C / C++ / MFC Discussion Boards

Re: Compiling a single dll from several .lib

Themis27-Mar-07 6:38

27-Mar-07 6:38

Yes I want to create a super-DLL that others (apps or dll) can link and refer to its included objects.

However I don't want to merge the several .lib projects into one .dll project to generate my dynamic library as my .libs do not match conceptually, hence I prefer to have them separate in the Solution Explorer. Think of a large base dll with several support projects, like networking, serialization, utilities etc. all merged in a single project_base.dll.

Cheers,
Themis

Re: Compiling a single dll from several .lib

C^hris L^osinger27-Mar-07 6:50

C^hris L^osinger

27-Mar-07 6:50

add your .LIBs to the Additional Dependencies field in the Linker/Input propoerty page.

then you will need to explicitly export all of the functions and variables from the various .LIBs, from the DLL.

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Re: Compiling a single dll from several .lib

Themis27-Mar-07 7:10

Themis

27-Mar-07 7:10

I have already added the dependencies in the dll properties. However I am not sure what you mean when you say "you will need to explicitly export all of the functions and variables from the various .LIBs, from the DLL".

I export symbols (classes/functions) using dllexport in each project. Do you mean that I have to do anything more in the dll project? The fact is that without referencing a class from the dll project it will not be linked by the linker to the target dll. I am wondering if I can bypass this linker "optimization" and make the linker unconditionally add a class' code in the dll.

Cheers, Themis

How to detect change in desktop

MachineMHK27-Mar-07 4:28

MachineMHK

27-Mar-07 4:28

Hi, i want detect any change in desktop area. Like, a new apllication run, desktop wallpaper change, etc

[go to end]

Re: How to detect change in desktop

Programm3r27-Mar-07 5:02

Programm3r

27-Mar-07 5:02

What about looking in your registries ??
I wonder .... Confused | :confused:

Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Re: How to detect change in desktop

David Crow27-Mar-07 5:54

David Crow

27-Mar-07 5:54

MachineMHK wrote:
Hi, i want detect any change in desktop area. Like...desktop wallpaper change, etc

Assuming that SystemParametersInfo() was used to make the change, handle the WM_WININICHANGE message.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

how to get difference between two dates using CDateTimeCtrl ?

jalsa G27-Mar-07 4:13

jalsa G

27-Mar-07 4:13

hi all,

how to get difference between two dates using CDateTimeCtrl ?

venu

Re: how to get difference between two dates using CDateTimeCtrl ?

Iain Clarke, Warrior Programmer27-Mar-07 4:48

Iain Clarke, Warrior Programmer

27-Mar-07 4:48

Simple - extract the date / time from the control CDateTimeCtrl::GetTime (...). You would then have a CTime, SYSTEMTIME, or even a COleDataTime.

CTime has comparison functions you can use.

Iain.

Re: how to get difference between two dates using CDateTimeCtrl ?

David Crow27-Mar-07 5:56

David Crow

27-Mar-07 5:56

Put the two times in a COleDateTime object, and get the difference via COleDateTimeSpan.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Sorting a vector of non-primitive data types (structs)

all_in_flames27-Mar-07 3:08

all_in_flames

27-Mar-07 3:08

Hi everyone,
I'm attempting to write a program that takes command line arguments, reads data in from a file,
and then appropriately searches for certain data or sorts the data for output based on the argument passed.

I am having trouble figuring out how to actually sort the vectors according to the attributes.
the struct is as follows:

<br />
struct Wizard<br />
{<br />
string FirstName;<br />
string LastName;<br />
int Grade;<br />
double WandWeight;<br />
};<br />

The datafile being read from simply has each property separated by a single whitespace character. The vector is declared simply as:

<br />
vector(Wizard) wizVec;<br />

(NOTE: angle braces would not show up in preview, assume they take the place of the round braces in the vector declaration)

Don't ask about the name of the struct, it's my prof's example!
Any suggestions or solutions are appreciated and needed!
Thanks in advance!

Re: Sorting a vector of non-primitive data types (structs)

Christian Graus27-Mar-07 3:12

Christian Graus

27-Mar-07 3:12

To get < and > to show, you need to check 'Ignore HTML tags' below.

You can write a function object that compares two Wizard objects, and pass that into the sort algorithm.

Here[^] is an article on the subject.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Sorting a vector of non-primitive data types (structs)

Stephen Hewitt27-Mar-07 4:05

Stephen Hewitt

27-Mar-07 4:05

Use std::sort to sort the vector. Add an operator < for your struct to define the sort order or code a predicate function or functor and pass it to std::sort.

Steve

Re: Sorting a vector of non-primitive data types (structs)

all_in_flames27-Mar-07 5:16

all_in_flames

27-Mar-07 5:16

Thanks for the article Christian, and the suggestion, Stephen. I will try to follow the instructions in the article. I appreciate the help, and the speedy replies Smile | :)

Does this logic make sense in context?

void SortVecAscending(vector<Wizard> &wizVector, string prop)
{
// Sort vector smallest to largest, according to prop(erty)
bool compare_Wizards(const Wizard& a, const Wizard& b)
{
return a.prop < b.prop;
}

std::sort(wizVector.begin(), wizVector.end(), compare_Wizards);
}

Re: Sorting a vector of non-primitive data types (structs)

Christian Graus27-Mar-07 6:02

Christian Graus

27-Mar-07 6:02

Yes, that looks like it should work.

