// Purpose: interface of wxMimeTypesManager
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
@class wxMimeTypesManager
- This class allows the application to retrieve the information about all known
+ This class allows the application to retrieve informations about all known
MIME types from a system-specific location and the filename extensions to the
- MIME types and vice versa. After initialization the functions
- GetFileTypeFromMimeType() and GetFileTypeFromExtension()
- may be called: they will return a wxFileType object which
- may be further queried for file description, icon and other attributes.
-
- Under Windows, the MIME type information is queried from registry. Under
- Linux and Unix, it is queried from the XDG data directories.
+ MIME types and vice versa.
+
+ MIME stands for "Multipurpose Internet Mail Extensions" and was originally
+ used in mail protocols. It's standardized by several RFCs.
- Currently, wxMimeTypesManager is limited to reading MIME type information.
+ Under Windows, the MIME type information is queried from registry.
+ Under Linux and Unix, it is queried from the XDG data directories.
+
+ Currently, wxMimeTypesManager is limited to @e reading MIME type information.
+
+ The application should not construct its own manager: it should use the
+ object pointer ::wxTheMimeTypesManager.
+ The functions GetFileTypeFromMimeType() and GetFileTypeFromExtension()
+ return a wxFileType object which may be further queried for file description,
+ icon and other attributes.
+
+ @section mimetypemanager_helpers Helper functions
+
+ All of these functions are static (i.e. don't need a wxMimeTypesManager object
+ to call them) and provide some useful operations for string representations of
+ MIME types. Their usage is recommended instead of directly working with MIME
+ types using wxString functions.
- The application should not construct its own manaer: it should use the
- object pointer ::wxTheMimeTypesManger.
+ - wxMimeTypesManager::IsOfType()
+
+ @section mimetypemanager_query Query database
+
+ These functions are the heart of this class: they allow to find a file type
+ object from either file extension or MIME type.
+ If the function is successful, it returns a pointer to the wxFileType object
+ which must be deleted by the caller, otherwise @NULL will be returned.
+
+ - wxMimeTypesManager::GetFileTypeFromMimeType()
+ - wxMimeTypesManager::GetFileTypeFromExtension()
@library{wxbase}
- @category{misc}
+ @category{cfg}
@see wxFileType
*/
/**
Gather information about the files with given extension and return the
corresponding wxFileType object or @NULL if the extension is unknown.
-
+
The @a extension parameter may have, or not, the leading dot, if it has it,
it is stripped automatically. It must not however be empty.
*/
/**
- This function returns @true if either the given @a mimeType is exactly the
- same as @a wildcard or if it has the same category and the subtype of
+ This function returns @true if either the given @a mimeType is exactly
+ the same as @a wildcard or if it has the same category and the subtype of
@a wildcard is '*'. Note that the '*' wildcard is not allowed in
@a mimeType itself.
+
The comparison don by this function is case insensitive so it is not
necessary to convert the strings to the same case before calling it.
*/
static bool IsOfType(const wxString& mimeType, const wxString& wildcard);
-
};
/**
@class wxFileType
- This class holds information about a given @e file type. File type is the same
- as
- MIME type under Unix, but under Windows it corresponds more to an extension than
- to MIME type (in fact, several extensions may correspond to a file type). This
- object may be created in several different ways: the program might know the file
- extension and wish to find out the corresponding MIME type or, conversely, it
+ This class holds information about a given @e file type.
+
+ File type is the same as MIME type under Unix, but under Windows it corresponds
+ more to an extension than to MIME type (in fact, several extensions may
+ correspond to a file type).
+
+ This object may be created in several different ways: the program might know the
+ file extension and wish to find out the corresponding MIME type or, conversely, it
might want to find the right extension for the file to which it writes the
contents of given MIME type. Depending on how it was created some fields may be
unknown so the return value of all the accessors @b must be checked: @false
typically correspond to the extension ".txt", but may as well be associated with
".ini" or ".conf".
+
+ @section filetype_example MessageParameters class
+
+ One of the most common usages of MIME is to encode an e-mail message.
+ The MIME type of the encoded message is an example of a message parameter.
