PIFile::openTemporary on Windows

PIPair from std::tuple

libs/main/io_devices/pifile.cpp

@@ -149,12 +149,15 @@ PIFile::PIFile(const PIString & path, PIIODevice::DeviceMode mode): PIIODevice(p
 
 bool PIFile::openTemporary(PIIODevice::DeviceMode mode) {
 	PIString tp;
+#ifdef WINDOWS
+	tp = PIDir::temporary().path() + PIDir::separator + "file" + PIString::fromNumber(randomi());
+#else
 	char * rc = tmpnam(0);
 	if (!rc) return false;
 	tp = rc;
-#ifdef WINDOWS
-	tp = PIDir::temporary().path() + PIDir::separator + "file" + tp.cutLeft(1).cutRight(1);
 #endif
+	while (isExists(tp))
+		tp += PIString::fromNumber(randomi() % 10);
 	return open(tp, mode);
 }