C / C++ / MFC Discussion Boards

Re: Need help on SetCheck

Mark Salsbery25-Feb-07 6:52

Mark Salsbery

25-Feb-07 6:52

Good one! I've been doing it the long way with SendDlgItemMessage() Frown | :(

Mark

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."
(Rex Kramer "Airplane!")

Re: Need help on SetCheck

toxcct25-Feb-07 7:02

toxcct

25-Feb-07 7:02

why not using CWnd::SetCheck(BST_CHECKED) also ?

[VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

Re: Need help on SetCheck

Mark Salsbery25-Feb-07 7:05

Mark Salsbery

25-Feb-07 7:05

Yeah I do use that when I have a control object. I meant for the non-control ones Smile | :)

Thanks!
Mark

Re: Need help on SetCheck

Missmelty25-Feb-07 3:47

Missmelty

25-Feb-07 3:47

Thank you guys for the help! Smile | :)

Missmelty

pr quadtree [modified]

satjo724-Feb-07 15:37

satjo7

24-Feb-07 15:37

Hi. I'm trying to write a pr quadtree. My code might be ugly, so bear with me. The problem I'm having is that I'm trying to reinsert a node into the tree so that it will become part of the next subtree.
for example
()
/ / \ \
(A) () () ()
/ / \ \
() () () ()
and when I insert B which falls in the region of A, the tree becomes. A falls under the region where B is.
()
/ / \ \
() () () ()
/ / \ \
(B)()(A)()
it can even be, as the leaves only matter
()
/ / \ \
(A) () () ()
/ / \ \
(B)()(A)()
where points B and A fall in their respective region. I can't find a way to insert A back into the tree without falling into infinite recursion. I'm thinking I just need a case where it won't keep looping. any help would be appreciative, thanks. sorry about the length.

edit: my code is modified from below. its similiar but its correct now. but the problem I described is still the same. Again, any help would be appreciative.

<br />
void insert(node *&root, double x, double y, double xmax, double ymax, double xmin, double ymin, int j )<br />
{<br />
	//check if root empty<br />
	if (root == NULL)<br />
	{<br />
		root = new node ( x, y, xmax/2, ymax/2, xmin/2, ymin/2 );<br />
		return;<br />
	}<br />
	//1st nw<br />
	else if ( x < 0 && y > 0 && root->xmax == 1024 && root->xmin == -1024 && root->nwnode == NULL)<br />
	{<br />
		root->nwnode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st ne<br />
	else if ( x > 0 && y > 0 && root->xmax == 1024 && root->xmin == -1024 && root->nenode == NULL)<br />
	{<br />
		root->nenode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st sw<br />
	else if ( x < 0 && y < 0 && root->xmax == 1024 && root->xmin == -1024 && root->swnode == NULL)<br />
	{<br />
		root->swnode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st se<br />
	else if ( x > 0 && y < 0 && root->xmax == 1024 && root->xmin == -1024 && root->senode == NULL)<br />
	{<br />
		root->senode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//orig start in NE<br />
	else if ( x >= 0 && y >= 0)<br />
	{<br />
		if ( root->xmax/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in SE<br />
	else if ( x >= 0 && y <= 0 )<br />
	{<br />
		if ( root->xmax/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);		<br />
			}<br />
		}<br />
		else <br />
		{<br />
			//nw<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in NW<br />
	else if ( x <= 0 && y >= 0 )<br />
	{<br />
		if ( root->xmin/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in NW<br />
	else if ( x <= 0 && y <= 0 )<br />
	{<br />
		if ( root->xmin/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymin/2 >= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
<br />
}<br />

-- modified at 5:09 Sunday 25th February, 2007

Re: convert first spot in char array to num?

Waldermort24-Feb-07 15:05

Waldermort

24-Feb-07 15:05

the atoi() function converts a string to a int, if you want to convert a single character you must fist create a string.

char single[2] = {0,0};<br />
single[0] = string[0];

Also here:
atoi(string[0]);
you are passing a single character, but the function expects a pointer to a character.
atoi(&string[0]);

Also note, the function will read all the characters until it finds one that is not a number or it finds the null. You need to use the method above to extract the character first.

Re: convert first spot in char array to num?

kcg8224-Feb-07 15:21

kcg82

24-Feb-07 15:21

im confused where the STRING comes into play, isnt my original char string enough? this code is just a representation of what im working on. any way you can modify what i posted originally and show me what to put where, im just not following.

Re: convert first spot in char array to num?

Waldermort24-Feb-07 15:31

Waldermort

24-Feb-07 15:31

In your post you said you wanted to convert the first character of your string into a number, but the atoi function does not take a single character, it takes a string ( a row of characters ending with a null ). If you want to convert only a single character, you must first take it out of your string, then make a new string. Then you can convert it using atoi.

In your code you tried passing a single character to atoi and not a string.

Exporting Error Please help

snouto24-Feb-07 8:20

snouto

24-Feb-07 8:20

hello everybody in this forum.
i just have one problem.

i want to create a dll file in C++ that i can import using (System.Runtime.InteroServices) in C#
when i create a function with this declaration signature i successfully can call it from C# environment(managed)

<br />
extern "C" __declspec(dllexport) void DisplayMessage()<br />
{ <br />
    std::cout << "hello World from unmanaged environment";<br />
}<br />

i compiled the dll in C++ it is called mydll.dll

in C# ;

<br />
using System.Runtime.InteroServices;<br />
<br />
<br />
//in the class declaration<br />
public class MainClass<br />
{<br />
     [DLLImport("mydll.dll")] // in the same directory of the current application<br />
public static extern void DisplayMessage();<br />
<br />
static void Main()<br />
{<br />
   DisplayMessage(); // the message string written to the console window successfully.<br />
}<br />
}<br />

but when i create in that dll a class in c++ called GradeBook and i create it inside the DisplayMessage
for example.