+ These parameters are found in the message headers ("Content-XXX").
+
+ At the very least, they must specify the MIME type and the version of MIME
+ used, but almost always they provide additional information about the message
+ such as the original file name or the charset (for the text documents).
+ These parameters may be useful to the program used to open, edit, view or
+ print the message, so, for example, an e-mail client program will have to
+ pass them to this program. Because wxFileType itself can not know about
+ these parameters, it uses MessageParameters class to query them.
+
+ The default implementation only requires the caller to provide the file name
+ (always used by the program to be called - it must know which file to open)
+ and the MIME type and supposes that there are no other parameters.
+
+ If you wish to supply additional parameters, you must derive your own class
+ from MessageParameters and override GetParamValue() function, for example:
+
+ @code
+ // provide the message parameters for the MIME type manager
+ class MailMessageParameters : public wxFileType::MessageParameters
+ {
+ public:
+ MailMessageParameters(const wxString& filename,
+ const wxString& mimetype)
+ : wxFileType::MessageParameters(filename, mimetype)
+ {
+ }
+
+ virtual wxString GetParamValue(const wxString& name) const
+ {
+ // parameter names are not case-sensitive
+ if ( name.CmpNoCase("charset") == 0 )
+ return "US-ASCII";
+ else
+ return wxFileType::MessageParameters::GetParamValue(name);
+ }
+ };
+ @endcode
+
+ Now you only need to create an object of this class and pass it to, for example,
+ GetOpenCommand like this:
+
+ @code
+ wxString command;
+ if ( filetype->GetOpenCommand(&command,
+ MailMessageParameters("foo.txt", "text/plain")) )
+ {
+ // the full command for opening the text documents is in 'command'
+ // (it might be "notepad foo.txt" under Windows or "cat foo.txt" under Unix)
+ }
+ else
+ {
+ // we don't know how to handle such files...
+ }
+ @endcode
+
+ Windows: As only the file name is used by the program associated with the
+ given extension anyhow (but no other message parameters), there is no need
+ to ever derive from MessageParameters class for a Windows-only program.
+
+
@library{wxbase}
- @category{FIXME}
+ @category{data}
@see wxMimeTypesManager
*/
class wxFileType
{
-public:
+private:
/**
The default constructor is private because you should never create objects of
this type: they are only returned by wxMimeTypesManager methods.
*/
wxFileType();
+public:
+ /**
+ Copy ctor.
+ */
+ wxFileType(const wxFileTypeInfo& ftInfo);
+
/**
The destructor of this class is not virtual, so it should not be derived from.
*/
/**
This function is primarily intended for GetOpenCommand and GetPrintCommand
- usage but may be also used by the application directly if, for example, you want
- to use some non-default command to open the file.
- The function replaces all occurrences of
-
- format specification
-
- with
-
- %s
-
- the full file name
-
- %t
-
- the MIME type
-
- %{param}
-
- the value of the parameter @e param
+ usage but may be also used by the application directly if, for example, you
+ want to use some non-default command to open the file.
+ The function replaces all occurrences of:
+ - %s with the full file name
+ - %t with the MIME type
+ - %{param} with the value of the parameter @e param
using the MessageParameters object you pass to it.
+
If there is no '%s' in the command string (and the string is not empty), it is
assumed that the command reads the data on stdin and so the effect is the same
as " %s" were appended to the string.
+
Unlike all other functions of this class, there is no error return for this
function.
*/
static wxString ExpandCommand(const wxString& command,
- MessageParameters& params);
+ const MessageParameters& params);
/**
If the function returns @true, the string pointed to by @a desc is filled
/**
If the function returns @true, the array @a extensions is filled
with all extensions associated with this file type: for example, it may
- contain the following two elements for the MIME type "text/html" (notice the
- absence of the leading dot): "html" and "htm".
+ contain the following two elements for the MIME type "text/html"
+ (notice the absence of the leading dot): "html" and "htm".
+
@b Windows: This function is currently not implemented: there is no
- (efficient) way to retrieve associated extensions from the given MIME type on
- this platform, so it will only return @true if the wxFileType object was
- created
- by wxMimeTypesManager::GetFileTypeFromExtension
- function in the first place.
