calling a dll

2011 7 11
2 个回答
回答已采纳
7 次查看（30 天）

0 个投票

I wish to call my dll (simpledll)from Matlab R2007b; I have loaded the dll successfully. Then from the 'libfunctions' I get the function: "doublePtr changevar(double, doublePtr)" displayed. This looks ok to me, as all it does is inputs a value (double) & returns a value (double).
I tried calling it using the following: in1=2; [out1]=callib('simpledll','changevar',in1);
But I get the following error on the calling line: "Undefined function or method 'callib' for input arguments of type 'char'."
What does this mean; have I got the format for calling the dll wrong; what should I have put?

请先登录，再回答此问题。

 采纳的回答

Friedrich
Friedrich 2011-7-11

1 个投票

Hi,
this be because calllib is written with three l instead of two like you did.

2 个评论
显示 无 隐藏 无

Steve
Steve 2011-7-11
Yes you are correct;MatLab did not highlight the typo error. I have corrected this but now get the error message "Error using==> calllib
No method with matching signature". Any ideas what this means?
Kaustubha Govind
Kaustubha Govind 2011-7-11
doublePtr changevar(double, doublePtr)
this seems to indicate that the function needs two inputs, but you are only providing one.

请先登录，再进行评论。

更多回答（1 个）

Steve
Steve 2011-7-11

0 个投票

Yes you are correct;MatLab did not highlight the typo error. I have corrected this but now get the error message "Error using==> calllib No method with matching signature". Any ideas what this means?

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Friedrich
Friedrich 2011-7-11
Your function changevar expects two inputs but you pass only one input which leads the error that no function with matching structure is found, since you dont have a function called changevar which expects one input.
Steve
Steve 2011-9-27
The dll (simpledll)has a function called 'changevar' with one input 'in1' and one output 'out1'. So have I got the MatLab format wrong: [out1]= calllib('simpledll','changevar',in1)?
Kaustubha Govind
Kaustubha Govind 2011-9-27
You said that libfunctions lists the function as "doublePtr changevar(double, doublePtr)" - this indicates that the function has 2 inputs. What is the corresponding signature for the function with one input?

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Call C from MATLAB 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by