X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e12be2f7fb5f55553795b7c4168007173511d581..444cb676b239bd5d87c645c21c800053271cc348:/docs/latex/wx/function.tex diff --git a/docs/latex/wx/function.tex b/docs/latex/wx/function.tex index d4003c3291..3c6f375dd2 100644 --- a/docs/latex/wx/function.tex +++ b/docs/latex/wx/function.tex @@ -4,6 +4,58 @@ The functions defined in wxWindows are described here. +\section{Thread functions}\label{threadfunctions} + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxThread}{wxthread}, \helpref{wxMutex}{wxmutex}, \helpref{Multithreading overview}{wxthreadoverview} + +\membersection{::wxMutexGuiEnter}\label{wxmutexguienter} + +\func{void}{wxMutexGuiEnter}{\void} + +This function must be called when any thread other than the main GUI thread +wants to get access to the GUI library. This function will block the execution +of the calling thread until the main thread (or any other thread holding the +main GUI lock) leaves the GUI library and no other other thread will enter +the GUI library until the calling thread calls \helpref{::wxMutexGuiLeave()}{wxmutexguileave}. + +Typically, these functions are used like this: + +\begin{verbatim} +void MyThread::Foo(void) +{ + // before doing any GUI calls we must ensure that this thread is the only + // one doing it! + + wxMutexGuiEnter(); + + // Call GUI here: + my_window->DrawSomething(); + + wxMutexGuiLeave(); +} +\end{verbatim} + +Note that under GTK, no creation of top-level windows is allowed in any +thread but the main one. + +This function is only defined on platforms which support preemptive +threads. + +\membersection{::wxMutexGuiLeave}\label{wxmutexguileave} + +\func{void}{wxMutexGuiLeave}{\void} + +See \helpref{::wxMutexGuiEnter()}{wxmutexguienter}. + +This function is only defined on platforms which support preemptive +threads. + \section{File functions}\label{filefunctions} \wxheading{Include files} @@ -34,6 +86,12 @@ slashes. Returns TRUE if the file exists. It also returns TRUE if the file is a directory. +\membersection{::wxFileModificationTime} + +\func{time\_t}{wxFileModificationTime}{\param{const wxString\& }{filename}} + +Returns time of last modification of given file. + \membersection{::wxFileNameFromPath} \func{wxString}{wxFileNameFromPath}{\param{const wxString\& }{path}} @@ -81,19 +139,6 @@ See \helpref{wxFindFirstFile}{wxfindfirstfile} for an example. Returns the Windows directory under Windows; on other platforms returns the empty string. -\membersection{::wxInitAllImageHandlers}\label{wxinitallimagehandlers} - -\func{void}{wxInitAllImageHandlers}{\void} - -Adds some common image format handlers, which, depending on wxWindows -configuration, can be handlers for BMP (loading) (always installed), GIF -(loading), PCX (loading), PNM (loading and saving as raw -rgb), PNG (loading and saving), JPEG (loading and saving), file formats. - -\wxheading{See also} - -\helpref{wxImage}{wximage}, \helpref{wxImageHandler}{wximagehandler} - \membersection{::wxIsAbsolutePath} \func{bool}{wxIsAbsolutePath}{\param{const wxString\& }{filename}} @@ -214,7 +259,7 @@ Under MS Windows, the current drive is also changed if {\it dir} contains a driv \membersection{::wxSplitPath}\label{wxsplitfunction} -\func{void}{wxSplitPath}{\param{const char *}{ fullname}, \param{const wxString *}{ path}, \param{const wxString *}{ name}, \param{const wxString *}{ ext}} +\func{void}{wxSplitPath}{\param{const char *}{ fullname}, \param{wxString *}{ path}, \param{wxString *}{ name}, \param{wxString *}{ ext}} This function splits a full file name into components: the path (including possible disk/drive specification under Windows), the base name and the extension. Any of the output parameters @@ -410,7 +455,7 @@ case-sensitive comparison. \func{size\_t}{Strlen}{\param{const char *}{ p}} This is a safe version of standard function {\it strlen()}: it does exactly the -same thing (i.e. returns the length of the string) except that it returns 0 if +same thing (i.e. returns the length of the string) except that it returns 0 if {\it p} is the NULL pointer. \membersection{::wxGetTranslation}\label{wxgettranslation} @@ -419,7 +464,7 @@ same thing (i.e. returns the length of the string) except that it returns 0 if This function returns the translation of string {\it str} in the current \helpref{locale}{wxlocale}. If the string is not found in any of the loaded -message catalogs (see \helpref{i18n overview}{internationalization}), the +message catalogs (see \helpref{internationalization overview}{internationalization}), the original string is returned. In debug build, an error message is logged - this should help to find the strings which were not yet translated. As this function is used very often, an alternative syntax is provided: the \_() macro is @@ -523,6 +568,24 @@ if (s) +\membersection{::wxGetColourFromUser}\label{wxgetcolourfromuser} + +\func{wxColour}{wxGetColourFromUser}{\param{wxWindow *}{parent}, \param{const wxColour\& }{colInit}} + +Shows the colour selection dialog and returns the colour selected by user or +invalid colour (use \helpref{wxColour::Ok}{wxcolourok} to test whether a colour +is valid) if the dialog was cancelled. + +\wxheading{Parameters} + +\docparam{parent}{The parent window for the colour selection dialog} + +\docparam{colInit}{If given, this will be the colour initially selected in the dialog.