C / C++ / MFC

2-Sep-04 19:47

I have a list<basic_string> which only contains 2 items.

I have found tons of examples of iterating the list, but none for only dealing with 2 items.

How do I get the string values from the first and second element?

Thanks Smile | :)

How do I print my voice mail?

Johann Gerell2-Sep-04 20:37

2-Sep-04 20:37

Hockey wrote:
I have found tons of examples of iterating the list, but none for only dealing with 2 items.

Well, you could of course iterate the list also with 2 items in it... Poke tongue | ;-P

Hockey wrote:
How do I get the string values from the first and second element?

std::list<std::wstring> strings;
strings.push_back(L"string 1");
strings.push_back(L"string 2");
cout << strings.at(0) << L" and " << strings.at(1);

Might output string 1 and string2, if you are lucky.

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alex.barylski2-Sep-04 20:50

2-Sep-04 20:50

Cool i'll try it Smile | :)

Thanks

How do I print my voice mail?

alex.barylski2-Sep-04 20:53

2-Sep-04 20:53

Didn't work for what i'm trying to do Frown | :(

typedef std::list<std::basic_string<TCHAR> > string_list;

string_list m_lsFiles; // List of selected file(s)

Later on somewheres deep within my code I call:

MessageBox(0, m_lsFiles.at(0), m_lsFiles.at(1), MB_OK);

How do I print my voice mail?

PJ Arends2-Sep-04 21:02

PJ Arends

2-Sep-04 21:02

try:

MessageBox(0, m_lsFiles.front(), m_lsFiles.back(), MB_OK);

A list is not a random access container, so you can not retrive elements with an index number.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Johann Gerell2-Sep-04 21:13

2-Sep-04 21:13

Hah! What did I think of! I've been using to std::vector too much lately. D'Oh! | :doh:

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The Blog: Bits and Pieces

alex.barylski2-Sep-04 21:14

2-Sep-04 21:14

I think I did try that...but i'll try again to be sure Smile | :)

PJ Arends wrote:
A list is not a random access container, so you can not retrive elements with an index number.

I'm a total newbie to STL, but I just realized that Smile | :)

Thanks again

How do I print my voice mail?

alex.barylski2-Sep-04 21:19

2-Sep-04 21:19

Tried it and I get this error???

'MessageBoxA' : cannot convert parameter 2 from 'class std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >' to 'const char *'

How do I print my voice mail?

PJ Arends2-Sep-04 21:30

PJ Arends

2-Sep-04 21:30

Combine what I said about using front() and back() with what Johan said below about using c_str() to get a char* from a string.

MessageBox(0, m_lsFiles.front().c_str(), m_lsFiles.back().c_str(), MB_OK);

Do not give up on STL. It is quite cool once you get use to it.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

alex.barylski2-Sep-04 21:43

2-Sep-04 21:43

BINGO!!! It worked Smile | :)

Thank you kindly sir Smile | :)

PJ Arends wrote:
Do not give up on STL. It is quite cool once you get use to it.

it seems really cool, just frustrating when working on a due project....when I just want to get done what needs to be done Smile | :)

Thanks again!!!

How do I print my voice mail?

Johann Gerell2-Sep-04 21:05

2-Sep-04 21:05

Hockey wrote:
Didn't work for what i'm trying to do

Well, then, you should have stated what you were trying to do... Wink | ;)

To get a pointer to a character buffer containing the text of the string object you use std::wstring::c_str(), as in

MessageBox(0, m_lsFiles.at(0).c_str(), m_lsFiles.at(1).c_str(), MB_OK);

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The Blog: Bits and Pieces

alex.barylski2-Sep-04 21:17

2-Sep-04 21:17

I'm getting this error now Blush | :O

error C2039: 'at' : is not a member of 'list<class std::basic_string<char,struct="" std::char_traits<char="">,class std::allocator<char> >,class std::allocator<class std::basic_st<="" i="">

WTF am I doing wrong??

I'm really starting to dislike STL

Thanks for the help

How do I print my voice mail?

Johann Gerell2-Sep-04 23:03

2-Sep-04 23:03

As PJ pointed out, std::list is not a random access container, which means it does not provide indexed access to items. I've been working too much with std::vector...

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The Blog: Bits and Pieces

PJ Arends2-Sep-04 20:42

PJ Arends

2-Sep-04 20:42

I am slightly confused by your question. When iterating the list, what difference does it make how many items are in it, be it 0, 2, or 100?

Show some code of what you have so far.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

alex.barylski2-Sep-04 20:49

Setting "Service" dependency programatically

2-Sep-04 20:49

It just didn't make sense to use a for loop or while, whatever to only get at the first and last item in the list....there will always only be two under this one condition...

How do I print my voice mail?

Qasim Jalil2-Sep-04 19:36

Qasim Jalil

2-Sep-04 19:36

Friends,
I've developed a "Service" in Visual C++. Is start automatically during system boot up. Everything is fine.

But i want to set the dependency of this service. .i.e i want my service to start after another service "MSSQLSERVER" is started.

Can anyone tell me how can i do so. I think there is a function in service API to so so. But i dont know what function is it and how to use it ?

Re: Setting "Service" dependency programatically

parths2-Sep-04 21:09

parths

2-Sep-04 21:09

CreateService has a parameter for Dependencies:

SC_HANDLE CreateService(
SC_HANDLE hSCManager,
LPCTSTR lpServiceName,
LPCTSTR lpDisplayName,
DWORD dwDesiredAccess,
DWORD dwServiceType,
DWORD dwStartType,
DWORD dwErrorControl,
LPCTSTR lpBinaryPathName,
LPCTSTR lpLoadOrderGroup,
LPDWORD lpdwTagId,
LPCTSTR lpDependencies,
LPCTSTR lpServiceStartName,
LPCTSTR lpPassword
);

From MSDN[^]

lpDependencies:
[in] Pointer to a double null-terminated array of null-separated names of services or load ordering groups that the system must start before this service. Specify NULL or an empty string if the service has no dependencies. Dependency on a group means that this service can run if at least one member of the group is running after an attempt to start all members of the group.
You must prefix group names with SC_GROUP_IDENTIFIER so that they can be distinguished from a service name, because services and service groups share the same name space.

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-Anon.

Change Exe contents while running

Arsalan Malik2-Sep-04 18:23

Arsalan Malik

2-Sep-04 18:23

I want to change exe file contents, while running it, i.e. the exe file should be able to change itself. Actually I want to append some data to exe, which I want to change dynamically, and save within same exe. I don't want to create a temporary file, or use system registary,or any other files. Somebody, please help!

Arsalan Malik

Re: Change Exe contents while running

bmw50022-Sep-04 18:35

bmw5002

2-Sep-04 18:35

I don't think its possible to do that while its running. The solution I can think of might take a little work. Basically u write another app and insert the binary data for that app into a resource in your main app. Then you have a function that extracts the resource data using api calls and saves that file in a temporary folder, wherever. It then looks at the end of that file, and inserts the data that you want to change in your main app. Then it executes that program and closes itself. The extracted program then waits a second or two for the main program to end and then looks at itself and writes that data to the closed main program. Then it executes the main program again and closes itself. You can look it up, but I don't recall that you can write resources to the app you are executing the call from at runtime. And you definitely can't obtain write privilages to yourself while your running. Don't take my word for it though.

Re: Change Exe contents while running

alex.barylski2-Sep-04 18:37