HideTaskbar.cpp

#include <string>
#include <vector>
#include <Windows.h>
#include <print>

const BYTE ALPHA_HIDE = 0;
const BYTE ALPHA_SHOW = 255;

std::vector<HWND> global_windows;

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam) {
    const std::wstring& targetClass = *reinterpret_cast<std::wstring*>(lParam);

    wchar_t className[256];
    if (GetClassNameW(hwnd, className, 256) > 0) {
        if (targetClass == className) {
            global_windows.push_back(hwnd);
        }
    }

    return TRUE;
}

std::vector<HWND> FindWindowsByClass(const std::wstring& class_name) {
    global_windows.clear();
    EnumWindows(EnumWindowsProc, reinterpret_cast<LPARAM>(&class_name));
    return global_windows;
}

void SetWindowAlpha(HWND window_handle, BYTE alpha) {
    SetWindowLong(window_handle, GWL_EXSTYLE, GetWindowLong(window_handle, GWL_EXSTYLE) | WS_EX_LAYERED);
    SetLayeredWindowAttributes(window_handle, 0, alpha, LWA_ALPHA);

    RedrawWindow(window_handle, NULL, NULL, RDW_ERASE | RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN);
}

std::vector<HWND> GetAllTaskbarWindows() {
    auto primary_windows = FindWindowsByClass(L"Shell_TrayWnd");
    auto secondary_windows = FindWindowsByClass(L"Shell_SecondaryTrayWnd");

    primary_windows.insert(primary_windows.end(), secondary_windows.begin(), secondary_windows.end());

    return primary_windows;
}

void SetTaskbarsHidden(bool hidden) {
    auto window_handles = GetAllTaskbarWindows();
    
    for (auto handle : window_handles) {
        SetWindowAlpha(handle, hidden ? ALPHA_HIDE : ALPHA_SHOW);
    }
}

int main(int argc, char* argv[])
{
    std::string hide {"--hide"};
    std::string show {"--show"};
    
    if(argv[1] != nullptr && (argv[1] != hide && argv[1] != show)){
        std::print("Ingresar un argumento válido:\n\t--hide, Sin argumentos\tEsconder la barra de tareas\n\t--show\t\t\tMostrar la barra de tareas\n");
        return 0;
    }

    if (argv[1] == nullptr || argv[1] == hide) {
        SetTaskbarsHidden(true);
        return 0;
    }

    if (argv[1] == show) {
        SetTaskbarsHidden(false);
        return 0;
    }
}