Qt string to file

Viewed k times. Thanks for your answers. Improve this question. Anon 1, 2 2 gold badges 27 27 silver badges 45 45 bronze badges. Tom83B Tom83B 2, 4 4 gold badges 18 18 silver badges 28 28 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Palmik Palmik 2, 14 14 silver badges 13 13 bronze badges. Sorantis 14k 4 4 gold badges 29 29 silver badges 36 36 bronze badges.

I was indeed in the wrong directory. It was in a different folder than in which the cpp files were. It was in a folder which contained a folder with the. Tom83B That is expected behavior. Just an update to this answer from the QT 4.

The use of other separators e. Source: doc. That and it doesn't actually address the OP's issue, nor is your code any different from theirs If you just open the file and write into it, you start writing at the beginning of the file.

Reply Quote 2 1 Reply Last reply. It works, thank you all a lot :- Reply Quote 1 1 Reply Last reply. Loading More Posts 6 Posts. It is typically used in HTTP for referring to a certain link or point on a page:. Passing an argument of QString a null QString will unset the fragment. Passing an argument of QString "" an empty but not null QString will set the fragment to an empty string as if the original URL had a lone " ".

QUrl::DecodedMode should be used when setting the fragment from a data source which is not a URL or with a fragment obtained by calling fragment with the QUrl::FullyDecoded formatting option. See also fragment and hasFragment. Note that, in all cases, the result of the parsing must be a valid hostname according to STD 3 rules, as modified by the Internationalized Resource Identifiers specification RFC Invalid hostnames are not permitted and will cause isValid to become false.

See also host and setAuthority. Note that if you call this function, you need to do so before you start any threads that might access idnWhitelist. Qt comes with a default list that contains the Internet top-level domains that have published support for Internationalized Domain Names IDNs and rules to guarantee that no deception can happen between similarly-looking characters such as the Latin lowercase letter 'a' and the Cyrillic equivalent, which in most fonts are visually identical.

This function is provided for those who need to manipulate the list, in order to add or remove a TLD. It is not recommended to change its value for purposes other than testing, as it may expose users to security risks. Sets the URL's password to password. The password is part of the user info element in the authority of the URL, as described in setUserInfo.

QUrl::DecodedMode should be used when setting the password from a data source which is not a URL, such as a password dialog shown to the user or with a password obtained by calling password with the QUrl::FullyDecoded formatting option. See also password and setUserInfo.

Sets the path of the URL to path. The path is the part of the URL that comes after the authority but before the query string. For non-hierarchical schemes, the path will be everything following the scheme declaration, as in the following example:. QUrl::DecodedMode should be used when setting the path from a data source which is not a URL, such as a dialog shown to the user or with a path obtained by calling path with the QUrl::FullyDecoded formatting option.

Sets the port of the URL to port. The port is part of the authority of the URL, as described in setAuthority. Setting the port to -1 indicates that the port is unspecified. This function is useful if you need to pass a query string that does not fit into the key-value pattern, or that uses a different scheme for encoding special characters than what is suggested by QUrl. Passing a value of QString to query a null QString unsets the query completely.

However, passing a value of QString "" will set the query to an empty value, as if the original URL had a lone "? Query strings often contain percent-encoded sequences, so use of DecodedMode is discouraged.

See also query and hasQuery. This function does not have parsing parameters because the QUrlQuery contains data that is already parsed. Sets the scheme of the URL to scheme. The scheme describes the type or protocol of the URL. See also scheme and isRelative. Parses url and sets this object to that value. The parsing mode DecodedMode is not permitted in this context and will produce a run-time warning.

See also url and toString. Sets the user info of the URL to userInfo. The user info is an optional part of the authority of the URL, as described in setAuthority. The user info consists of a user name and optionally a password, separated by a ':'. If the password is empty, the colon must be omitted. The following example shows a valid user info string:. To set fully decoded data, call setUserName and setPassword individually.

Sets the URL's user name to userName. QUrl::DecodedMode should be used when setting the user name from a data source which is not a URL, such as a password dialog shown to the user or with a user name obtained by calling userName with the QUrl::FullyDecoded formatting option. See also userName and setUserInfo. This function returns an empty QByteArray if domain is not a valid hostname. Note, in particular, that IPv6 literals are not valid domain names.

Returns a human-displayable string representation of the URL. The option RemovePassword is always enabled, since passwords should never be shown back to users. With the default options, the resulting QString can be passed back to a QUrl later on, but any password that was present initially will be lost.

