Store a Vector as csv-File in a Mex File

Question

Christoph 2012-8-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46482-store-a-vector-as-csv-file-in-a-mex-file

Hi guys,

I have a small Problem with storing a Vector as CSV-File using a mex function. I my goal is an nice and tidy implementation. For that reason I tried the following code:

mdlStart
 FILE *PtrTextID = ssGetPWork(S,3); 
 PtrTextID = fopen("Storage.txt", "w");
mdlUpdate
 FILE *PtrTextID = ssGetPWork(S,3);
 fprintf(PtrTextID, "Test");
mdlTerminate
 FILE *PtrTextID = ssGetPWork(S,3);
 fclose(PtrTextID);
This code leads to a Matlab crash. But if I'm using 
mdlUpdate
 FILE *PtrTextID
 PtrTextID = fopen("Storage.txt", "w");
 fprintf(PtrTextID, "Test");
 fclose(PtrTextID);

the code works pretty well and do the thinks it's used to. Thats why my guess is that ssGetPWork is not the right workspace to store an FILE-Structure. But what is the right Workspace?

Thanks for your help, CN CN

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Kaustubha Govind 2012-8-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46482-store-a-vector-as-csv-file-in-a-mex-file#answer_56881

在 MATLAB Online 中打开

ssGetPWork takes only one input argument, and returns a void**. Also you need to initialize the number of PWorks first. I haven't tested this out, but I think your code should look like:

mdlInitializeSizes 
 ssSetNumPWork(S, 1);
mdlStart
 ssGetPWork(S)[0] = (void *)fopen("Storage.txt", "w");
mdlUpdate
 FILE *PtrTextID = (FILE *)(ssGetPWork(S)[0]);
 fprintf(PtrTextID, "Test");
mdlTerminate
 FILE *PtrTextID = (FILE *)(ssGetPWork(S)[0]);
 fclose(PtrTextID);

Note: ssGetPWork(S)[0] can be replaced with ssGetPWorkValue(S, 0)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Christoph 2012-8-23

Hi Kaustubha,

tanks for your excellent help. Your code just works perfect. As you mananged in your note I mixed up getting Values from the DWorkSpace and the PWorkSpace.

kind regards, CN

请先登录，再进行评论。