+ (efficient) way to retrieve associated extensions from the given MIME type
+ on this platform, so it will only return @true if the wxFileType object was
+ created by wxMimeTypesManager::GetFileTypeFromExtension function in the
+ first place.
*/
bool GetExtensions(wxArrayString& extensions);
/**
If the function returns @true, the @c iconLoc is filled with the
- location of the icon for this MIME type. A wxIcon may be
- created from @a iconLoc later.
+ location of the icon for this MIME type.
+ A wxIcon may be created from @a iconLoc later.
+
@b Windows: The function returns the icon shown by Explorer for the files of
the specified type.
+
@b Mac: This function is not implemented and always returns @false.
+
@b Unix: MIME manager gathers information about icons from GNOME
and KDE settings and thus GetIcon's success depends on availability
of these desktop environments.
bool GetMimeType(wxString* mimeType) const;
/**
- Same as GetMimeType() but returns array of MIME
- types. This array will contain only one item in most cases but sometimes,
- notably under Unix with KDE, may contain more MIME types. This happens when
- one file extension is mapped to different MIME types by KDE, mailcap and
- mime.types.
+ Same as GetMimeType() but returns array of MIME types.
+
+ This array will contain only one item in most cases but sometimes,
+ notably under Unix with KDE, may contain more MIME types.
+ This happens when one file extension is mapped to different MIME types
+ by KDE, mailcap and mime.types.
*/
- bool GetMimeType(wxArrayString& mimeTypes);
+ bool GetMimeTypes(wxArrayString& mimeTypes) const;
//@{
/**
With the first version of this method, if the @true is returned, the
string pointed to by @a command is filled with the command which must be
- executed (see wxExecute()) in order to open the file of the
- given type. In this case, the name of the file as well as any other parameters
- is retrieved from MessageParameters()
- class.
+ executed (see wxExecute()) in order to open the file of the given type.
+
+ In this case, the name of the file as well as any other parameters
+ is retrieved from MessageParameters() class.
+
In the second case, only the filename is specified and the command to be used
to open this kind of file is returned directly. An empty string is returned to
indicate that an error occurred (typically meaning that there is no standard way
to open this kind of files).
*/
- bool GetOpenCommand(wxString* command,
- MessageParameters& params);
- wxString GetOpenCommand(const wxString& filename);
+ bool GetOpenCommand(wxString* command, const MessageParameters& params);
+ wxString GetOpenCommand(const wxString& filename) const;
//@}
/**
If the function returns @true, the string pointed to by @a command is filled
- with the command which must be executed (see wxExecute()) in
- order to print the file of the given type. The name of the file is
- retrieved from MessageParameters() class.
- */
- bool GetPrintCommand(wxString* command,
- MessageParameters& params);
+ with the command which must be executed (see wxExecute()) in order to
+ print the file of the given type.
- /**
- One of the most common usages of MIME is to encode an e-mail message. The MIME
- type of the encoded message is an example of a @e message parameter. These
- parameters are found in the message headers ("Content-XXX"). At the very least,
- they must specify the MIME type and the version of MIME used, but almost always
- they provide additional information about the message such as the original file
- name or the charset (for the text documents).
- These parameters may be useful to the program used to open, edit, view or print
- the message, so, for example, an e-mail client program will have to pass them to
- this program. Because wxFileType itself can not know about these parameters,
- it uses MessageParameters class to query them. The default implementation only
- requires the caller to provide the file name (always used by the program to be
- called - it must know which file to open) and the MIME type and supposes that
- there are no other parameters. If you wish to supply additional parameters, you
- must derive your own class from MessageParameters and override GetParamValue()
- function, for example:
-
- Now you only need to create an object of this class and pass it to, for example,
- GetOpenCommand() like this:
-
- @b Windows: As only the file name is used by the program associated with the
- given extension anyhow (but no other message parameters), there is no need to
- ever derive from MessageParameters class for a Windows-only program.
+ The name of the file is retrieved from the MessageParameters class.
*/
+ bool GetPrintCommand(wxString* command,
+ const MessageParameters& params) const;
};
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