} + +\wxheading{Include files} + + + \membersection{::wxGetNumberFromUser}\label{wxgetnumberfromuser} \func{long}{wxGetNumberFromUser}{ @@ -550,6 +613,19 @@ Dialog is centered on its {\it parent} unless an explicit position is given in +\membersection{::wxGetPasswordFromUser}\label{wxgetpasswordfromuser} + +\func{wxString}{wxGetTextFromUser}{\param{const wxString\& }{message}, \param{const wxString\& }{caption = ``Input text"},\\ + \param{const wxString\& }{default\_value = ``"}, \param{wxWindow *}{parent = NULL}} + +Similar to \helpref{wxGetTextFromUser}{wxgettextfromuser} but the text entered +in the dialog is not shown on screen but replaced with stars. This is intended +to be used for entering passwords as the function name implies. + +\wxheading{Include files} + + + \membersection{::wxGetTextFromUser}\label{wxgettextfromuser} \func{wxString}{wxGetTextFromUser}{\param{const wxString\& }{message}, \param{const wxString\& }{caption = ``Input text"},\\ @@ -653,10 +729,10 @@ wxCANCEL.} wxYES\_NO or wxOK.} \twocolitem{wxOK}{Puts an Ok button on the message box. May be combined with wxCANCEL.} \twocolitem{wxCENTRE}{Centres the text.} -\twocolitem{wxICON\_EXCLAMATION}{Under Windows, displays an exclamation mark symbol.} -\twocolitem{wxICON\_HAND}{Under Windows, displays a hand symbol.} -\twocolitem{wxICON\_QUESTION}{Under Windows, displays a question mark symbol.} -\twocolitem{wxICON\_INFORMATION}{Under Windows, displays an information symbol.} +\twocolitem{wxICON\_EXCLAMATION}{Displays an exclamation mark symbol.} +\twocolitem{wxICON\_HAND}{Displays a hand symbol.} +\twocolitem{wxICON\_QUESTION}{Displays a question mark symbol.} +\twocolitem{wxICON\_INFORMATION}{Displays an information symbol.} \end{twocollist} The return value is one of: wxYES, wxNO, wxCANCEL, wxOK. @@ -876,7 +952,7 @@ Sets the translation (from the top left corner) for PostScript output. The defau \section{Clipboard functions}\label{clipsboard} These clipboard functions are implemented for Windows only. The use of these functions -is deprecated and the code is no longer maintained. Use the \helpref{wxClipboard}{wxclipboard} +is deprecated and the code is no longer maintained. Use the \helpref{wxClipboard}{wxclipboard} class instead. \wxheading{Include files} @@ -1040,7 +1116,7 @@ registered with the dynamic class system using DECLARE... and IMPLEMENT... macro Called when wxWindows exits, to clean up the DDE system. This no longer needs to be called by the application. -See also helpref{wxDDEInitialize}{wxddeinitialize}. +See also \helpref{wxDDEInitialize}{wxddeinitialize}. \wxheading{Include files} @@ -1101,7 +1177,7 @@ Gets the physical size of the display in pixels. \func{void}{wxEnableTopLevelWindow}{\param{bool}{ enable = TRUE}} -This function enables or disables all top level windows. It is used by +This function enables or disables all top level windows. It is used by \helpref{::wxSafeYield}{wxsafeyield}. \wxheading{Include files} @@ -1182,6 +1258,8 @@ wxWindows errors. See also \helpref{wxFatalError}{wxfatalerror}. \func{long}{wxExecute}{\param{char **}{argv}, \param{bool }{sync = FALSE}, \param{wxProcess *}{callback = NULL}} +\func{long}{wxExecute}{\param{const wxString\& }{command}, \param{wxArrayString\& }{output}} + Executes another program in Unix or Windows. The first form takes a command string, such as {\tt "emacs file.txt"}. @@ -1189,6 +1267,9 @@ The first form takes a command string, such as {\tt "emacs file.txt"}. The second form takes an array of values: a command, any number of arguments, terminated by NULL. +The semantics of the third version is different from the first two and is +described in more details below. + If {\it sync} is FALSE (the default), flow of control immediately returns. If TRUE, the current application waits until the other program has terminated. @@ -1197,7 +1278,7 @@ the process (which terminates by the moment the function returns) and will be $-1$ if the process couldn't be started and typically 0 if the process terminated successfully. Also, while waiting for the process to terminate, wxExecute will call \helpref{wxYield}{wxyield}. The caller -should ensure that this can cause no recursion, in the simples case by +should ensure that this can cause no recursion, in the simplest case by calling \helpref{wxEnableTopLevelWindows(FALSE)}{wxenabletoplevelwindows}. For asynchronous execution, however, the return value is the process id and @@ -1208,7 +1289,12 @@ parameter can not