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The <QtGlobal> header file provides basic declarations and is included by all other Qt headers. More...
The <QtGlobal> header file provides basic declarations and is included by all other Qt headers.
See also <QtAlgorithms>.
Typedef for signed char. This type is guaranteed to be 8-bit on all platforms supported by Qt.
Typedef for signed short. This type is guaranteed to be 16-bit on all platforms supported by Qt.
Typedef for signed int. This type is guaranteed to be 32-bit on all platforms supported by Qt.
Typedef for long long int (__int64 on Windows). This type is guaranteed to be 64-bit on all platforms supported by Qt.
Literals of that type can be created using the Q_INT64_C() macro:
qint64 value = Q_INT64_C(932838457459459);
See also Q_INT64_C() and quint64.
Typedef for long long int (__int64 on Windows). This is the same as qint64.
See also Q_INT64_C() and qulonglong.
Typedef for double.
Typedef for unsigned char. This type is guaranteed to be 8-bit on all platforms supported by Qt.
Typedef for unsigned short. This type is guaranteed to be 16-bit on all platforms supported by Qt.
Typedef for unsigned int. This type is guaranteed to be 32-bit on all platforms supported by Qt.
Typedef for unsigned long long int (unsigned __int64 on Windows). This type is guaranteed to be 64-bit on all platforms supported by Qt.
Literals of that type can be created using the Q_UINT64_C() macro:
quint64 value = Q_UINT64_C(932838457459459);
See also Q_UINT64_C() and qint64.
Typedef for unsigned long long int (unsigned __int64 on Windows). This is the same as quint64.
See also Q_UINT64_C() and qlonglong.
Convenience typedef for unsigned char.
Convenience typedef for unsigned int.
Convenience typedef for unsigned long.
Convenience typedef for unsigned short.
Returns the absolute value of value.
Returns value bounded by min and max. This is equivalent to qMax(min, qMin(value, max)).
Calls the message handler with the critical message msg. If no message handler has been installed, the message is printed to stderr. Under Windows, the message is sent to the debugger.
This function takes a format string and a list of arguments, similar to the C printf() function.
Example:
void load(const QString &fileName) { QFile file(fileName); if (!file.exists()) qCritical("File '%s' does not exist!", qPrintable(fileName)); }
Warning: The internal buffer is limited to 8192 bytes, including the '\0'-terminator.
Warning: Passing (const char *)0 as argument to qCritical might lead to crashes on certain platforms due to the platforms printf implementation.
See also qDebug(), qWarning(), qFatal(), qInstallMsgHandler(), and Debugging Techniques.
Calls the message handler with the debug message msg. If no message handler has been installed, the message is printed to stderr. Under Windows, the message is sent to the debugger. This function does nothing if QT_NO_DEBUG_OUTPUT was defined during compilation.
If you pass the function a format string and a list of arguments, it works in similar way to the C printf() function.
Example:
qDebug("Items in list: %d", myList.size());
If you include <QtDebug>, a more convenient syntax is also available:
qDebug() << "Brush:" << myQBrush << "Other value:" << i;
This syntax automatically puts a single space between each item, and outputs a newline at the end. It supports many C++ and Qt types.
Warning: The internal buffer is limited to 8192 bytes, including the '\0'-terminator.
Warning: Passing (const char *)0 as argument to qDebug might lead to crashes on certain platforms due to the platform's printf() implementation.
See also qWarning(), qCritical(), qFatal(), qInstallMsgHandler(), and Debugging Techniques.
Calls the message handler with the fatal message msg. If no message handler has been installed, the message is printed to stderr. Under Windows, the message is sent to the debugger.
For a release library this function will exit the application with return value 1. For the debug version this function will abort on Unix systems to create a core dump, and report a _CRT_ERROR on Windows allowing to connect a debugger to the application.
This function takes a format string and a list of arguments, similar to the C printf() function.
Example:
int divide(int a, int b) { if (b == 0) // program error qFatal("divide: cannot divide by zero"); return a / b; }
Warning: The internal buffer is limited to 8192 bytes, including the '\0'-terminator.
Warning: Passing (const char *)0 as argument to qFatal might lead to crashes on certain platforms due to the platforms printf implementation.
See also qDebug(), qCritical(), qWarning(), qInstallMsgHandler(), and Debugging Techniques.
Installs a Qt message handler h. Returns a pointer to the message handler previously defined.
