解释一下：char binFileDir[256];
		char* fileNamePos;
		GetModuleFileName(NULL, binFileDir, 256);
		fileNamePos = strrchr(binFileDir, '\\');
		*(fileNamePos + 1) = '\0';
		strcat(binFileDir, g_log_file_name);

		err = fopen_s(&g_fp,binFileDir,"a+"); 