如何在DLL中共享数据段:问题: [英] How to share a data segment in a DLL: problem:

问题描述

我有这种情况:

程序A，它向mysql客户端发送一个sql查询，该客户端依次(在更新表T事件上)触发dll B中用户定义的函数，后者会更新变量v.
程序A然后使用同一个dll B的另一个函数来读取变量v.

按照您在文章如何在DLL中共享数据段"中所述的技术，在共享数据段中声明变量v.

我在dll中实现了函数来设置和获取v的值.

我的工作是在通过远程查询更新表T时实现程序A变量v的自动更新.

碰巧，由于没有共享v，所以mysql客户端对v的修改不会在程序A中反映出来，反之亦然.

但是，如果我使用程序A的两个(或多个)实例或mysql客户端的两个(或多个)实例而不是程序A和mysql客户端执行测试，则一切正常.

请帮忙.

D.Iracà
意大利比萨
电子邮件地址已删除

I have this situation:

program A which sends a sql query to a mysql client which in turns triggers (on update table T event) a user defined function in a dll B which updates a variable v.

program A then uses another function of the same dll B to read the variable v.

The variable v is declared in a shared data segment following the tecnique you describe in the article "How to share a data segment in a DLL".

I implemented functions in the dll to set and get the value of v.

My effort is to implement automatic update of the program''s A variable v when the table T is updated by a remote query.

It happens that the modification of v made by the mysql client don''t reflect themselves in program A and viceversa, as v was not shared.

But the things work fine if I perform a test with two (or more) instances of program A or two (or more) instances of the mysql client, instead of program A and mysql client.

Please help.

D.Iracà
Pisa Italy
Email address removed

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