Test

shared/WULog.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "stdafx.h"
+#include <windows.h>
+#include <shlobj.h>
+#include "Exec.h"
+#include "HResult.h"
+#include "VersionInfo.h"
+
+static inline HRESULT ViewWindowsUpdateLog(int nCmdShow) {
+	WCHAR windir[MAX_PATH];
+	HRESULT hr = SHGetFolderPath(0, CSIDL_WINDOWS, NULL, 0, windir);
+	if (!SUCCEEDED(hr)) {
+		TRACE(L"SHGetFolderPath() failed: %ls\n", GetMessageForHresult(hr));
+		return hr;
+	}
+
+	LPWSTR workDir = windir;
+
+	if (AtLeastWin10()) {
+		// Windows 10 moves WU/USO logs to ETW. The ETW logs can be converted back to a plain-text .log
+		// using a cmdlet.
+		WCHAR powershell[MAX_PATH];
+		ExpandEnvironmentStrings(L"%SystemRoot%\\System32\\WindowsPowerShell\\v1.0\\powershell.exe", powershell, ARRAYSIZE(powershell));
+
+		DWORD code;
+		HRESULT hr = Exec(NULL, powershell, L"-Command Get-WindowsUpdateLog", windir, nCmdShow, TRUE, &code);
+		if (!SUCCEEDED(hr) || code != 0) {
+			return hr;
+		}
+
+		// On success, the log is written to Desktop\WindowsUpdate.log.
+		WCHAR desktop[MAX_PATH];
+		hr = SHGetFolderPath(0, CSIDL_DESKTOP, NULL, 0, desktop);
+		if (!SUCCEEDED(hr)) {
+			TRACE(L"SHGetFolderPath() failed: %ls\n", GetMessageForHresult(hr));
+			return hr;
+		}
+
+		workDir = desktop;
+	}
+
+	return Exec(L"open", L"WindowsUpdate.log", NULL, workDir, nCmdShow, FALSE, NULL);
+}