than zero. Parameter name: length
I get the error on this line:
new_username = new_username.Substring(0, new_username.IndexOf(" Joined "))
I am removing the "joined" from the string I get....how can I ignore it is "joined" isnt the the data?
Thanks
I would test to see what IndexOf returned before using it in this context:
if(new_username.IndexOf(" Joined") > 0)
{
new_username = new_username.Substring(0, new_username.IndexOf(" Joined "))
}
Try this:
new_username = new_Username.Replace(" Joined ", "")
Be warned that this will remove all occurrences of the "Joined" substring rather than just the first.
It looks like new_username.IndexOf(" Joined ") is returning -1 meaning the string " Joined" was not found by Substring. I would break this out into two statements:
The error you are seeing is that you are effectively making this call:
new_username = new_username.Substring(0, -1)
Related
I have declared 2 variables to read from console but on other case i want to read just one of them but i can't.
My code:
print("Enter two numbers in format: {source base} {target base} (To quit type /exit) ")
val (sourceBase, targetBase) = readLine()!!.split(" ")
`I can't type /exit because i've got IndexOutOfBoundsException.
Any tips?
Edit: Thank you all for respond, especially lukas.j, it's working now.
Add a second element, an empty string, if the splitted readLine() contains less than 2 elements:
val (sourceBase, targetBase) = readLine()!!.split(" ").let { if (it.size < 2) it + "" else it }
It kinda works, but the problem is that it seems that the MIME_PART structure is not initialized ? all it's properties has the same values, even if I try to open a different mime item.
MIME_PART *pMime;
DHANDLE hPart;
char *pText;
WORD textLen;
if (error = NSFMimePartGetPart(bidLinksItem, &hPart)) {
goto exit;
}
pMime = OSLock(MIME_PART, hPart);
textLen = (pMime->wByteCount) - pMime->wHeadersLen - pMime->wBoundaryLen;
pText = (char *)pMime + sizeof(MIME_PART) + wHeadersLen;
char *itemText = (char *)malloc(textLen);
memcpy(itemText, pText, textLen);
itemText[textLen] = '\0';
OSUnlock(hPart);
The itemText string has most of the content, but since the MIME_PART structure is not properly set, the pointer to the text is off...
So how do I properly set the MIME_PART?
Your code should do something like this instead:
DHANDLE hPart;
char *pchPart;
if (error = NSFMimePartGetPart(bidLinksItem, &hPart)) {
goto exit;
}
pchPart = OSLock(char, hPart);
In other words, lock the handle as type char instead of type MIME_PART. At this point, pchPart points to the beginning of the raw part data -- starting with a boundary (if present) and the headers. You can use NSFMimePartGetInfoByBLOCKID to get the length of the boundary and headers.
I realize this contradicts the documentation, but I've confirmed with a subject matter expert: The documentation is wrong.
Wrong answer, but the comments may be useful. My other answer is more correct.
This question could be improved. For example, you could show some sample data and describe the results when you try to read that data with your code.
But I'll try to answer based on the information I have. You calculated the text length like this:
textLen = (pMime->wByteCount) - pMime->wHeadersLen - pMime->wBoundaryLen;
That looks right to me, but then you do this:
pText = (char *)pMime + sizeof(MIME_PART) + wHeadersLen;
Is wHeadersLen guaranteed to be equal to pMime->wHeadersLen? Also, you didn't consider the boundary length. Shouldn't you calculate the address like this instead?
pText = (char *)pMime + sizeof(MIME_PART) + pMime->wHeadersLen + pMime->wBoundaryLen;
I am using sql.firstRow to check if a row exists in the postgres database based on some criteria.
def cur = sql.firstRow(r, '''
SELECT "some_thing"
FROM "my_table"
WHERE "customer_name" = :customer_name
AND "sad_date" = :sad_date
AND "forgiver" = :forgiver
''')
I find that this works:
if (cur){
log.debug("Found Some thing " + cur["some_thing"])
log.debug("Cur: " + cur.keySet())
}
however this lets in any rows that don't have some_field inside it.
ISSUE
To avoid this, when we try and check for the existance of a non empty value for some_field on the result row like this:
if (cur && "${cur.some_thing}" ){
log.debug("Found Some thing " + cur["some_thing"])
}
ERROR
I get an error suggesting that:
No signature of `String.positive` for argument types for the given type.
