Rainmeter plugin for making taskbar translucent. http://arkenthera.deviantart.com/art/TranslucentTaskbar-1-0-656402039

PluginTranslucentTaskbar.cpp

#include <Windows.h>
#include "../../API/RainmeterAPI.h"

struct ACCENTPOLICY {
	int nAccentState;
	int nFlags;
	int nColor;
	int nAnimationId;
};
struct WINCOMPATTRDATA {
	int nAttribute;
	PVOID pData;
	ULONG ulDataSize;
};

enum AccentTypes {
	ACCENT_DISABLE = 0,
	ACCENT_ENABLE_GRADIENT = 1,
	ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
	ACCENT_ENABLE_BLURBEHIND = 3
};

bool IsWindows10() {
	OSVERSIONINFOA info;
	ZeroMemory(&info, sizeof(OSVERSIONINFOA));
	info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);

	GetVersionExA(&info);

	return info.dwMajorVersion == 10;
}

void SetBlurBehind(HWND hwnd, AccentTypes desiredType) {
	if (IsWindows10()) {
		const HINSTANCE hModule = LoadLibrary(TEXT("user32.dll"));
		if (hModule) {
			typedef BOOL(WINAPI*pSetWindowCompositionAttribute)(HWND,
				WINCOMPATTRDATA*);
			const pSetWindowCompositionAttribute
				SetWindowCompositionAttribute =
				(pSetWindowCompositionAttribute)GetProcAddress(
					hModule,
					"SetWindowCompositionAttribute");

			// Only works on Win10
			if (SetWindowCompositionAttribute) {
				ACCENTPOLICY policy =
				{ desiredType
				,0,desiredType == (ACCENT_ENABLE_TRANSPARENTGRADIENT) ? 255 : 0,0 };
				WINCOMPATTRDATA data = { 19,&policy,sizeof(ACCENTPOLICY) };
				SetWindowCompositionAttribute(hwnd, &data);
			}
			FreeLibrary(hModule);
		}
	}
	else {
		//Nothing
	}
}

HWND TaskbarHandle = FindWindow(L"Shell_TrayWnd", NULL);
HWND SecondaryTaskbar = FindWindow(L"Shell_SecondaryTrayWnd", NULL);


struct Measure
{
	AccentTypes State;

	Measure() : State(ACCENT_ENABLE_BLURBEHIND) {}
};

PLUGIN_EXPORT void Initialize(void** data, void* rm)
{
	Measure* measure = new Measure;
	*data = measure;
}

PLUGIN_EXPORT void Reload(void* data, void* rm, double* maxValue)
{
	Measure* measure = (Measure*)data;

	LPCWSTR value = RmReadString(rm, L"AccentState", L"");
	if (_wcsicmp(value, L"0") == 0)
	{
		measure->State = ACCENT_DISABLE;
	}
	else if (_wcsicmp(value, L"1") == 0)
	{
		measure->State = ACCENT_ENABLE_GRADIENT;
	}
	else if (_wcsicmp(value, L"2") == 0)
	{
		measure->State = ACCENT_ENABLE_TRANSPARENTGRADIENT;
	}
	else if (_wcsicmp(value, L"3") == 0)
	{
		measure->State = ACCENT_ENABLE_BLURBEHIND;
	}
	else
	{
		measure->State = ACCENT_ENABLE_BLURBEHIND;
	}
}

PLUGIN_EXPORT double Update(void* data)
{
	Measure* measure = (Measure*)data;

	SetBlurBehind(TaskbarHandle, measure->State);
	SetBlurBehind(SecondaryTaskbar, measure->State);

	SecondaryTaskbar = FindWindow(L"Shell_SecondaryTrayWnd", NULL);

	// Just in case 
	int GuardCounter = 0;
	while (SecondaryTaskbar = FindWindowEx(0, SecondaryTaskbar, L"Shell_SecondaryTrayWnd", L""))
	{
		if (GuardCounter > 8)
			break;
		SetBlurBehind(SecondaryTaskbar, measure->State);
		GuardCounter++;
	}
	return 0.0;
}

PLUGIN_EXPORT void Finalize(void* data)
{
	Measure* measure = (Measure*)data;

	SetBlurBehind(TaskbarHandle, ACCENT_DISABLE);
	SetBlurBehind(SecondaryTaskbar, ACCENT_DISABLE);

	SecondaryTaskbar = FindWindow(L"Shell_SecondaryTrayWnd", NULL);

	int GuardCounter = 0;
	while (SecondaryTaskbar = FindWindowEx(0, SecondaryTaskbar, L"Shell_SecondaryTrayWnd", L""))
	{
		if (GuardCounter > 8)
			break;
		SetBlurBehind(SecondaryTaskbar, ACCENT_DISABLE);
		GuardCounter++;
	}
	delete measure;
}

Hey man, for the 2 screen problem that a taskbar won't update. you need to reset the secondarytaskbar var after the while.

PLUGIN_EXPORT double Update(void* data)
{
	Measure* measure = (Measure*)data;

	SetBlurBehind(TaskbarHandle, measure->State);
	SetBlurBehind(SecondaryTaskbar, measure->State);

	SecondaryTaskbar = FindWindow(L"Shell_SecondaryTrayWnd", NULL);

	// Just in case 
	int GuardCounter = 0;
	while (SecondaryTaskbar = FindWindowEx(0, SecondaryTaskbar, L"Shell_SecondaryTrayWnd", L""))
	{
		if (GuardCounter > 8)
			break;
		SetBlurBehind(SecondaryTaskbar, measure->State);
		GuardCounter++;
	}
	SecondaryTaskbar = FindWindow(L"Shell_SecondaryTrayWnd", NULL);

	return 0.0;
}

Like so

Can you check out Lively? It is another Windows customization tool, and is open source. It provides all different taskbar customization features. You might want to look into its source code, though it is written in C# rather than C++.

i have a problem the task bar of windows still remains black pls fix

i have a problem the task bar of windows still remains black pls fix

@yuceltoluyag Go to Windows Settings, turn off transparency, and turn it back on. That fixes the problem for most cases.

If it doesn't, try turning the charging on and off if a laptop. Try switching the power saver and performance modes. If none of that works, then move on to looking for more solutions on the Internet and fiddle with the registry and drivers.

I've installed the translucent taskbar from deviantart and it flickers, what can i do? i tried doing
[TranslucentTaskbar]
Measure = Plugin
Plugin=TranslucentTaskbar
UpdateDivider=1
AccentState=2
but it didn't work

Is it possible to hide the line shown in the screenshot? Thanks!

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