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-2

i am the "proud" heir of an old VC++ DLL and try to understand a problem with it. My predecessor used some union/struct constructions for dataprocessing. Now i debugged it to a point he put the data in the struct, but the whole app crashes, printing a memory dump and no try-catch works.

A small CodeExample.

MyCode.h:

union
 
 struct 
 double _dm;
 ;
 struct 
 double _dm;
 bool _links;
 ;
 struct 
 double _dm;
 double _dummy;
 double _angle;
 ;
 struct 
 double _dm;
 double _angle;
 double _dummy1;
 string _name;
 string _descr;
 double _param_d1, _param_d2, _param_d5;
 double _dummy2;
 string _dummy3;
 int _epuzae;
 int _param_i2;
 string _sob, _snr2, _param_s3, _param_s4;
 void *_data;
 ;
 struct
 void *_data;
 ;
 

MyCode.cpp

... Rest of the method...
_dm = 100; // Will be set
_angle = 0; // Will be set
_dummy1 = 0; // Will be set
_name = "Unittest"; // Here it crashes the whole app
_descr = "This is a test";
_param_d1 = 1;
_param_d2 = 2;
_param_d5 = 5;
_dummy2 = 0;
_dummy3 = "";
_epuzae = 99;
_param_i2 = 101;
...

Is there a method to test what struct constructor is called or what i am doing wrong here?

Best regards

Lord_Pinhead

c++ visual-c++ visual-studio-2017

share|improve this question

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please add a minimal reproducible example. A union with a non trivial type in it (std::string in this case) is not trivial and requires a bunch of extra work on your part. You basically need to implement a tagged union. See: stackoverflow.com/questions/40106941/…
  
  – NathanOliver
  Mar 18 at 15:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what is string is it std::string?
  
  – rafael gonzalez
  Mar 18 at 15:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How is this union initialized?
  
  – Michael Kenzel
  Mar 18 at 15:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There are a huge number of ways a person can go horribly wrong with a union. We need to see how the union is being used to see how (or if) it is being abused.
  
  – user4581301
  Mar 18 at 15:17
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Rafael, yes it is a std::string Nathan I will try a tagged version thanks. I never used structs in c++, I have classes for that. Michael I kid you not, the second part is everything, no initialization. In Prod it somehow works. The guy was no programmer, he learned it with this app, so that is all I have for now. I make a unittest tomorrow and post a status.
  
  – Lord_Pinhead
  Mar 18 at 15:31
  

  
  
  
  

 | 
show 2 more comments

-2

i am the "proud" heir of an old VC++ DLL and try to understand a problem with it. My predecessor used some union/struct constructions for dataprocessing. Now i debugged it to a point he put the data in the struct, but the whole app crashes, printing a memory dump and no try-catch works.

A small CodeExample.

MyCode.h:

union
 
 struct 
 double _dm;
 ;
 struct 
 double _dm;
 bool _links;
 ;
 struct 
 double _dm;
 double _dummy;
 double _angle;
 ;
 struct 
 double _dm;
 double _angle;
 double _dummy1;
 string _name;
 string _descr;
 double _param_d1, _param_d2, _param_d5;
 double _dummy2;
 string _dummy3;
 int _epuzae;
 int _param_i2;
 string _sob, _snr2, _param_s3, _param_s4;
 void *_data;
 ;
 struct
 void *_data;
 ;
 

MyCode.cpp

... Rest of the method...
_dm = 100; // Will be set
_angle = 0; // Will be set
_dummy1 = 0; // Will be set
_name = "Unittest"; // Here it crashes the whole app
_descr = "This is a test";
_param_d1 = 1;
_param_d2 = 2;
_param_d5 = 5;
_dummy2 = 0;
_dummy3 = "";
_epuzae = 99;
_param_i2 = 101;
...

Is there a method to test what struct constructor is called or what i am doing wrong here?

Best regards

Lord_Pinhead

c++ visual-c++ visual-studio-2017

share|improve this question

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please add a minimal reproducible example. A union with a non trivial type in it (std::string in this case) is not trivial and requires a bunch of extra work on your part. You basically need to implement a tagged union. See: stackoverflow.com/questions/40106941/…
  
  – NathanOliver
  Mar 18 at 15:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what is string is it std::string?
  
  – rafael gonzalez
  Mar 18 at 15:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How is this union initialized?
  
  – Michael Kenzel
  Mar 18 at 15:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There are a huge number of ways a person can go horribly wrong with a union. We need to see how the union is being used to see how (or if) it is being abused.
  
  – user4581301
  Mar 18 at 15:17
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Rafael, yes it is a std::string Nathan I will try a tagged version thanks. I never used structs in c++, I have classes for that. Michael I kid you not, the second part is everything, no initialization. In Prod it somehow works. The guy was no programmer, he learned it with this app, so that is all I have for now. I make a unittest tomorrow and post a status.
  
  – Lord_Pinhead
  Mar 18 at 15:31
  

  
  
  
  

 | 
show 2 more comments

i am the "proud" heir of an old VC++ DLL and try to understand a problem with it. My predecessor used some union/struct constructions for dataprocessing. Now i debugged it to a point he put the data in the struct, but the whole app crashes, printing a memory dump and no try-catch works.

