How to change string into QString?

If by string you mean std::string you can do it with this method:

QString QString::fromStdString(const std::string & str)

std::string str = "Hello world";
QString qstr = QString::fromStdString(str);

If by string you mean Ascii encoded const char * then you can use this method:

QString QString::fromAscii(const char * str, int size = -1)

const char* str = "Hello world";
QString qstr = QString::fromAscii(str);

If you have const char * encoded with system encoding that can be read with QTextCodec::codecForLocale() then you should use this method:

QString QString::fromLocal8Bit(const char * str, int size = -1)

const char* str = "zażółć gęślą jaźń";      // latin2 source file and system encoding
QString qstr = QString::fromLocal8Bit(str);

If you have const char * that’s UTF8 encoded then you’ll need to use this method:

QString QString::fromUtf8(const char * str, int size = -1)

const char* str = read_raw("hello.txt"); // assuming hello.txt is UTF8 encoded, and read_raw() reads bytes from file into memory and returns pointer to the first byte as const char*
QString qstr = QString::fromUtf8(str);

There’s also method for const ushort * containing UTF16 encoded string:

QString QString::fromUtf16(const ushort * unicode, int size = -1)

const ushort* str = read_raw("hello.txt"); // assuming hello.txt is UTF16 encoded, and read_raw() reads bytes from file into memory and returns pointer to the first byte as const ushort*
QString qstr = QString::fromUtf16(str);

Related Posts:

  1. How to convert QString to int?
  2. QByteArray to QString
  3. Why the switch statement cannot be applied on strings?
  4. How to convert string to char array in C++?
  5. How can I convert a std::string to int?
  6. Easiest way to convert int to string in C++
  7. std::string to char*
  8. How to convert string to char array in C++?
  9. C++ — expected primary-expression before ‘ ‘
  10. C++ string to double conversion
  11. Conversion from string to char – c++
  12. What is `CString`?
  13. How do I include the string header?
  14. Differences between C++ string == and compare()?
  15. How to convert a char array to a string?
  16. How do I convert a double into a string in C++?
  17. Split a string using C++11
  18. How to convert an instance of std::string to lower case
  19. Check if a string contains a string in C++
  20. How do I iterate over the words of a string?
  21. Returning an empty string : efficient way in c++
  22. Replace part of a string with another string
  23. C++ string to double conversion
  24. What is use of c_str function In c++
  25. How to reverse an std::string? [duplicate]
  26. Windows 7 exception code: 0xc0000409
  27. C++ Parsing input string to variables
  28. std::string to char*
  29. “Symbol(s) not found for architecture x86_64” on QtCreator project
  30. How to convert a std::string to const char* or char*
  31. How do I tokenize a string in C++?
  32. Why use string::iterator rather than index?
  33. Why am I getting string does not name a type Error?
  34. C++ deprecated conversion from string constant to ‘char*’
  35. identifier “string” undefined?
  36. Press Enter to Continue
  37. Converting a vector to string
  38. Parsing a comma-delimited std::string
  39. How can I convert const char* to string and then back to char*?
  40. std::string formatting like sprintf
  41. Sorting Characters Of A C++ String
  42. basic_string::_M_construct null not valid after constructing subvector of strings
  43. How to copy a string of std::string type in C++?
  44. How to return a string from a C++ function?
  45. std::out_of_range error?
  46. printf with std::string?
  47. Convert a String In C++ To Upper Case
  48. Right way to split an std::string into a vector
  49. Read whole ASCII file into C++ std::string
  50. C++: std does not have member “string”
  51. Right way to split an std::string into a vector
  52. string subscript out of range error
  53. Returning an empty string : efficient way in c++
  54. Split a string into an array in C++
  55. splitting a string into an array in C++ without using vector
  56. Remove spaces from std::string in C++
  57. Remove spaces from std::string in C++
  58. How can I iterate through a string and also know the index (current position)?
  59. c++ parse int from string [duplicate]
  60. Hash function for a string
  61. C++ strings and pointers
  62. How to Convert a C++ String to Uppercase
  63. std::wstring VS std::string
  64. C++ Simple hangman game
  65. std::cin input with spaces?
  66. Remove First and Last Character C++
  67. Error: C2228: left of ” must have class/struct/union
  68. C++ Remove punctuation from String
  69. C++ string to enum
  70. C++ Convert string (or char*) to wstring (or wchar_t*)
  71. C++ – Assigning null to a std::string
  72. How to alphabetically sort strings?
  73. Hash function for a string
  74. Reading string by char till end of line C/C++
  75. How do I check if a C++ std::string starts with a certain string, and convert a substring to an int?
  76. Dynamically allocated string array, then change it’s value?
  77. Fastest way to Convert String to Binary?
  78. Why I cannot cout a string?
  79. std::string length() and size() member functions
  80. Which is faster C++ String length() or size()?
  81. Is string::compare reliable to determine alphabetical order?
  82. Trying to use int in getline
  83. Error “Unterminated conditional directive” in cross-referencing headers
  84. error: switch quantity not an integer
  85. Reading a string from file c++
  86. Function stoi not declared
  87. Converting String to Cstring in C++
  88. c++ sizeof( string )
  89. How to do std::string indexof in C++ that returns index of matching string?
  90. variable or field declared void
  91. Function stoi not declared
  92. Understanding error “terminate called after throwing an instance of ‘std::length_error’ what(): basic_string::_S_create Aborted (core dumped)”
  93. convert string to size_t
  94. enum to string in modern C++11 / C++14 / C++17 and future C++20
  95. Converting bool to text in C++
  96. Why are there two different getline() functions (if indeed there are)?
  97. Why does my program give “NULL used in arithmetic”
  98. How to find and replace string?
  99. Declaration is incompatible with type
  100. I’m getting the error “stoi is not a member of std” in myprogramminglab [duplicate]

Leave a Comment