Windows Compatibility Functions

Windows Compatibility Functions — UNIX emulation on Windows.

Synopsis


#include <glib.h>


#define     MAXPATHLEN
#define     pipe                            (phandles)
gchar*      g_win32_error_message           (gint error);
gchar*      g_win32_getlocale               (void);
gchar*      g_win32_get_package_installation_directory
                                            (gchar *package,
                                             gchar *dll_name);
gchar*      g_win32_get_package_installation_subdirectory
                                            (gchar *package,
                                             gchar *dll_name,
                                             gchar *subdir);
guint       g_win32_get_windows_version     (void);
#define     G_WIN32_DLLMAIN_FOR_DLL_NAME    (static, dll_name)
#define     G_WIN32_HAVE_WIDECHAR_API       ()
#define     G_WIN32_IS_NT_BASED             ()

Description

Details

MAXPATHLEN

#define MAXPATHLEN 1024

Provided for UNIX emulation on Windows; equivalent to UNIX macro MAXPATHLEN, which is the maximum length of a filename (including full path).


pipe()

#define pipe(phandles)	_pipe (phandles, 4096, _O_BINARY)

Provided for UNIX emulation on Windows; see documentation for pipe() in any UNIX manual.

phandles :

g_win32_error_message ()

gchar*      g_win32_error_message           (gint error);

Translate a Win32 error code (as returned by GetLastError()) into the corresponding message. The message is either language neutral, or in the thread's language, or the user's language, the system's language, or US English (see docs for FormatMessage()). The returned string is in UTF-8. It should be deallocated with g_free().

error : error code.
Returns : newly-allocated error message

g_win32_getlocale ()

gchar*      g_win32_getlocale               (void);

The setlocale() function in the Microsoft C library uses locale names of the form "English_United States.1252" etc. We want the UNIXish standard form "en_US", "zh_TW" etc. This function gets the current thread locale from Windows - without any encoding info - and returns it as a string of the above form for use in forming file names etc. The returned string should be deallocated with g_free().

Returns : newly-allocated locale name.

g_win32_get_package_installation_directory ()

gchar*      g_win32_get_package_installation_directory
                                            (gchar *package,
                                             gchar *dll_name);

Try to determine the installation directory for a software package. Typically used by GNU software packages.

package should be a short identifier for the package. Typically it is the same identifier as used for GETTEXT_PACKAGE in software configured according to GNU standards. The function first looks in the Windows Registry for the value #InstallationDirectory in the key #HKLM\Software\package, and if that value exists and is a string, returns that.

If package is NULL, or the above value isn't found in the Registry, but dll_name is non-NULL, it should name a DLL loaded into the current process. Typically that would be the name of the DLL calling this function, looking for its installation directory. The function then asks Windows what directory that DLL was loaded from. If that directory's last component is "bin" or "lib", the parent directory is returned, otherwise the directory itself. If that DLL isn't loaded, the function proceeds as if dll_name was NULL.

If both package and dll_name are NULL, the directory from where the main executable of the process was loaded is uses instead in the same way as above.

package : An identifier for a software package, or NULL, in UTF-8
dll_name : The name of a DLL that a package provides, or NULL, in UTF-8
Returns : a string containing the installation directory for package. The string is in the GLib file name encoding, i.e. UTF-8 on Windows. The return value should be freed with g_free() when not needed any longer.

g_win32_get_package_installation_subdirectory ()

gchar*      g_win32_get_package_installation_subdirectory
                                            (gchar *package,
                                             gchar *dll_name,
                                             gchar *subdir);

Returns a newly-allocated string containing the path of the subdirectory subdir in the return value from calling g_win32_get_package_installation_directory() with the package and dll_name parameters.

package : An identifier for a software package, in UTF-8, or NULL
dll_name : The name of a DLL that a package provides, in UTF-8, or NULL
subdir : A subdirectory of the package installation directory, also in UTF-8
Returns : a string containing the complete path to subdir inside the installation directory of package. The returned string is in the GLib file name encoding, i.e. UTF-8 on Windows. The return value should be freed with g_free() when no longer needed.

g_win32_get_windows_version ()

guint       g_win32_get_windows_version     (void);

Returns version information for the Windows operating system the code is running on. See MSDN documentation for the GetVersion() function. To summarize, the most significant bit is one on Win9x, and zero on NT-based systems. The least significant byte is 4 on Windows NT 4, 5 on Windows XP. Software that needs really detailled version and feature information should use Win32 API like GetVersionEx() and VerifyVersionInfo().

If there is an environment variable G_WIN32_PRETEND_WIN9X defined (with any value), this function always returns a version code for Windows 9x. This is mainly an internal debugging aid for GTK+ and GLib developers, to be able to check the code paths for Windows 9x.

Returns : The version information.

Since 2.6


G_WIN32_DLLMAIN_FOR_DLL_NAME()

#define     G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)

On Windows, this macro defines a DllMain() function that stores the actual DLL name that the code being compiled will be included in.

On non-Windows platforms, expands to nothing.

static : empty or "static".
dll_name : the name of the (pointer to the) char array where the DLL name will be stored. If this is used, you must also include windows.h. If you need a more complex DLL entry point function, you cannot use this.

G_WIN32_HAVE_WIDECHAR_API()

#define G_WIN32_HAVE_WIDECHAR_API() (G_WIN32_IS_NT_BASED ())

On Windows, this macro defines an expression which evaluates to TRUE if the code is running on a version of Windows where the wide character versions of the Win32 API functions, and the wide chaacter versions of the C library functions work. (They are always present in the DLLs, but don't work on Windows 9x and Me.)

On non-Windows platforms, it is not defined.

Since 2.6


G_WIN32_IS_NT_BASED()

#define G_WIN32_IS_NT_BASED() (g_win32_get_windows_version () < 0x80000000)

On Windows, this macro defines an expression which evaluates to TRUE if the code is running on an NT-based Windows operating system.

On non-Windows platforms, it is not defined.

Since 2.6