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First I appreciate your answer. But What I really want to know is, if it is a good idea to use a Grid that resides in a DLL. And if so How do I create an Object of it. I did this but with MFC and the autogenerated wrapper classes and everything works OK but I don`t know how to use it in a ATL/WTL project. This is because if I try to use the generated class I get some error about undefined class.
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How do I set my combos height wich resides in a DialogBox
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First make a call GetDlgItem with the handle of the parent dialog and the ID of your combo box. This will return a handle to the combo box to you.
You can then use that handle in a call to MoveWindow to resize and move the combo box.
Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!
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The problem is when I click on the combos down arrow, it won`t display the list. The list does contains some items. But I can`t see them.
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Bring up your dialog in the resource editor. Click on the dropdown and pull the sizing box downward to the size you want.
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Thakn you for your answer.
Seems like everything it`s dificult not knowing how to do it
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Is there some article that demonstrates the use of one STL container inside another?
for example, how to use
std::map<std::string, std::vector<std::string> > x;
ie, how do i insert?
how do i get back the reference of the vector instead of copying it out?
etc.
Thomas
modified 29-Aug-18 21:01pm.
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maybe multimap is a better fit for what you want here?
but, here is a code snippette that may be worth while though:
...
// define types
//
using namespace std;
typedef vector<string> STRING_LIST;
typedef map< string, STRING_LIST* > MAP_STRING_TO_LIST;
typedef MAP_STRING_TO_LIST::iterator MAP_STRING_TO_LIST_ITER;
// declare variable of type
//
MAP_STRING_TO_LIST oMyList;
bool InsertString( string oKey, string oValue )
{
MAP_STRING_TO_LIST_ITER oIter = oMyList.find( oKey );
if ( oMyList.end() == oIter )
{
// no entry yet for this key...
//
STRING_LIST* poList = new STRING_LIST;
poList->push_back( oValue );
oMyList.insert( MAP_STRING_TO_LIST::value_type( oKey, poList );
}
else
{
STRING_LIST* poList = (*oIter).second;
poList->push_back( oValue );
}
}
hope that helps
Just trying to keep the forces of entropy at bay
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I can't recieve WM_CREATE message in my control . How could this happen? What are the possible reasons?
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You might need to set the following variable in your constuctor
CComControlBase::m_bWindowOnly = TRUE;
Todd Smith
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If it's dialogbased control, you should receieve WM_INITDIALOG instead.
--
Please state the nature of your medical emergency.
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I've come across an interesting problem, that I can't find a nice clean solution to.
The problem is how to manage adding and deleting objects from two vectors containing different objects.
Here's what I've got: A list of objects that contain an vector of ints as data points. The object holding the list has an vector of description objects containing information about each of the ints in the vector. They have a one to one relationship.
Now, I need to support adding or removing data points. What I can't figure out how to do is how to do this without a lot of overhead. My first thought was that I'd simply get the position of the data point description object that was added, then simply do a for_each over the list and call insert or erase for the appropriate position in the data points vector as required by the operation. Unfortunately both of those functions require an iterator to the item being erased, or the position the new item is being inserted at, not just it's index position.
Is there a way to do this without iterating over each data point vector? Since the position in the vector is going to be the same for all the objects, it seems like there should be a way to do this without all the manipulation.
Any ideas?
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Mark Tutt wrote:
Here's what I've got: A list of objects that contain an vector of ints as data points. The object holding the list has an vector of description objects containing information about each of the ints in the vector. They have a one to one relationship.
Why didn't you make a map in this case ? a map of <DataPoints,DescriptObj> ????? or if Description objects must be a vector of points ...
<DataPoints,vector<DescriptObj>> ?
So you want to remove a specific data point , it's enough to reference the data point .
Cheers,Joao Vaz
And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary.-Shog9
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If I'm understanding your question, it was to avoid the memory overhead of needing the have the description objects for each of the data point vectors.
A map would involve copies of the objects, greatly increasing memory requirements. There may be 10's or 100's of thousands of data point vectors, and I only need one set of description objects. Even having a pointer to the associated description object for each data point essentially doubles the memory requirements.
Mark
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And why not use instead vector of pointers to Data Points ?
Cheers,Joao Vaz
And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary.-Shog9
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I think you're missing the point of what I was trying to do...
Think of rows in a database table. All you need is the data, stored in rows, in a sequential list that you can move through. (leaving out indexing for now)
The column information, i.e. Name, data type, default value, nullable, etc. is going to be the same for every row in the table. You don't need to carry the weight of that data along with each row, so you just have one copy of this for the table.