A small CodeExample.

MyCode.h:

union
 
 struct 
 double _dm;
 ;
 struct 
 double _dm;
 bool _links;
 ;
 struct 
 double _dm;
 double _dummy;
 double _angle;
 ;
 struct 
 double _dm;
 double _angle;
 double _dummy1;
 string _name;
 string _descr;
 double _param_d1, _param_d2, _param_d5;
 double _dummy2;
 string _dummy3;
 int _epuzae;
 int _param_i2;
 string _sob, _snr2, _param_s3, _param_s4;
 void *_data;
 ;
 struct
 void *_data;
 ;
 

MyCode.cpp

... Rest of the method...
_dm = 100; // Will be set
_angle = 0; // Will be set
_dummy1 = 0; // Will be set
_name = "Unittest"; // Here it crashes the whole app
_descr = "This is a test";
_param_d1 = 1;
_param_d2 = 2;
_param_d5 = 5;
_dummy2 = 0;
_dummy3 = "";
_epuzae = 99;
_param_i2 = 101;
...

Is there a method to test what struct constructor is called or what i am doing wrong here?

Best regards

Lord_Pinhead

c++ visual-c++ visual-studio-2017

share|improve this question

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

union
 
 struct 
 double _dm;
 ;
 struct 
 double _dm;
 bool _links;
 ;
 struct 
 double _dm;
 double _dummy;
 double _angle;
 ;
 struct 
 double _dm;
 double _angle;
 double _dummy1;
 string _name;
 string _descr;
 double _param_d1, _param_d2, _param_d5;
 double _dummy2;
 string _dummy3;
 int _epuzae;
 int _param_i2;
 string _sob, _snr2, _param_s3, _param_s4;
 void *_data;
 ;
 struct
 void *_data;
 ;
 

... Rest of the method...
_dm = 100; // Will be set
_angle = 0; // Will be set
_dummy1 = 0; // Will be set
_name = "Unittest"; // Here it crashes the whole app
_descr = "This is a test";
_param_d1 = 1;
_param_d2 = 2;
_param_d5 = 5;
_dummy2 = 0;
_dummy3 = "";
_epuzae = 99;
_param_i2 = 101;
...

share|improve this question

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

share|improve this question

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

asked Mar 18 at 15:06

Lord_PinheadLord_Pinhead

5088 bronze badges

1 Answer
1

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0

After to much trouble and helpfull links why not use struct with strings, i refactored it yesterday to a class, what runs like a charme:

 class DPic 
public:
 DPic();
 ~DPic();

 double DM;
 double Angle;
 std::string Name;
 std::string Descr;
 double Param_d1, Param_d2, Param_d5;
 int Epuzae;
 int Param_i2;
 std::string Sob, Snr2, Param_s3, Param_s4;
 void *_data;
;

So if anybody ever find this in his code, just throw it out and use proper classes or membervariables.

share|improve this answer

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

add a comment | 

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0

After to much trouble and helpfull links why not use struct with strings, i refactored it yesterday to a class, what runs like a charme:

 class DPic 
public:
 DPic();
 ~DPic();

 double DM;
 double Angle;
 std::string Name;
 std::string Descr;
 double Param_d1, Param_d2, Param_d5;
 int Epuzae;
 int Param_i2;
 std::string Sob, Snr2, Param_s3, Param_s4;
 void *_data;
;

So if anybody ever find this in his code, just throw it out and use proper classes or membervariables.

share|improve this answer

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

add a comment | 

0

After to much trouble and helpfull links why not use struct with strings, i refactored it yesterday to a class, what runs like a charme:

 class DPic 
public:
 DPic();
 ~DPic();

 double DM;
 double Angle;
 std::string Name;
 std::string Descr;
 double Param_d1, Param_d2, Param_d5;
 int Epuzae;
 int Param_i2;
 std::string Sob, Snr2, Param_s3, Param_s4;
 void *_data;
;

So if anybody ever find this in his code, just throw it out and use proper classes or membervariables.

share|improve this answer

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

add a comment | 

After to much trouble and helpfull links why not use struct with strings, i refactored it yesterday to a class, what runs like a charme:

 class DPic 
public:
 DPic();
 ~DPic();

 double DM;
 double Angle;
 std::string Name;
 std::string Descr;
 double Param_d1, Param_d2, Param_d5;
 int Epuzae;
 int Param_i2;
 std::string Sob, Snr2, Param_s3, Param_s4;
 void *_data;
;

So if anybody ever find this in his code, just throw it out and use proper classes or membervariables.

share|improve this answer

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

 class DPic 
public:
 DPic();
 ~DPic();

 double DM;
 double Angle;
 std::string Name;
 std::string Descr;
 double Param_d1, Param_d2, Param_d5;
 int Epuzae;
 int Param_i2;
 std::string Sob, Snr2, Param_s3, Param_s4;
 void *_data;
;

share|improve this answer

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges

answered Mar 26 at 10:45

Lord_PinheadLord_Pinhead

5088 bronze badges