修改设备互斥32位与64位交互BUG；设备打开失败返回真实的错误代码

hgdriver/hgdev/hg_ipc.cpp

@@ -337,7 +337,7 @@ std::string shared_memory::read(void)
 
 	std::string ret("");
 	size_t	len = 0;
-	int		off = sizeof(size_t);
+	int		off = 4;	// sizeof(size_t);
 
 	memcpy(&len, buf, off);
 	ret = std::string(buf + off, len);
@@ -351,7 +351,7 @@ int shared_memory::write(const char* data, size_t len)
 		return SCANNER_ERR_INSUFFICIENT_MEMORY;
 
 	char* buf = get_buf();
-	int off = sizeof(len);
+	int off = 4;	// sizeof(len);
 	if (buf == (char*)-1)
 		return errno;
 

hgsane/sane_hg_mdw.cpp

@@ -774,7 +774,7 @@ SANE_Status hg_sane_middleware::open(SANE_String_Const devicename, SANE_Handle*
 		return SANE_STATUS_ACCESS_DENIED;
 	}
 	else
-		return SANE_STATUS_UNSUPPORTED;
+		return (SANE_Status)err;	// SANE_STATUS_UNSUPPORTED;
 }
 SANE_Option_Descriptor* hg_sane_middleware::from_json(scanner_handle h, json* jsn, int opt_no)
 {