The message handler is a function that prints out debug messages, warnings and fatal error messages. The Qt library (debug version) contains hundreds of warning messages that are printed when internal errors (usually invalid function arguments) occur. If you implement your own message handler, you get total control of these messages.
The default message handler prints the message to the standard output under X11 or to the debugger under Windows. If it is a fatal message, the application aborts immediately.
Only one message handler can be defined, since this is usually done on an application-wide basis to control debug output.
To restore the message handler, call qInstallMsgHandler(0).
Example:
#include <qapplication.h> #include <stdio.h> #include <stdlib.h> void myMessageOutput(QtMsgType type, const char *msg) { switch (type) { case QtDebugMsg: fprintf(stderr, "Debug: %s\n", msg); break; case QtWarningMsg: fprintf(stderr, "Warning: %s\n", msg); break; case QtCriticalMsg: fprintf(stderr, "Critical: %s\n", msg); break; case QtFatalMsg: fprintf(stderr, "Fatal: %s\n", msg); abort(); } } int main(int argc, char **argv) { qInstallMsgHandler(myMessageOutput); QApplication app(argc, argv); ... return app.exec(); }
See also qDebug(), qWarning(), qFatal(), and Debugging Techniques.
Use QSysInfo::MacintoshVersion instead.
See also QSysInfo.
Returns the maximum of value1 and value2.
Returns the minimum of value1 and value2.
Rounds value up to the nearest 64-bit integer.
Rounds value up to the nearest integer.
Returns the version number of the Qt runtime as a string (for example, "4.1.2"). This may be a different version than the version against which the application was compiled.
See also QT_VERSION_STR.
Calls the message handler with the warning message msg. If no message handler has been installed, the message is printed to stderr. Under Windows, the message is sent to the debugger. This function does nothing if QT_NO_WARNING_OUTPUT was defined during compilation; it exits if the environment variable QT_FATAL_WARNINGS is defined.
This function takes a format string and a list of arguments, similar to the C printf() function.
Example:
void f(int c) { if (c > 200) qWarning("f: bad argument, c == %d", c); }
Warning: The internal buffer is limited to 8192 bytes, including the '\0'-terminator.
Warning: Passing (const char *)0 as argument to qWarning might lead to crashes on certain platforms due to the platforms printf implementation.
See also qDebug(), qCritical(), qFatal(), qInstallMsgHandler(), and Debugging Techniques.
Expands to the size of a pointer in bytes (4 or 8). This is equivalent to sizeof(void *) but can be used in a preprocessor directive.
Marks the string literal sourceText for translation in the given context. Expands to sourceText.
Example:
static const char *greeting_strings[] = { QT_TRANSLATE_NOOP("FriendlyConversation", "Hello"), QT_TRANSLATE_NOOP("FriendlyConversation", "Goodbye") }; QString FriendlyConversation::greeting(int type) { return tr(greeting_strings[type]); } QString global_greeting(int type) { return qApp->translate("FriendlyConversation", greeting_strings[type]); }
See also QT_TR_NOOP() and Internationalization with Qt.
Marks the string literal sourceText for translation in the current context. Expands to sourceText.
Example:
QString FriendlyConversation::greeting(int type) { static const char *greeting_strings[] = { QT_TR_NOOP("Hello"), QT_TR_NOOP("Goodbye") }; return tr(greeting_strings[type]); }
See also QT_TRANSLATE_NOOP() and Internationalization with Qt.
This macro expands a numeric value of the form 0xMMNNPP (MM = major, NN = minor, PP = patch) that specifies Qt's version number. For example, if you compile your application against Qt 4.1.2, the QT_VERSION macro will expand to 0x040102.
You can use QT_VERSION to use the latest Qt features where available. For example:
#if QT_VERSION >= 0x040100 QIcon icon = style()->standardIcon(QStyle::SP_TrashIcon); #else QPixmap pixmap = style()->standardPixmap(QStyle::SP_TrashIcon); QIcon icon(pixmap); #endif
See also QT_VERSION_STR and qVersion().
This macro expands to a string that specifies Qt's version number (for example, "4.1.2"). This is the version against which the application is compiled.
See also qVersion() and QT_VERSION.
Prints a warning message containing the source code file name and line number if test is false.
Q_ASSERT() is useful for testing pre- and post-conditions during development. It does nothing if QT_NO_DEBUG was defined during compilation.
Example:
// File: div.cpp #include <QtGlobal> int divide(int a, int b) { Q_ASSERT(b != 0); return a / b; }
If b is zero, the Q_ASSERT statement will output the following message using the qFatal() function:
ASSERT: "b == 0" in file div.cpp, line 7
See also Q_ASSERT_X(), qFatal(), and Debugging Techniques.
