Use 32bit helper to interact between 32bit processes

QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.cpp

@@ -0,0 +1,88 @@
+// QuickLook.WoW64HookHelper.cpp : Defines the entry point for the application.
+//
+
+#include "stdafx.h"
+
+#include "QuickLook.WoW64HookHelper.h"
+#include <winuser.h>
+#include <cwchar>
+
+typedef void (__cdecl *PGCS)(PWCHAR);
+
+#define RUN_ARG L"033A853A-E4B2-4552-9A91-E88789761C48"
+
+#define SHARED_MEM_NAME L"QUICKLOOK_WOW64HOOKHELPER_MEM"
+#define MSG_WINDOW_CLASS L"QUICKLOOK_WOW64HOOKHELPER_MSG_CLASS"
+
+HMODULE pDll = nullptr;
+PGCS pGCS = nullptr;
+HWND hMsgWindow = nullptr;
+UINT WM_HOOK_NOTIFY = 0;
+
+int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
+                           _In_opt_ HINSTANCE hPrevInstance,
+                           _In_ LPWSTR lpCmdLine,
+                           _In_ int nCmdShow)
+{
+	// do not run when double-clicking
+	if (wcsstr(GetCommandLine(), RUN_ARG) == nullptr)
+	{
+		MessageBox(nullptr, L"This executable is not designed to launch directly.", L"QuickLook.WoW64HookHelper", 0);
+		return 0;
+	}
+
+	pDll = LoadLibrary(L"QuickLook.Native32.dll");
+	pGCS = reinterpret_cast<PGCS>(GetProcAddress(pDll, "GetCurrentSelection"));
+
+	WM_HOOK_NOTIFY = RegisterWindowMessage(L"WM_QUICKLOOK_HOOK_NOTIFY_MSG");
+
+	WNDCLASS wc = {};
+	wc.lpfnWndProc = WndProc;
+	wc.lpszClassName = MSG_WINDOW_CLASS;
+	if (!RegisterClass(&wc))
+		return 0;
+
+	hMsgWindow = CreateWindow(MSG_WINDOW_CLASS, nullptr, 0, 0, 0, 0, 0, HWND_MESSAGE, nullptr, nullptr, nullptr);
+	if (hMsgWindow == nullptr)
+		return 0;
+
+	MSG msg;
+	while (GetMessage(&msg, nullptr, 0, 0) > 0)
+	{
+		TranslateMessage(&msg);
+		DispatchMessage(&msg);
+	}
+	return msg.wParam;
+}
+
+LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+	if (msg == WM_HOOK_NOTIFY)
+	{
+		GetCurrentSelection();
+		return 0;
+	}
+	return DefWindowProc(hwnd, msg, wParam, lParam);
+}
+
+void GetCurrentSelection()
+{
+	WCHAR dllBuffer[MAX_PATH] = {'\0'};
+	pGCS(dllBuffer);
+
+	auto hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, SHARED_MEM_NAME);
+	if (hMapFile == nullptr)
+		return;
+
+	auto buffer = static_cast<PWCHAR>(MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, MAX_PATH * sizeof WCHAR));
+	if (buffer == nullptr)
+	{
+		CloseHandle(hMapFile);
+		return;
+	}
+
+	wcscpy_s(buffer, MAX_PATH, dllBuffer);
+
+	UnmapViewOfFile(buffer);
+	CloseHandle(hMapFile);
+}