Added !SetWallpaper bang.

Usage: !SetWallpaper [File] (Style)
where style is CENTER, TILE, STRETCH, FIT, or FILL. FIT/FILL available only on Windows 7 (and higher).

Library/Rainmeter.cpp

@@ -420,6 +420,30 @@ void CRainmeter::Bang_SetClip(const WCHAR* arg)
 	}
 }
 
+/*
+** Bang_SetWallpaper
+**
+** !SetWallpaper bang
+**
+*/
+void CRainmeter::Bang_SetWallpaper(const WCHAR* arg)
+{
+	std::vector<std::wstring> subStrings = ParseString(arg);
+
+	if (subStrings.size() == 1)
+	{
+		CSystem::SetWallpaper(subStrings[0], L"");
+	}
+	else if (subStrings.size() == 2)
+	{
+		CSystem::SetWallpaper(subStrings[0], subStrings[1]);
+	}
+	else
+	{
+		Log(LOG_ERROR, L"!SetWallpaper: Invalid parameters");
+	}
+}
+
 /*
 ** Bang_SkinMenu
 **
@@ -1756,6 +1780,10 @@ void CRainmeter::ExecuteBang(const std::wstring& name, std::wstring& arg, CMeter
 	{
 		Bang_SetClip(args);
 	}
+	else if (_wcsicmp(bang, L"SetWallpaper") == 0)
+	{
+		Bang_SetWallpaper(args);
+	}
 	else if (_wcsicmp(bang, L"About") == 0)
 	{
 		CDialogAbout::Open(args);

Library/Rainmeter.h

@@ -221,6 +221,7 @@ private:
 	void Bang_ToggleConfig(const WCHAR* arg);
 	void Bang_DeactivateConfigGroup(const WCHAR* arg);
 	void Bang_SetClip(const WCHAR* arg);
+	void Bang_SetWallpaper(const WCHAR* arg);
 	void Bang_SkinMenu(const WCHAR* arg);
 	void Bang_TrayMenu();
 	void Bang_WriteKeyValue(const WCHAR* arg, CMeterWindow* meterWindow);
@@ -309,17 +310,11 @@ private:
 	GlobalConfig m_GlobalConfig;
 };
 
-#ifdef LIBRARY_EXPORTS
-#define EXPORT_PLUGIN __declspec(dllexport)
-#else
-#define EXPORT_PLUGIN __declspec(dllimport)
-#endif
-
 extern "C"
 {
-	EXPORT_PLUGIN int Initialize(HWND hWnd, HINSTANCE hInstance, LPCWSTR lpCmdLine);
-	EXPORT_PLUGIN void Quit();
-	EXPORT_PLUGIN void ExecuteBang(LPCTSTR szBang);
+	int Initialize(HWND hWnd, HINSTANCE hInstance, LPCWSTR lpCmdLine);
+	void Quit();
+	void ExecuteBang(LPCTSTR szBang);
 }
 
 #endif

Library/System.cpp

@@ -24,6 +24,8 @@
 #include "MeasureNet.h"
 #include "Error.h"
 
+using namespace Gdiplus;
+
 #define DEBUG_VERBOSE  (0)  // Set 1 if you need verbose logging.
 
 #define ZPOS_FLAGS	(SWP_NOMOVE | SWP_NOSIZE | SWP_NOOWNERZORDER | SWP_NOACTIVATE | SWP_NOSENDCHANGING)
@@ -1176,6 +1178,92 @@ void CSystem::SetClipboardText(const std::wstring& text)
 	}
 }
 
+/*
+** SetWallpaper
+**
+** Sets the system wallpapar.
+**
+*/
+void CSystem::SetWallpaper(const std::wstring& wallpaper, const std::wstring& style)
+{
+	auto setWallpaperStyle = [&]()
+	{
+		if (!style.empty())
+		{
+			HKEY hKey;
+			if (RegOpenKeyEx(HKEY_CURRENT_USER, L"Control Panel\\Desktop", 0, KEY_SET_VALUE, &hKey) == ERROR_SUCCESS)
+			{
+				const WCHAR* wallStyle = NULL;
+				const WCHAR* wallTile = L"0";
+
+				const WCHAR* option = style.c_str();
+				if (_wcsicmp(option, L"CENTER") == 0)
+				{
+					wallStyle = L"0";
+				}
+				else if (_wcsicmp(option, L"TILE") == 0)
+				{
+					wallStyle = L"0";
+					wallTile = L"1";
+				}
+				else if (_wcsicmp(option, L"STRETCH") == 0)
+				{
+					wallStyle = L"2";
+				}
+				else if (GetOSPlatform() >= OSPLATFORM_7)
+				{
+					if (_wcsicmp(option, L"FIT") == 0)
+					{
+						wallStyle = L"6";
+					}
+					else if (_wcsicmp(option, L"FILL") == 0)
+					{
+						wallStyle = L"10";
+					}
+				}
+
+				if (wallStyle)
+				{
+					RegSetValueEx(hKey, L"WallpaperStyle", 0, REG_SZ, (const BYTE*)wallStyle, sizeof(WCHAR) * 2);
+					RegSetValueEx(hKey, L"TileWallpaper", 0, REG_SZ, (const BYTE*)wallTile, sizeof(WCHAR) * 2);
+				}
+				else
+				{
+					Log(LOG_ERROR, L"!SetWallpaper: Invalid style");
+				}
+
+				RegCloseKey(hKey);
+			}
+		}
+	};
+
+	if (!wallpaper.empty())
+	{
+		if (GetOSPlatform() < OSPLATFORM_7)
+		{
+			// Gotta convert to .bmp for pre-7
+			Bitmap* bitmap = Bitmap::FromFile(wallpaper.c_str());
+			if (bitmap && bitmap->GetLastStatus() == Ok)
+			{
+				std::wstring file = Rainmeter->GetSettingsPath();
+				file += L"Wallpaper.bmp";
+
+				const CLSID jpegClsid = { 0x557cf400, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } };
+				if (bitmap->Save(file.c_str(), &jpegClsid) == Ok)
+				{
+					setWallpaperStyle();
+					SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (void*)file.c_str(), SPIF_UPDATEINIFILE);
+				}
+			}
+		}
+		else
+		{
+			setWallpaperStyle();
+			SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (void*)wallpaper.c_str(), SPIF_UPDATEINIFILE);
+		}
+	}
+}
+
 /*
 ** CopyFiles
 **

Library/System.h

@@ -82,6 +82,7 @@ public:
 	static void ResetWorkingDirectory();
 
 	static void SetClipboardText(const std::wstring& text);
+	static void SetWallpaper(const std::wstring& wallpaper, const std::wstring& style);
 
 	static bool CopyFiles(const std::wstring& strFrom, const std::wstring& strTo, bool bMove = false);
 	static bool RemoveFile(const std::wstring& file);