diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/tools/qbytearray.cpp | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/corelib/tools/qbytearray.cpp b/src/corelib/tools/qbytearray.cpp index 517927a..c572fb1 100644 --- a/src/corelib/tools/qbytearray.cpp +++ b/src/corelib/tools/qbytearray.cpp @@ -903,8 +903,8 @@ QByteArray &QByteArray::operator=(const char *str) The last byte in the byte array is at position size() - 1. In addition, QByteArray ensures that the byte at position size() is always '\\0', so that you can use the return value of data() and - constData() as arguments to functions that expect - '\\0'-terminated strings. + constData() as arguments to functions that expect '\\0'-terminated + strings. Example: \snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 6 @@ -997,7 +997,9 @@ QByteArray &QByteArray::operator=(const char *str) Returns a pointer to the data stored in the byte array. The pointer can be used to access and modify the bytes that compose - the array. The data is '\\0'-terminated. + the array. The data is '\\0'-terminated, i.e. the number of + bytes in the returned character string is size() + 1 for the + '\\0' terminator. Example: \snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 8 @@ -1009,6 +1011,16 @@ QByteArray &QByteArray::operator=(const char *str) This function is mostly useful to pass a byte array to a function that accepts a \c{const char *}. + The following example makes a copy of the char* returned by + data(), but it will corrupt the heap and cause a crash because it + does not allocate a byte for the '\\0' at the end: + + \snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 46 + + This one allocates the correct amount of space: + + \snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 47 + Note: A QByteArray can store any byte values including '\\0's, but most functions that take \c{char *} arguments assume that the data ends at the first '\\0' they encounter. |