be non NULL for synchronous execution), \helpref{wxProcess::OnTerminate}{wxprocessonterminate} will be called when the process finishes. -See also \helpref{wxShell}{wxshell}, \helpref{wxProcess}{wxprocess}. +Finally, you may use the third overloaded version of this function to execute +a process (always synchronously) and capture its output in the array +{\it output}. + +See also \helpref{wxShell}{wxshell}, \helpref{wxProcess}{wxprocess}, +\helpref{Exec sample}{sampleexec}. \wxheading{Include files} @@ -1462,6 +1548,18 @@ Under Windows, this returns ``unknown''. +\membersection{::wxHandleFatalExceptions}\label{wxhandlefatalexceptions} + +\func{bool}{wxHandleFatalExceptions}{\param{bool}{ doIt = TRUE}} + +If {\it doIt} is TRUE, the fatal exceptions (also known as general protection +faults under Windows or segmentation violations in the Unix world) will be +caught and passed to \helpref{wxApp::OnFatalException}{wxapponfatalexception}. +By default, i.e. before this function is called, they will be handled in the +normal way which usually just means that the application will be terminated. +Calling wxHandleFatalExceptions() with {\it doIt} equal to FALSE will restore +this default behaviour. + \membersection{::wxKill}\label{wxkill} \func{int}{wxKill}{\param{long}{ pid}, \param{int}{ sig}} @@ -1476,6 +1574,17 @@ It does not raise a signal in the receiving process. +\membersection{::wxInitAllImageHandlers}\label{wxinitallimagehandlers} + +\func{void}{wxInitAllImageHandlers}{\void} + +Initializes all available image handlers. For a list of available handlers, +see \helpref{wxImage}{wximage}. + +\wxheading{See also} + +\helpref{wxImage}{wximage}, \helpref{wxImageHandler}{wximagehandler} + \membersection{::wxIsBusy}\label{wxisbusy} \func{bool}{wxIsBusy}{\void} @@ -1600,7 +1709,7 @@ See also \helpref{wxGetDisplayName}{wxgetdisplayname}. Executes a command in an interactive shell window. If no command is specified, then just the shell is spawned. -See also \helpref{wxExecute}{wxexecute}. +See also \helpref{wxExecute}{wxexecute}, \helpref{Exec sample}{sampleexec}. \wxheading{Include files} @@ -1742,8 +1851,8 @@ See also \helpref{wxGetResource}{wxgetresource}, \helpref{wxConfigBase}{wxconfig Yields control to pending messages in the windowing system. This can be useful, for example, when a time-consuming process writes to a text window. Without an occasional -yield, the text window will not be updated properly, and (since Windows -multitasking is cooperative) other processes will not respond. +yield, the text window will not be updated properly, and on systems with +cooperative multitasking, such as Windows 3.1 other processes will not respond. Caution should be exercised, however, since yielding may allow the user to perform actions which are not compatible with the current task. @@ -1751,6 +1860,12 @@ Disabling menu items or whole menus during processing can avoid unwanted reentrance of code: see \helpref{::wxSafeYield}{wxsafeyield} for a better function. +Note that wxYield will not flush the message logs. This is intentional as +calling wxYield is usually done to quickly update the screen and popping up a +message box dialog may be undesirable. If you do with to flush the log +messages immediately (otherwise it will be done during the next idle loop +iteration), call \helpref{wxLog::FlushActive}{wxlogflushactive}. + \wxheading{Include files} or @@ -2415,6 +2530,11 @@ as the last system error code ({\it errno} or {\it ::GetLastError()} depending on the platform) and the corresponding error message. The second form of this function takes the error code explitly as the first argument. +\wxheading{See also} + +\helpref{wxSysErrorCode}{wxsyserrorcode}, +\helpref{wxSysErrorMsg}{wxsyserrormsg} + \membersection{::wxLogDebug}\label{wxlogdebug} \func{void}{wxLogDebug}{\param{const char*}{ formatString}, \param{...}{}} @@ -2470,6 +2590,31 @@ trace masks. \item wxTraceOleCalls: trace OLE method calls (Win32 only) \end{itemize} +\membersection{::wxSysErrorCode}\label{wxsyserrorcode} + +\func{unsigned long}{wxSysErrorCode}{\void} + +Returns the error code from the last system call. This function uses +{\tt errno} on Unix platforms and {\tt GetLastError} under Win32. + +\wxheading{See also} + +\helpref{wxSysErrorMsg}{wxsyserrormsg}, +\helpref{wxLogSysError}{wxlogsyserror} + +\membersection{::wxSysErrorMsg}\label{wxsyserrormsg} + +\func{const wxChar *}{wxSysErrorMsg}{\param{unsigned long }{errCode = 0}} + +Returns the error message corresponding to the given system error code. If +{\it errCode} is $0$ (default), the last error code (as returned by +\helpref{wxSysErrorCode}{wxsyserrorcode}) is used. + +\wxheading{See also} + +\helpref{wxSysErrorCode}{wxsyserrorcode}, +\helpref{wxLogSysError}{wxlogsyserror} + \section{Debugging macros and functions}\label{debugmacros} Useful macros and functins for error checking and defensive programming. ASSERTs are only