Prints the message what together with the location where, the source file name and line number if test is false.
Q_ASSERT_X is useful for testing pre- and post-conditions during development. It does nothing if QT_NO_DEBUG was defined during compilation.
Example:
// File: div.cpp #include <QtGlobal> int divide(int a, int b) { Q_ASSERT_X(b != 0, "divide", "division by zero"); return a / b; }
If b is zero, the Q_ASSERT_X statement will output the following message using the qFatal() function:
ASSERT failure in divide: "division by zero", file div.cpp, line 7
See also Q_ASSERT(), qFatal(), and Debugging Techniques.
Defined if the the application is compiled using Borland/Turbo C++.
Defined if the the application is compiled using Reliant C++.
Defined if the the application is compiled using Comeau C++.
Defined if the the application is compiled using DEC C++.
Defined if the the application is compiled using Edison Design Group C++.
Defined if the the application is compiled using Green Hills Optimizing C++ Compilers.
Defined if the the application is compiled using GNU C++.
Defined if the the application is compiled using MetaWare High C/C++.
Defined if the the application is compiled using HP aC++.
Defined if the the application is compiled using Intel C++ for Linux, Intel C++ for Windows.
Defined if the the application is compiled using KAI C++.
Defined if the the application is compiled using MIPSpro C++.
Defined if the the application is compiled using Microsoft Visual C/C++, Intel C++ for Windows.
Defined if the the application is compiled using Metrowerks CodeWarrior.
Defined if the the application is compiled using CenterLine C++.
Defined if the the application is compiled using Portland Group C++.
Defined if the the application is compiled using Forte Developer, or Sun Studio C++.
Defined if the the application is compiled using Digital Mars C/C++ (used to be Symantec C++).
Defined if the the application is compiled using SCO OUDK and UDK.
Defined if the the application is compiled using Watcom C++.
If p is 0, prints a warning message containing the source code file name and line number, saying that the program ran out of memory.
Q_CHECK_PTR does nothing if QT_NO_DEBUG was defined during compilation.
Example:
int *a; Q_CHECK_PTR(a = new int[80]); // WRONG! a = new (nothrow) int[80]; // Right Q_CHECK_PTR(a);
See also qWarning() and Debugging Techniques.
Same as foreach(variable, container).
Wraps the signed 64-bit integer literal in a platform-independent way. For example:
qint64 value = Q_INT64_C(932838457459459);
See also qint64 and Q_UINT64_C().
Defined for the X Window System.
Defined on AIX.
Defined on Any BSD 4.4 system.
Defined on BSD/OS.
Defined on Cygwin.
Defined on Darwin OS (synonym for Q_OS_MAC).
Defined on DG/UX.
Defined on DYNIX/ptx.
Defined on FreeBSD.
Defined on HP-UX.
Defined on GNU Hurd.
Defined on SGI Irix.
Defined on Linux.
Defined on LynxOS.
Defined for Mac OS 9.
Defined for Mac OS X.
Defined on MS-DOS and Windows.
Defined on NetBSD.
Defined on OS/2.
Defined on OpenBSD.
Defined on XFree86 on OS/2 (not PM).
Defined on HP Tru64 UNIX.
Defined on QNX RTP 6.1.
Defined on QNX.
Defined for Qt/Embedded.
Defined on Reliant UNIX.
Defined on SCO OpenServer 5.
Defined on Sun Solaris.
Defined on DEC Ultrix.
Defined on Any UNIX BSD/SYSV system.
Defined on UnixWare 7, Open UNIX 8.
Defined on Win32 (Windows 95/98/ME and Windows NT/2000/XP).
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Defined for 32-bit Windows.
Wraps the unsigned 64-bit integer literal in a platform-independent way. For example:
quint64 value = Q_UINT64_C(932838457459459);
See also quint64 and Q_INT64_C().
This macro is used to implement Qt's foreach loop. variable is a variable name or variable definition; container is a Qt container whose value type corresponds to the type of the variable. See The foreach Keyword for details.
If you're worried about namespace pollution, you can disable this macro by adding the following line to your .pro file:
CONFIG += no_keywords
See also Q_FOREACH().
Returns str as a const char *. This is equivalent to str.toAscii().constData().
Example:
qWarning("%s: %s", qPrintable(key), qPrintable(value));
See also qDebug(), qWarning(), qCritical(), and qFatal().
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