C / C++ / MFC

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

4-May-09 23:10

Cedric Moonen wrote:
Wow, your code seems to be wrong on so many points

My immediate reaction as well Sigh | :sigh:

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Stuart Dootson4-May-09 23:09

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

4-May-09 23:09

There are so many things wrong with attempting what you are that it's difficult to know where to start...

However, the main point is that std::map, std::string and std::vector all rely on pointers to external data. You do not have control over those pointers, so you cannot guarantee that they will lie within the mapped area of memory (unless you use specialised allocators, as documented here[^]).

mmayur wrote:
Can anyone suggest me a solution.

Your immediate problem here is a symptom of a bigger one. Tell us more about what you're trying to do and maybe we can suggest a solution to the bigger problem.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

mmayur6-May-09 0:46

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

6-May-09 0:46

Thanks for the reply.

sry for not providing proper information.

I'm facing a new problem of coping the contents from map to a map pointer.

pBuf = (std::map<string, FileInfo*> *)MapViewOfFile(hMapSharedMemory, FILE_MAP_ALL_ACCESS, 0, 0, 0);
std::map<string, FileInfo*> mapList;
I have to insert the mapList to pBuf.

Does insert or get_allocator resolve my problem.

Regards,
Mayur M

mmayur6-May-09 0:46

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

6-May-09 0:46

Thanks for the reply.

sry for not providing proper information.

I'm facing a new problem of coping the contents from map to a map pointer.

pBuf = (std::map<string, FileInfo*> *)MapViewOfFile(hMapSharedMemory, FILE_MAP_ALL_ACCESS, 0, 0, 0);

std::map<string, FileInfo*> mapList;

I have to insert the mapList to pBuf.

Does insert or get_allocator resolve my problem.

Regards,
Mayur M

Stuart Dootson6-May-09 0:52

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

6-May-09 0:52

As I said before...that's just not going to work. What problem are you trying to solve with this?

If you want to share/communicate a map between two or more processes using shared memory, look at Boost.Interprocess[^] - that has containers designed to be used in a shared memory area.

If you're just sending the map from one process to another, I'd serialize it - Boost.Serialization[^] is an option there.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

mmayur6-May-09 1:13

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

6-May-09 1:13

But right now i'm just looking for copying the contents of a map to map pointer. Nothing more than that

Stuart Dootson6-May-09 1:30

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

6-May-09 1:30

Are you seeing some relationship between the 'Map' in 'MapViewOfFile' and the 'map' in 'std::map'? Because if you are and that's why you're using std::map...well, there is no relationship between those two 'map's at all.

But that's the trouble - without telling us what you're trying to accomplish, we can't help you.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

mmayur8-May-09 0:15

Re: Error: Cannot convert from 'std::map<_Kty,_Ty> *' to 'LPCTSTR'

8-May-09 0:15

Hi,

Sorry for the improper title, which has created a lot of confusions.

I have a map of type

Std::map<string, FileInfo*> ActualMap;
Std::map<string, FileInfo*>::iterator mapIterator
Typedef std::pair <string, FileInfo*>;

The FileInfo is a class which contains the properties of the files.

I am inserting all the values properly into the ActualMap and then it has to be shared with another process in the same machine using the Named SharedMemory. So, I have implemented in following way

Std::map<string, fileinfo*=""> *pBuffer;
pBuffer = (std::map<string, fileinfo*=""> *)MapViewOfFile(hMapSharedMemory, FILE_MAP_ALL_ACCESS, 0, 0, 0);
once the above mapping of the view is done, I have inserted all the key-value from the ActualMap as

CopyMemory((PVOID) pBuf, &mapList, (mapList.size() * sizeof(std::map<string,FileInfo>)));

Now, in the client application i'm able to retireve only the size of the map but not the key-value pairs and their data.

So, please help in solving this problem.

Regards,
Mayur M

Stuart Dootson8-May-09 2:06

Default buttons changing for PropertySheet/PropertyPage

8-May-09 2:06

I would advise that you look at this (remarkably similar) thread[^].

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

aalexfree4-May-09 22:37

aalexfree

4-May-09 22:37

Is anybody know how to change default button (that will be activated by Enter) in PropertySheet/PropertyPage to some button on active page (not any of standart PropertySheet buttons - OK, Cancel or Apply)?

Casting

CodingLover4-May-09 22:20

CodingLover

4-May-09 22:20

Hi,

Can someone tell me how to convert BOOL in to System::String* __gc

I'm really wired with this... Frown | :(

Thanks a lot.

I appreciate your help all the time...
CodingLover Smile | :)

Rajesh R Subramanian4-May-09 22:33

Rajesh R Subramanian

4-May-09 22:33

Please ask it in the C++/CLI forum. This is the original C++ forum.

It is a crappy thing, but it's life -^ Carlo Pallini

CPallini4-May-09 22:37

CPallini

4-May-09 22:37

CodingLover wrote:
Can someone tell me how to convert BOOL in to System::String* __gc

I'm not sure I would ever ask such question, anyway, if I should, then I would ask it in the managed C++/CLI forum [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer4-May-09 23:06

4-May-09 23:06

I'll join in the chorus of "wrong forum!".

But before you ask the question there, think about it yourself.

You have two things:

1/ A BOOL. This is a thing which has two states, true or false. 1 or 0. Orange or green. I use BOOL to represent whether something is on or off. So, it could also mean "Give Iain Money" / "Give Iain Kisses".

2/ System::String * is some weird thing from another language. But it sounds a lot like a string. (I know, I'm a genius with psychic powers). So, it would be some sort of text representation.

So, you need to understand what that BOOL represents before you can turn it into text.

Start this conversation:

CodingLover's Mum: "Darling, what does this mean when it's on?"
CodingLover: "Ah, it means __________________________"
CodingLover's Mum: "Darling, what does this mean when it's off?"
CodingLover: "Ah, it means __________________________"

But you're not done... Try this conversation also:
CodingLover's Swedish Girlfriend: "Älskling, vad innebär det när den är på gång?"
CodingLover: "Ah, it means __________________________"
CodingLover's Swedish Girlfriend: "Älskling, vad innebär det när den är avstängd?"
CodingLover: "Ah, it means __________________________"

Text is a pain - for some reason, people all over the world like to use their own language, instead of God's Good English!

Iain.

ps, Power of google, my Svensk is far from good enough yet...

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job! http://cv.imcsoft.co.uk/[^]

CodingLover4-May-09 23:09

CodingLover

4-May-09 23:09

Thanks for the comment. I'm not an experienced person in C/C++, and that's why I ask a question here, after different things workout.

Anyway, I'll try my best next time what you are saying in the above post.

I appreciate your help all the time...
CodingLover Smile | :)

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer4-May-09 23:20

4-May-09 23:20

Well, the answer to your question isn't really a "how do I write this code" answer, it's a "what does this mean / how do I represent it to the user" question, and that will be the same whether you write in VB, FORTRAN, C, ruby, etc.

In my miniscule experience, the hard questions are not coding ones, they are deciding what to code...

Good luck,

Iain

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job! http://cv.imcsoft.co.uk/[^]

Cedric Moonen4-May-09 23:14

Cedric Moonen

4-May-09 23:14

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Stuart Dootson4-May-09 23:20

4-May-09 23:20

If you want to get a string value representing the BOOL, then this function ought to do you:

System::String^ GetStringFromBOOL(BOOL b)
{
   return Boolean(b!=FALSE).ToString();
}

This uses C++/CLR rather than Managed C++, which is why I have System::String^ rather than System::String* (^ is a managed pointer in C++/CLR).

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p