The qstring class provides a unicode character string qstring stores a string of 16bit qchars, where each qchar corresponds one unicode 4. So its got a few things that are only possible with qtextcodec and could slow down the conversion. Qstring stores a string of 16bit qchars, where each qchar corresponds to one utf16 code unit. Normally you would use the utf8 codec to convert a unicode string between a qbytearray and a qstring. Qt converting qstring to unicode qbytearray stack overflow. In addition to qbytearray, qt also provides the qstring class to store string data. Converts the unicode string str into an encoded qbytearray. Unicode is an international standard that supports most of the writing systems in use today. I have 8 bytes data in qstring format i am reading it from txt file. Utf16 as the native encoding for unicode on windows. Qbytearray can be used to store both raw bytes including \0s and traditional 8bit \0terminated strings. Converting between 8bit strings and unicode strings. Convert qstring into qbytearray as either utf8 or latin1.
It happened because the page i was trying to download contains unicode characters. Developmenttutorialslocalizationunicode kde techbase. The \ff\fe at the beginning is the unicode byte order mark for utf16, littleendian. I have a qbytearray which contains bytes in utf16 format. Unicode characters with code values above 65535 are stored using surrogate pairs, i. It stores 16bit unicode characters, making it easy to store nonasciinonlatin1 characters in your application. Unicode is the standard for encoding text in almost all languages spoken in the. Im not sure how to get the qtextcodec to ommit that but if you want to get a qbytearray from a string in utf16 without the bom you could try this.
For instance, even the basic qstring class provides unicode support, implicit sharing as well as a quite pleasant programmers interface to text strings. I have created an encryptdecrypt program, when encrypting i store the encrypted qbytearray in a text file. A python string object may be used whenever a qbytearray is expected. Qbytearray append qstring uses toascii on the string, which again uses the codec for c strings, otherwise converts to latin1. What i mean is if the file gave me an encrypted value of 1234 and i converted. Unlike a qstring, a qbytearray has no encoding information and makes no attempt to decode bytes into characters. Qt client willsend the strings in utf16 encoded format. See also tolatin1, tolocal8bit, qtextcodec, and qconverttoutf8. But when i requested data with qnetworkaccessmanager, i got the reply text like this one. Qts powerful and complex data types are one of the large assets available to all developers using qt. The qstring class provides a unicode character string. Unicode compliant text segmentation qtextboundaryfinder unicode compliant line breaking and text rendering. If the qstring contains nonascii unicode characters, using this function can lead to loss of information. When trying to decrypt i retrieved it and then put it into the decryption method, the problem is that i need a way to convert it to qbytearray without changing the format, otherwise it will not decrypt properly.
Converting utf16 qbytearray to qstring stack overflow. Furthermore, qstring is used throughout in the qt api. So i needed to convert the reply texts into unicode so that i. For most purposes, qstring is the class you want to use. You can rate examples to help us improve the quality of examples. Qbytearray, fromunicodeconst qchar input, int number. Because qstring uses 16bit unicode internally, you can use the constdata and unicode member functions and cast the const qchar return. Utf8 is a unicode codec and can represent all characters in a unicode string like qstring. This is the complete list of members for qstring, including inherited members. A string class, qstring, that stores unicode characters, with support for migrating from c strings including fast translation to and from utf8, iso88591 and usascii, and all the usual string operations.
To convert a qbytearray to qstring, one needs to specify the encoding. It is, however, a good idea to use qbytearray when you need to store raw binary data, and when memory conservation is critical for example, with qt for. Qstring provides the following three functions that return a const char version of the string as qbytearray. For most purposes, qstring is the most appropriate class to use. The first thing that i realised when looking at the qstringfromutf8 code is that it calls out to the same code that is used by qtextcodec.