ATL / WTL / STL

storage of employee objects in a container

5-Mar-07 6:05

xelontr wrote:
BSTR* t;

inp->get_m_input(t);

Probably, this function is expecting variable with memory allocated, modify this code to this and try,

BSTR t;
inp->get_m_input(&t);

Prasad
Notifier using ATL | Operator new[],delete[][^]

The Bat Man1-Mar-07 5:46

The Bat Man

1-Mar-07 5:46

I want to store a group of employee objects in an array or collection of some type and then be able to find which employees are of a certain department number. For example there may be a total of 10 employees with 4 of the employees belonging to department 1 and the rest to various other departments, I want to be able to find all of the employees belonging to department 1 and print those out. What do you think is the best way to do this? I tried to use a vector sequence container, but I don't know how I would find multiple employee objects depending on dept number attribute.

Any help would be greatly appreciated,
Jason

Steve S1-Mar-07 6:44

Steve S

1-Mar-07 6:44

You could have a map containing vectors. The map key would be the department number, and the data would be a vector (or better, a pointer to a vector) of employees.

Steve S
Developer for hire

The Bat Man1-Mar-07 8:36

The Bat Man

1-Mar-07 8:36

But what if there were multiple map key's (department number's) that are the same? It would only show the first occurance, right? Is there a way I can show all objects of that same key?

Thanks,
Jason

Re: storage of employee objects in a container [modified]

Steve S1-Mar-07 21:23

Steve S

1-Mar-07 21:23

Do you mean that there are multiple departments with the same number, or that there are multiple employees in the same department?

If the former, then you cannot use department number as a key, since you cannot be sure which distinct department you should be referring to.

If the latter, that's why the data is a vector, so you can add multiple employees.

Steve S
Developer for hire

The Bat Man2-Mar-07 4:49

The Bat Man

2-Mar-07 4:49

The latter, multiple employees in the same department. How would I use a vector inside of a map? I tried the following example but received an error C2665 'std::pair<_Ty1,_Ty2>::__ctor' : none of the 3 overloads can convert parameter 2 from type 'const char [5]'

<code>
typedef map<int, vector<string> > EmployeeType;

void MapVectorTest()
{
EmployeeType theMap;
EmployeeType::iterator theIterator;

theMap.insert(EmployeeType::value_type(0, "Zero")); // error C2665
}
</code>

-- modified at 14:43 Friday 2nd March, 2007

Thanks,
Jason

-- modified at 14:48 Friday 2nd March, 2007

specialization of STL-map

kalkwarf1-Mar-07 12:15

kalkwarf

1-Mar-07 12:15

A multimap will allow you to have multiple values per key.

Dave

std::string

LCI1-Mar-07 3:19

LCI

1-Mar-07 3:19

I am reading from a file after opening using this command

ReadFile(hFile,&strData, 300, &dwbytes, NULL); in a C++ dll

strData is defined as a std::string

say std::string test = strData;

After executing the above command, i get an error .. something about misaligned string. I am not sure what could be going on here. When i debug and watch the values i see strData as {???} but then when i drill down, i actually see the correct data read from the file, but it seems like something is wrong such that strData cannot be accessed

Re: std::string

Michael Dunn1-Mar-07 5:48

Michael Dunn

1-Mar-07 5:48

Windows APIs know nothing about C++ objects. You have to pass ReadFile() an array of BYTEs, then take that data and put it in a string.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Ford, what's this fish doing in my ear?

Mr.Brainley23-Feb-07 4:28

Mr.Brainley

23-Feb-07 4:28

I want to write a specialization of the map-class. I just want to synchronize access to the map in memory, the rest should stay the same. Is there any way to achieve that without completely rewriting the class ? Maybe something like accessing the 'base-class'-method ?

Re: specialization of STL-map

Mr.Brainley23-Feb-07 4:56

Mr.Brainley

23-Feb-07 4:56

Got it ! I just have to create a custom map that internally keeps a STL-map. Then i can implement all the functions i need and wrap synchronization around them. It's just too simpel.

Warnings in my project

Pankaj.Jain23-Feb-07 0:59

Re: Warnings in my project

23-Feb-07 0:59

Hi All
I m working on a ATL project. There are a lot of warnings as

warning C4653: compiler option 'Optimizations (one or more of /Oawstgp[y]) or debug checks (one or more of /GZ, /RTCcsu)' inconsistent with precompiled header; current command-line option ignored

warning C4651: '/D__MSVC_RUNTIME_CHECKS' specified for precompiled header but not for current compile

Can anybody describe why it is?

Thanks

Pankaj Jain

Stuart Dootson23-Feb-07 8:17

Stuart Dootson

23-Feb-07 8:17

Sounds like you've changed compiler options somehow - do a Build->Rebuild - that should do it.