Re: Sorting a vector of non-primitive data types (structs)

Stephen Hewitt27-Mar-07 13:33

Stephen Hewitt

27-Mar-07 13:33

C++ does not support local functions (functions in functions). You can have functors in function however.

Steve

Re: Sorting a vector of non-primitive data types (structs)

Stephen Hewitt27-Mar-07 13:33

Stephen Hewitt

27-Mar-07 13:33

C++ does not support local functions (functions in functions). You can have functors in function however.

Steve

Re: Sorting a vector of non-primitive data types (structs)

all_in_flames27-Mar-07 12:12

all_in_flames

27-Mar-07 12:12

Thanks again for all your help, gentlemen. I got the sorting working with no more problems.
However, now that I have moved on to the searching portion, I find that the way the project is designed,
I have to search for values in the structs that are NOT strings.

To refresh your memory:
struct Wizard
{
string FirstName;
string LastName;
int Grade;
double WandWeight;
};

Is there any viable way to convert a string to an int, a string to a double, or vice versa?
I have attempted to use static_cast<string>() on the int and double values, and static_cast<int>() / static_cast<double>() on the string values, but the compiler didn't like those conversions.

I have looked around, and there is nothing available to me without downloading someone's class and using it. Since this is a school project, I have a feeling that would be frowned upon.

Any ideas?

If any clarification is needed, simply ask.

Re: Sorting a vector of non-primitive data types (structs)

Stephen Hewitt27-Mar-07 13:47

Stephen Hewitt

27-Mar-07 13:47

There are multiple ways, here's one:

// CommandLine.cpp : Defines the entry point for the console application.
//
 
#include "StdAfx.h"
#include <iostream>
#include <string>
#include <sstream> // For 'istringstream'.
 
int main()
{
	using namespace std;
 
	string s = "1234";
	int num;
	istringstream ss(s);
	ss >> num;
	if (ss)
	{
		cout << "Number is " << num << endl;
	}
 
	return 0;
}

And another:

// CommandLine.cpp : Defines the entry point for the console application.
//
 
#include "StdAfx.h"
#include <iostream>
#include <string>
#include <cstdlib>
 
int main()
{
	using namespace std;
 
	string s = "1234";
	int num = atoi(s.c_str());
	cout << "Number is " << num << endl;
 
	return 0;
}

The second method is easier but error handling is more difficult as if no valid conversion could be performed, a zero value is returned. Also, in the first version simply changing the type of the num variable will make the code work different types but the second version requires a distinct function for each type: atoi only works for ints.

Steve

Re: Sorting a vector of non-primitive data types (structs)

all_in_flames27-Mar-07 13:54

all_in_flames

27-Mar-07 13:54

Thanks again!
I ended up using the stringstream approach, as our prof is fanatical about us not using "pure" C functions.

You guys are life savers!

Regards,

Bryan

Re: Sorting a vector of non-primitive data types (structs)

Stephen Hewitt27-Mar-07 13:57

Stephen Hewitt

27-Mar-07 13:57

Your professor is a wise man.

Steve

Re: Sorting a vector of non-primitive data types (structs)

Michael Dunn27-Mar-07 20:36

Michael Dunn

27-Mar-07 20:36

all_in_flames wrote:
Is there any viable way to convert a string to an int, a string to a double, or vice versa?

For future reference, we have a FAQ here Smile | :)

--
6.3 How can I change a number into its string representation, or vice versa? [^]

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

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Re: Sorting a vector of non-primitive data types (structs)

all_in_flames28-Mar-07 2:16

all_in_flames

28-Mar-07 2:16

Thanks for the info, Mike!
I'm a codeproject n00b, but I get the newsletter! Wink | ;)

lparam and wparam

Try27-Mar-07 2:59

Try

27-Mar-07 2:59

What are these 'lparam' and 'wparam' ? Where can i get info abt these?

Consider:
BOOL PostMessage(
UINT message,
WPARAM wParam = 0,
LPARAM lParam = 0
);

MSDN says
The content of 'lparam' and 'wparam' parameter depends on the message being posted.
What will be the values when mouse is clicked or key is pressed?

Thanks in Advance.

Re: lparam and wparam

David Crow27-Mar-07 3:03

David Crow

27-Mar-07 3:03

LameThought wrote:
What are these 'lparam' and 'wparam' ?

They are message-specific values. Some messages use one, the other, both, or neither.

LameThought wrote:
Where can i get info abt these?

MSDN, CP, Google.

LameThought wrote:
What will be the values when mouse is clicked or key is pressed?

Again, it all depends on the specific message you are inquiring about.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: lparam and wparam

Try27-Mar-07 3:12

Try

27-Mar-07 3:12

Now, i want to Set Focus for Edit Box in Dialog using PostMessage, then what will be the values of both?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.