Added simple logging

wCenterWindow/Logger.cpp

@@ -0,0 +1,57 @@
+// Logger.cpp
+//
+#include <fstream>
+#include <filesystem>
+#include <string>
+#include <strsafe.h>
+#include <Windows.h>
+#include "Logger.h"
+
+#define TS_LEN 30
+#define PATH_LEN 1024
+
+std::wofstream logfile;
+namespace fs = std::filesystem;
+
+std::wstring GetTimeStamp() {
+	SYSTEMTIME lt;
+	GetLocalTime(&lt);
+	wchar_t ts[TS_LEN];
+	StringCchPrintf(ts, TS_LEN, L"%d-%02d-%02d %02d:%02d:%02d.%03d - ", lt.wYear, lt.wMonth, lt.wDay, lt.wHour, lt.wMinute, lt.wSecond, lt.wMilliseconds);
+	return ts;
+}
+
+void OpenLogFile() {
+	wchar_t lpszPath[PATH_LEN]{};
+	DWORD dwPathLength = GetModuleFileName(NULL, lpszPath, PATH_LEN);
+	DWORD dwError = GetLastError();
+	if (ERROR_INSUFFICIENT_BUFFER == dwError) {
+		MessageBoxW(NULL, L"Path to logfile is too long! Working without logging.", L"WARNING", MB_OK | MB_ICONWARNING);
+		return;
+	}
+	if (NULL == dwPathLength) {
+		MessageBoxW(NULL, L"Can't get module filename! Working without logging.", L"WARNING", MB_OK | MB_ICONWARNING);
+		return;
+	}
+
+	fs::path log_path = lpszPath;
+	log_path.replace_extension(L".log");
+	std::wstring logname = log_path.stem() += L".log";
+
+	logfile.open(logname);
+	if (logfile.is_open()) {
+		diag_log(L"Starting logging.");
+		diag_log(L"logfile:", logname);
+		diag_log(logname, L"successfully opened.");
+	} else {
+		MessageBoxW(NULL, L"Can't open logfile! Working without logging.", L"WARNING", MB_OK | MB_ICONWARNING);
+	}
+	return;
+}
+
+void CloseLogFile() {
+	if (logfile) {
+		diag_log(L"Ending logging.");
+		logfile.close();
+	}
+}