set wallpaper util

wpset.c

#include <stdio.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
typedef enum
{
	Tile,
	Center,
	Stretch,
	Fit,
	Fill
} WallpaperStyle;

void wallpaper_set(char *path, WallpaperStyle s)
{
	HKEY key = NULL;
	if (!SUCCEEDED(HRESULT_FROM_WIN32(RegOpenKeyExA(
			HKEY_CURRENT_USER,
			"Control Panel\\Desktop", 0, KEY_READ | KEY_WRITE, &key))))
		return;

	typedef struct
	{
		char *v;
		size_t len;
	} str;
	str style, tile;

	switch (s)
	{
	case Tile:
		style.v = "0";
		style.len = sizeof("0");
		tile.v = "1";
		tile.len = sizeof("1");
		break;
	case Center:
		style.v = "0";
		style.len = sizeof("0");
		tile.v = "0";
		tile.len = sizeof("0");
		break;
	case Stretch:
		style.v = "2";
		style.len = sizeof("2");
		tile.v = "0";
		tile.len = sizeof("0");
		break;
	case Fit:
		style.v = "6";
		style.len = sizeof("6");
		tile.v = "0";
		tile.len = sizeof("0");
		break;
	case Fill:
		style.v = "10";
		style.len = sizeof("10");
		tile.v = "0";
		tile.len = sizeof("0");
		break;
	}
	RegSetValueExA(key, "WallpaperStyle", 0, REG_SZ, style.v, style.len);
	RegSetValueExA(key, "TileWallpaper", 0, REG_SZ, tile.v, tile.len);
	RegCloseKey(key);
	SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0, path,
						  SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
}

int main(int argc, char **argv)
{
	if (argc != 3)
	{
		printf("Usage: wpset [image] [tile|center|stretch|fit|fill]\n");
		return 0;
	}
	typedef struct
	{
		char *string;
		WallpaperStyle style;
	} StyleString;
	static StyleString strings[] = {
		{"tile", Tile},
		{"center", Center},
		{"stretch", Stretch},
		{"fit", Fit},
		{"fill", Fill}};
	int style = -1;
	for (unsigned i = 0; i < sizeof(strings) / sizeof(strings[0]); i++)
	{
		if (strcmp(argv[2], strings[i].string) == 0)
		{
			style = strings[i].style;
			break;
		}
	}
	if (style == -1)
	{
		printf("Usage: wpset [image] [tile|center|stretch|fit|fill]\n");
		return 0;
	}
	wallpaper_set(argv[1], style);
	return 0;
}