c++ - 以编程方式在 Linux 上更改墙纸

Question

如何在 C/C++ 程序中更改 Linux 桌面(使用 GNOME)上的墙纸？是否有系统 API 可以做到这一点？

Answer 1

你可以使用 gconf图书馆来做。下面的示例是一个完整的改变背景的程序:

// bkgmanage.c
#include <glib.h>
#include <gconf/gconf-client.h>
#include <stdio.h>

typedef enum {
    WALLPAPER_ALIGN_TILED     = 0,
    WALLPAPER_ALIGN_CENTERED  = 1,
    WALLPAPER_ALIGN_STRETCHED = 2,
    WALLPAPER_ALIGN_SCALED    = 3,
    WALLPAPER_NONE            = 4
} WallpaperAlign;

gboolean set_as_wallpaper( const gchar *image_path, WallpaperAlign align )
{
    GConfClient *client;
    char        *options = "none";

    client = gconf_client_get_default();

    // TODO: check that image_path is a file
    if ( image_path == NULL ) options = "none";
    else {
        gconf_client_set_string( client, 
            "/desktop/gnome/background/picture_filename",
            image_path,
            NULL );
        switch ( align ) {
            case WALLPAPER_ALIGN_TILED: options = "wallpaper"; break;
            case WALLPAPER_ALIGN_CENTERED: options = "centered"; break;
            case WALLPAPER_ALIGN_STRETCHED: options = "stretched"; break;
            case WALLPAPER_ALIGN_SCALED: options = "scaled"; break;
            case WALLPAPER_NONE: options = "none"; break;
        }
    }
    gboolean result = gconf_client_set_string( client, 
        "/desktop/gnome/background/picture_options", 
        options,
        NULL);
    g_object_unref( G_OBJECT(client) );

    return result;
}

int main(int argc, const char* argv[])
{
  if ( argc > 1 ) {
    printf( "Setting %s as wallpaper... ", argv[1] );
    if ( set_as_wallpaper( argv[1], WALLPAPER_ALIGN_STRETCHED ) ) printf( "Ok\n" );
    else printf( "Failed\n" );
  } else printf( "Usage: ./bkgmanage <filename>\n" );

  return 0;
}

以上来源基于gthumb项目。它可以用以下字符串编译:

gcc -Wall -g `pkg-config --libs --cflags glib-2.0 gconf-2.0` bkgmanage.c -o bkgmanage