The host name is encoded using Punycode. Returns the path of this URL formatted as a local file path. The path returned will use forward slashes, even if it was originally created from one with backslashes. See also fromLocalFile and isLocalFile. Returns an encoded copy of input. To prevent characters from being percent encoded pass them to exclude. To force characters to be percent encoded pass them to include. Returns a string representation of the URL.

The option QUrl::FullyDecoded is not permitted in this function since it would generate ambiguous data. See also FormattingOptions , url , and setUrl. Converts a list of urls into a list of QString objects, using toString options. The resulting QString can be passed back to a QUrl later on.

If you need to obtain fully decoded data, call userName and password individually. See also setUserInfo , userName , password , and authority. The returned string consists of the fields from position start to position end inclusive. If end is not specified, all fields from position start to the end of the string are included.

Fields are numbered 0, 1, 2, etc. The flags argument can be used to affect some aspects of the function's behavior, e.

If start or end is negative, we count fields from the right of the string, the right-most field being -1, the one from right-most field being -2, and so on. Warning: Using this QRegExp version is much more expensive than the overloaded string and character versions. See also split and simplified. Warning: Using this QRegularExpression version is much more expensive than the overloaded string and character versions.

Sets the string to the printed value of n in the specified base , and returns a reference to the string. Sets the string to the printed value of n , formatted according to the given format and precision , and returns a reference to the string.

The format can be 'e', 'E', 'f', 'g' or 'G' see Argument Formats for an explanation of the formats. Resets the QString to use the first size Unicode characters in the array unicode. This function can be used instead of fromRawData to re-use existings QString objects to save memory re-allocations. See also unicode and setUtf Note that unlike fromUtf16 , this function does not consider BOMs and possibly differing byte ordering.

See also utf16 and setUnicode. This function is provided for STL compatibility. It is equivalent to squeeze. Returns a string that has whitespace removed from the start and the end, and that has each sequence of internal whitespace replaced with a single space.

Whitespace means any character for which QChar::isSpace returns true. See also isEmpty and resize. Splits the string into substrings wherever sep occurs, and returns the list of those strings. If sep does not match anywhere in the string, split returns a single-element list containing this string. If behavior is Qt::SkipEmptyParts , empty entries don't appear in the result. By default, empty entries are kept.

If sep is empty, split returns an empty string, followed by each of the string's characters, followed by another empty string:. To understand this behavior, recall that the empty string matches everywhere, so the above is qualitatively the same as:. See also QStringList::join and section. Splits the string into substrings wherever the regular expression rx matches, and returns the list of those strings.

If rx does not match anywhere in the string, split returns a single-element list containing this string. Here is an example where we extract the words in a sentence using one or more whitespace characters as the separator:. Here is a similar example, but this time we use any sequence of non-word characters as the separator:.

Splits the string into substrings wherever the regular expression re matches, and returns the list of those strings. If re does not match anywhere in the string, split returns a single-element list containing this string. Splits the string into substring references wherever sep occurs, and returns the list of those strings.

See QString::split for how sep , behavior and cs interact to form the result. Note: All references are valid as long this string is alive. Destroying this string will cause all references to be dangling pointers.

See also QStringRef and split. Splits the string into substring references wherever the regular expression rx matches, and returns the list of those strings. If rx does not match anywhere in the string, splitRef returns a single-element vector containing this string reference. Splits the string into substring references wherever the regular expression re matches, and returns the list of those strings. If re does not match anywhere in the string, splitRef returns a single-element vector containing this string reference.

See also split and QStringRef. See also reserve and capacity. Returns true if the string starts with s ; otherwise returns false.

Returns true if the string starts with the string reference s ; otherwise returns false. Returns true if the string starts with the string-view str ; otherwise returns false. If cs is Qt::CaseSensitive default , the search is case-sensitive; otherwise the search is case insensitive. Returns true if the string starts with c ; otherwise returns false.

The caller owns the CFString and is responsible for releasing it. Returns the case folded equivalent of the string. For most Unicode characters this is the same as toLower.

Returns an infinity if the conversion overflows or 0. Including the unit or additional characters leads to a conversion error.

The string conversion will always happen in the 'C' locale. For locale dependent conversion use QLocale::toDouble. For historical reasons, this function does not handle thousands group separators. If you need to convert such numbers, use QLocale::toDouble. For locale dependent conversion use QLocale::toFloat.

