g_try_new()

最新推荐文章于 2023-02-07 17:25:18 发布

lwpping

最新推荐文章于 2023-02-07 17:25:18 发布

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文章标签： file duplicates string domain struct

本文深入探讨了Glib库中的g_try_new、g_strdup和g_file_get_contents等核心字符串操作函数，包括参数说明、返回值及使用示例，帮助开发者熟练掌握Glib库的字符串处理能力。

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http://developer.gnome.org/glib/2.28/glib-String-Utility-Functions.html

g_try_new()

#define             g_try_new(struct_type, n_structs)

Attempts to allocate n_structs elements of type struct_type, and returns NULL on failure. Contrast with g_new(), which aborts the program on failure. The returned pointer is cast to a pointer to the given type. If n_structs is 0 it returns NULL.

`struct_type` :	the type of the elements to allocate
`n_structs` :	the number of elements to allocate
Returns :	a pointer to the allocated memory, cast to a pointer to `struct_type`

g_strdup ()

gchar *	               g_strdup                         (const gchar *str);

Duplicates a string. If str is NULL it returns NULL. The returned string should be freed with g_free() when no longer needed.

`str` :	the string to duplicate
Returns :	a newly-allocated copy of `str`

g_file_get_contents ()

gboolean            g_file_get_contents                 (const gchar *filename,
                                                         gchar **contents,
                                                         gsize *length,
                                                         GError **error);

Reads an entire file into allocated memory, with good error checking.

If the call was successful, it returns TRUE and sets contents to the file contents and length to the length of the file contents in bytes. The string stored in contents will be nul-terminated, so for text files you can pass NULL for the length argument. If the call was not successful, it returns FALSE and setserror. The error domain is G_FILE_ERROR. Possible error codes are those in the GFileError enumeration. In the error case, contents is set to NULL andlength is set to zero.

`filename` :	name of a file to read contents from, in the GLib file name encoding. [type filename]
`contents` :	location to store an allocated string, use `g_free()` to free the returned string. [out][array length=length][element-type guint8]
`length` :	location to store length in bytes of the contents, or `NULL`. [allow-none]
`error` :	return location for a GError, or `NULL`
Returns :	`TRUE` on success, `FALSE` if an error occurred