Now assume you've got a doubly linked list containing vectors (rows) of 10 integers each. You've got another vector that contains the column information for the 10 columns.
If you want to delete the 8th column, you've got to delete the 8th int from each row in the list.
If you were to add pointers to the integers, you're not really changing the basic requirement of the operation, and you're adding additional memory overhead of a 32byte pointer to a 32byte int, i.e. doubling the memory requirement.
What someone else pointed out was that given that we know the position in our column information vector, we can use datapoint.begin()+pos to get the datapoint iterator to the datapoint position that we have to erase, so we can do something like this to perform a 'column delete' operation on our entire dataset.
for_each(datalist.begin(), datalist.end, erase(data.begin()+pos))
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You can have constant-time access to the n-th element of a vector v via the iterator v.begin()+n. I agree with you that proably std::vector is the best choice for holding huge arrays of ints. As for the description list, you'd probably be better off using a std::map<int,CDescription>. Access is log-time given the position, and insertions and deletions are way cheaper.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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v.begin()+n was the answer I needed! Thanks!
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Mark Tutt wrote:
v.begin()+n
Shi***t !!!!!!!! So that was that !!!!! *grin* (banging the head against the table)
Cheers,Joao Vaz
And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary.-Shog9
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Hello,
I’m facing some problem when I want to send the ICommand interface to the Client to work around the data fetched from the Database by OLEDB provider. I can successfully query the database and traverse through the Rowset at the Server end. When I’m packing the ICommand interface in a variant (as dispatch), at the Client End it throws the Error “No such interface supported”).
Here is the excerpt from my code
HRESULT CDAC::GetCommand (BSTR bstrQuery, VARIANT *pvarColumnInfo, VARIANT *pvarCmd)
{
HRESULT hr;
CSession session;
CCommand<cdynamicaccessor, crowset=""> objCmd;
LONG lRetVal;
try
{
USES_CONVERSION;
// Getting the Database connection by using the connection string
lRetVal = GetDBConnection();
// Creating the session for the transaction
hr = session.Open(m_objDBSrc);
CHECK_HR(hr);
// Create the Command by using the session for the query
hr = objCmd.Create(objSession, bstrQuery);
CHECK_HR(hr);
// Command Optimization
hr = objCmd.Prepare();
CHECK_HR(hr);
// Execute the Command
hr = objCmd.Open();
CHECK_HR(hr);
// Place the column Information in the OUT VARIANT
pvarColumnInfo->vt = VT_BYREF;
pvarColumnInfo ->byref = (PVOID)cmdObj.m_pColumnInfo;
// Place the command object in the OUT VARIANT
pvarCmd->vt = VT_DISPATCH;
pvarCmd->pdispVal = (IDispatch*)cmdObj.m_spCommand.Detach();
// Unable to get the ICommand, return the error
if(pvarCmd ->pdispVal == NULL)
{
hr = E_FAIL;
goto CLEANUP;
}
}
catch(_com_error &ce)
{
ERRBOX(ce.ErrorMessage(), "Error");
hr = ce.Error();
goto CLEANUP;
}
catch(...)
{
ERRBOX("Unknown Error", "Error");
hr = E_UNEXPECTED;
goto CLEANUP;
}
// Successfully Completed. Return Success code.
hr = S_OK;
CLEANUP:
return hr;
}
Can anyone suggest that where I’m failing or how to pass the Command information from the Server to Client?
Advance thanks,
Regards,
Ramesh M.
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Try using QueryInterface to get the IUnknown of the cmd interface, and pass that through in your variant as an IUnknown, then at the client end use QueryInterface to get the ICommand interface back.
Steve S
[This signature space available for rent]
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I've written a dll with ATL.I want to use it in Delphi.Is that possible?
Mazy
"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down
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Yes, you must make sure that the exported function have the same signature when you try to call them from delphi (i.e. make them __stdcall, _cdecl etc.)
Best regards,
Alexandru Savescu
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Why sometimes vc++ couldn't find atlres.h ??
How to solve this problem !? 
----------------------------
i am a beginner.
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Mandalay wrote:
Why sometimes vc++ couldn't find atlres.h ??
Because you don't have WTL, or don't have the files in your INCLUDE path. See the VC forum FAQ, there's a FAQ on this topic.
--Mike--
Just released - RightClick-Encrypt v1.4 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm
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