If you need to convert such numbers, use QLocale::toFloat. Returns the string converted to an int using base base , which is 10 by default and must be between 2 and 36, or 0. Returns 0 if the conversion fails. If base is 0, the C language convention is used: If the string begins with "0x", base 16 is used; if the string begins with "0", base 8 is used; otherwise, base 10 is used.

For locale dependent conversion use QLocale::toInt. The returned byte array is undefined if the string contains non-Latin1 characters. Those characters may be suppressed or replaced with a question mark. Returns the local 8-bit representation of the string as a QByteArray. The returned byte array is undefined if the string contains characters not supported by the local 8-bit encoding.

If the locale encoding could not be determined, this function does the same as toLatin1. If this string contains any characters that cannot be encoded in the locale, the returned byte array is undefined. Those characters may be suppressed or replaced by another. Returns the string converted to a long using base base , which is 10 by default and must be between 2 and 36, or 0.

For locale dependent conversion use QLocale::toLongLong. Returns the string converted to a long long using base base , which is 10 by default and must be between 2 and 36, or 0.

The case conversion will always happen in the 'C' locale. For locale dependent case folding use QLocale::toLower. See also toUpper and QLocale::toLower. Returns the string converted to a short using base base , which is 10 by default and must be between 2 and 36, or 0. For locale dependent conversion use QLocale::toShort.

Returns a std::string object with the data contained in this QString. The Unicode data is converted into 8-bit characters using the toUtf8 function. This method is mostly useful to pass a QString to a function that accepts a std::string object. Returns a std::u16string object with the data contained in this QString. The Unicode data is the same as returned by the utf16 method. Returns a std::u32string object with the data contained in this QString.

The Unicode data is the same as returned by the toUcs4 method. Returns a std::wstring object with the data contained in this QString.

This method is mostly useful to pass a QString to a function that accepts a std::wstring object. Returns the string converted to an unsigned int using base base , which is 10 by default and must be between 2 and 36, or 0.

For locale dependent conversion use QLocale::toUInt. Returns the string converted to an unsigned long using base base , which is 10 by default and must be between 2 and 36, or 0. See also number and QLocale::toUInt. Returns the string converted to an unsigned long long using base base , which is 10 by default and must be between 2 and 36, or 0.

Returns the string converted to an unsigned short using base base , which is 10 by default and must be between 2 and 36, or 0. For locale dependent conversion use QLocale::toUShort.

UCS-4 is a Unicode codec and therefore it is lossless. All characters from this string will be encoded in UCS For locale dependent case folding use QLocale::toUpper. See also toLower and QLocale::toLower. Fills the array with the data contained in this QString object.

Unlike simplified , trimmed leaves internal whitespace alone. See also chop , resize , left , and QStringRef::truncate. Returns a Unicode representation of the string. The result remains valid until the string is modified. See also setUnicode , utf16 , and fromRawData. See also setUtf16 and unicode. See the asprintf documentation for an explanation of cformat. Returns true if this string is not equal to parameter string other.

Otherwise returns false. The other const char pointer is converted to a QString using the fromUtf8 function.

The other byte array is converted to a QString using the fromUtf8 function. Appends the string other onto the end of this string and returns a reference to this string. This operation is typically very fast constant time , because QString preallocates extra space at the end of the string data so it can grow without reallocating the entire string each time.

See also append and prepend. Appends the character ch to this string. Note that the character is converted to Unicode using the fromLatin1 function, unlike other 8-bit functions that operate on UTF-8 data.

Returns true if this string is lexically less than the parameter string called other ; otherwise returns false. Returns true if this string is lexically less than string other.

Returns true if this string is lexically less than or equal to parameter string other. Assigns str to this string. Assigns character ch to this string. Returns true if this string is equal to other ; otherwise returns false.

This function stops conversion at the first NUL character found, or the end of the byte array. Returns true if this string is lexically equal to the parameter string other. Returns true if this string is lexically greater than the parameter string other ; otherwise returns false. Returns true if this string is lexically greater than or equal to parameter string other.

If you assign to it, the assignment will apply to the character in the QString from which you got the reference. Note: Before Qt 5.

Furthermore, assigning a value to the returned QCharRef would cause a detach of the string, even if the string has been copied in the meanwhile and the QCharRef kept alive while the copy was taken.

These behaviors are deprecated, and will be changed in a future version of Qt. Returns true if string s1 is not equal to string s2 ; otherwise returns false. Returns true if s1 is not equal to s2 ; otherwise returns false. For s1!