I have read this question and changed from cur.some_thing and cur['some_thing'] to "${cur.some_thing}" but the error does not go away
I have also tried this post and tried to use cur.getProperty("some_thing") and it still throws the same error.
Is there a built-in function to extract all characters in a string up until the first occurrence of a space?
Say the string is:
Methicillin-resistant staphylococcus aureus
I want to be able to get the substring:
Methicillin-resistant
You can do it in two functions:
newstring = mystring.Substring(0, mystring.IndexOf(" "))
Although that will fail if there's no space in mystring.
So you could pull out mystring.IndexOf(" ") into a variable and check whether it's -1 (no space found) before you try to use it in Substring.
The first solution you can use is a simple IndexOf
string GetFirstWord(string source)
{
int index = source.IndexOf(" ");
if (index == -1) return source;
else return source.Substring(0, index);
}
The second solution can be used if you want to keep all words into a string array.
string[] GetWords(string source)
{
return source.Split(' ');
}
if you only want the first word, you can use it like this :
string word = GetWords("Methicillin-resistant staphylococcus aureus")[0];
And a VB.NET solution. No, it can't be done with one built-in method; you need two:
Left(myString, InStr(myString, " ") - 1)
And like the other solutions you need to check InStr doesn't return 0 if myString may not contain a space.
I need to filter out characters like /?-^%{}[];$=*`#|&#'\"<>()+,\. I need replace this with empty string if it is there in the query string. Please help me out. I am using this in ASP pages.
Best idea would be to use a function something along the lines of:
Public Function MakeSQLSafe(ByVal sql As String) As String
'first i'd avoid putting quote chars in as they might be valid? just double them up.
Dim strIllegalChars As String = "/?-^%{}[];$=*`#|&#\<>()+,\"
'replace single quotes with double so they don't cause escape character
If sql.Contains("'") Then
sql = sql.Replace("'", "''")
End If
'need to double up double quotes from what I remember to get them through
If sql.Contains("""") Then
sql = sql.Replace("""", """""")
End If
'remove illegal chars
For Each c As Char In strIllegalChars
If sql.Contains(c.ToString) Then
sql = sql.Replace(c.ToString, "")
End If
Next
Return sql
End Function
This hasn't been tested and it could probably be made more efficient, but it should get you going. Wherever you execute your sql in your app, just wrap the sql in this function to clean the string before execution:
ExecuteSQL(MakeSQLSafe(strSQL))
Hope that helps
As with any string sanitisation, you're much better off working with a whitelist that dictates which characters are allowed, rather than a blacklist of characters that aren't.
This question about filtering HTML tags resulted in an accepted answer suggesting the use of a regular expression to match against a whitelist: How do I filter all HTML tags except a certain whitelist? - I suggest you do something very similar.
I'm using URL Routing and I found this works well, pass each part of your URL to this function. It's more than you need as it converts characters like "&" to "and", but you can modify it to suit:
public static string CleanUrl(this string urlpart) {
// convert accented characters to regular ones
string cleaned = urlpart.Trim().anglicized();
// do some pretty conversions
cleaned = Regex.Replace(cleaned, " ", "-");
cleaned = Regex.Replace(cleaned, "#", "no.");
cleaned = Regex.Replace(cleaned, "&", "and");
cleaned = Regex.Replace(cleaned, "%", "percent");
cleaned = Regex.Replace(cleaned, "#", "at");
// strip all illegal characters like punctuation
cleaned = Regex.Replace(cleaned, "[^A-Za-z0-9- ]", "");
// convert spaces to dashes
cleaned = Regex.Replace(cleaned, " +", "-");
// If we're left with nothing after everything is stripped and cleaned
if (cleaned.Length == 0)
cleaned = "no-description";
// return lowercased string
return cleaned.ToLower();
}
// Convert accented characters to standardized ones
private static string anglicized(this string urlpart) {
string beforeConversion = "àÀâÂäÄáÁéÉèÈêÊëËìÌîÎïÏòÒôÔöÖùÙûÛüÜçÇ’ñ";
string afterConversion = "aAaAaAaAeEeEeEeEiIiIiIoOoOoOuUuUuUcC'n";
string cleaned = urlpart;
for (int i = 0; i < beforeConversion.Length; i++) {
cleaned = Regex.Replace(urlpart, afterConversion[i].ToString(), afterConversion[i].ToString());
}
return cleaned;
// Spanish : ÁÉÍÑÓÚÜ¡¿áéíñóúü"
}