How to Add String in MultiColumn ListBox

Pankaj.Jain22-Feb-07 0:04

22-Feb-07 0:04

Hi All
I m working on a ATL Project. I have to add string in a multi column List box using SendDlgItemMessage() but I dont get any idea about that.
I m using it like this

SendDlgItemMessage(IDC_LIST1, LB_INSERTSTRING, (WPARAM) 0, (LPARAM)"Hi");
SendDlgItemMessage(IDC_LIST1, LB_INSERTSTRING, (WPARAM) 1, (LPARAM)"All");

But it is not working. I want to Add "Hi" in one column and "All" other.
If u have any Idea Please suggest me

Thanks & Regards
Pankaj Jain

prasad_som22-Feb-07 1:04

22-Feb-07 1:04

PK Jain wrote:
But it is not working.

What is exact problem ?

PK Jain wrote:
I want to Add "Hi" in one column and "All" other.

WPARAM value refers to item index, not column index.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Pankaj.Jain22-Feb-07 1:49

22-Feb-07 1:49

Thanks,
But my query is not solved
How to Add String in MultiColumn ListBox using SendDlgItemMessage

Pankaj Jain

prasad_som22-Feb-07 2:13

22-Feb-07 2:13

PK Jain wrote:
But my query is not solved

For that you need to answer questions asked. I asked, what do you mean by not working ?

PK Jain wrote:
How to Add String in MultiColumn ListBox using SendDlgItemMessage

Same as you written in in your original post.

I think you mistaken multicolumn with number of columns as in list box. In case of list box, multi column means, there will be no vertical scrolling as number of string keeps increasing.
Instead, string will be added to next column and so on, and horizontal scroll bar will appear.
I hope this clear your doubts.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Pankaj.Jain22-Feb-07 18:45

Re: How to Add String in MultiColumn ListBox [modified]

22-Feb-07 18:45

Thanks Prasad,
Thanks to clear my doubts

Pankaj Jain

Stuart Dootson22-Feb-07 2:27

Stuart Dootson

22-Feb-07 2:27

A MultiColumn ListBox doesn't give that functionality - you want a ListView instead. To add text to a ListView in the way you want, use something like:

// Set up the columns
LVCOLUMN col = {0};
SendDlgItemMessage(IDC_LIST2, LVM_INSERTCOLUMN, 0, (LPARAM)&col);
col.iSubItem = 1;
SendDlgItemMessage(IDC_LIST2, LVM_INSERTCOLUMN, 1, (LPARAM)&col);

LVITEM item = {0};
item.mask = LVIF_TEXT;
item.iSubItem = 0;
item.pszText = "Hi";
int itemIndex = (int)SendDlgItemMessage(IDC_LIST2, LVM_INSERTITEM, 0, (LPARAM)&item);
item.iSubItem = 1;
item.pszText = "All";
SendDlgItemMessage(IDC_LIST2, LVM_SETITEMTEXT, itemIndex, (LPARAM)&item);

SendDlgItemMessage(IDC_LIST2, LVM_SETCOLUMNWIDTH, 0, LVSCW_AUTOSIZE);
SendDlgItemMessage(IDC_LIST2, LVM_SETCOLUMNWIDTH, 1, LVSCW_AUTOSIZE);

[Updated to correct code, add column sizing]

Last modified: 17mins after originally posted --

CString::AllocSysString

Q2A19-Feb-07 17:17

Q2A

19-Feb-07 17:17

Hi All,
I use AllocSysString like this
1) - CString myStr="ABCD";
int i=SomeFunction(myStr.AllocSysString());
Later in the code I free the memory as SysFreeString(_com_util::ConversStringToBSTR(myStr));
After using a memory profiling tool now, I don't get a mem. leak in this manner.
Is this the correct approach or should I use
2) - CString myStr="ABCD";
BSTR myStrBSTR=myStr.AllocSysString();
int i=SomeFunction(myStrBSTR);
and then use SysFreeString. While googling I found out the use of CComBSTR.
Can someone here tell me if I am using the right approach or should I use the second one, or use CComBSTR that manages allocation/deallocation by itself.

Re: CString::AllocSysString

prasad_som19-Feb-07 18:29

19-Feb-07 18:29

Q2A wrote:
1) - CString myStr="ABCD";
int i=SomeFunction(myStr.AllocSysString());
Later in the code I free the memory as SysFreeString(_com_util::ConversStringToBSTR(myStr));
After using a memory profiling tool now, I don't get a mem. leak in this manner.

This approach will definitely cause memory leak, instead use CComBSTR.

CString str(_T("Some Value");
CComBSTR bsStr(str.AllocSysString());
int i=SomeFunction(bsStr);

or Use CComBSTR.

CComBSTR bsStr(_T("Some Value"));
int i=SomeFunction(bsStr);

Here, you dont need to worry about memory leak, CComBSTR will take care of those.

Prasad
Notifier using ATL | Operator new[],delete[][^]

CComBSTR Question

Like2Byte19-Feb-07 5:40

Like2Byte

19-Feb-07 5:40

Hello,

What's the difference between these?

CComBSTR a[256]; //note: square brackets
CComBSTR b(256); //note: parenthesis

Re: CComBSTR Question

prasad_som19-Feb-07 6:13