<br />
class GradeBook<br />
{<br />
void DisplayMessage()<br />
{<br />
   std::cout <<"hello world from unmanaged resources";<br />
}<br />
};<br />
<br />
<br />
//and inside that dll export functions that will be called from C#<br />
<br />
extern "C" __declspec(dllexport) void ExternalMessage()<br />
{<br />
   GradeBook currentGrade;<br />
    currentGrade.DisplayMessage();<br />
}<br />

and in C#;

<br />
using System.RunTime.InteroServices;<br />
<br />
<br />
<br />
<br />
<br />
//dll importing attribute<br />
[DllImport("mydll.dll")]<br />
public static extern void ExternalMessage();<br />
<br />
<br />
<br />
<br />
//and in the main method<br />
static void Main(string[] args)<br />
{<br />
    ExternalMessage();<br />
}<br />

i got a nullReferenceException i don't know why guys please help me .

Human knowledge belongs to the world.

Re: Exporting Error Please help

Newbie0024-Feb-07 8:42

Newbie00

24-Feb-07 8:42

Do you think repeating the question will illuminate us all and you will get 1000 answers?? Well one reply you've already got...mine (that)

Re: Exporting Error Please help

Mark Salsbery24-Feb-07 9:04

Mark Salsbery

24-Feb-07 9:04

If you step into the ExternalMessage() call in the debugger where does the exception occur?

Getting last inserted row's autonumber in ADO?

MasterShin24-Feb-07 7:25

MasterShin

24-Feb-07 7:25

Hi,

After connecting with a _ConnectionPtr and opening a _RecordsetPtr with an Insert command, how do I get the autonumber column from the inserted row?

I understood that I could do it if I used AddNew instead of an insert command, but that's a problem of circumstance. Mainly relating to the fact I couldn't understand how to easily use this function.

(I'm actually trying to wrap ADO to work from a computer game's scripting, and all variables are strings in there, but clearly in the database some may not, so wrapping AddNew seems hard to me)

Any help would be appreciated!

Re: Getting last inserted row's autonumber in ADO?

Mark Salsbery24-Feb-07 7:28

Mark Salsbery

24-Feb-07 7:28

Try posting your question here[^] as well.

Mark

[API] Add a dll

abbd24-Feb-07 5:31

abbd

24-Feb-07 5:31

i would add a dll in my project but i don't know how i can introduce him, iam viewing a reference but i can't add him, i work with Visual Studio 2005 please help me.
Thank you very mutch.

Re: [API] Add a dll

Mark Salsbery24-Feb-07 6:40

Mark Salsbery

24-Feb-07 6:40

Do you want to add a new DLL project to a solution or use a DLL with a current project?

To use a DLL with a current project - Depends on how you are linking (at runtime) to the DLL:
explicitly or implicitly.

Explicitly - you need to add code which loads the DLL and obtains pointers to functions in the
DLL.

Implicitly - you need an import library (.lib file) created from the DLL. Add the .lib file to
yor project and link.

Re: [API] Add a dll [modified]

abbd24-Feb-07 7:06

abbd

24-Feb-07 7:06

Yes explicity, they are an exemple in C, they Use Netica.dll and Netica.lib,
but in C they are not .h and .cpp, i don't know how i add the .dll and .lib?

Re: [API] Add a dll

Mark Salsbery24-Feb-07 7:20

Mark Salsbery

24-Feb-07 7:20

You can add the lib file to your project _ project menu choose add existing item and select the
lib file.

For the dll - it only needs to be available at runtime - the project doesn't need it.

It needs to be in one of thes places (I ripped this from the docs):
"1) The directory from which the application loaded.
2) The current directory.
3) The system directory. Use the GetSystemDirectory function to get the path of this directory.
4) The 16-bit system directory. There is no function that obtains the path of this directory, but it is searched.
5) The Windows directory. Use the GetWindowsDirectory function to get the path of this directory.
6) The directories that are listed in the PATH environment variable."

Re: [API] Add a dll

abbd24-Feb-07 7:29

abbd

24-Feb-07 7:29

They are 3 way to add, in Ressource Files? or in Source Files? or in Header Files. For exemple when i add Netica.lib or Netica.dll in Header Files a message apear "Matching Custom build rule not found"
Thank you.

Re: [API] Add a dll

Mark Salsbery24-Feb-07 7:36

Mark Salsbery

24-Feb-07 7:36

I didn't think it needed a custom build rule.

Try right click on project in solution explorer and choose properties.
Navigate to the Linker/Input section and on the line that says "Additional Dependencies" you can
add the lib pathname there.

Re: [API] Add a dll

abbd24-Feb-07 7:53

abbd

24-Feb-07 7:53

ok, i have adding a Netica.dll in additional Dependencies, and for Netica.dll? where i add her?

Re: [API] Add a dll

Mark Salsbery24-Feb-07 7:57

Mark Salsbery

24-Feb-07 7:57

Add the lib, not the dll, to the project.
The project doesn't need the dll. The dll needs to be located where the system can find it at
runtime - I gave those places in a previous reply Smile | :)

Mark

Re: [API] Add a dll [modified]

abbd24-Feb-07 8:34

abbd

24-Feb-07 8:34

ok, but when i write net_bn *net;, they are error: undeclared identifier, so this exemple work in C,but C and C++ not identique, the exemple in C, They are Netica.dll, Netica.lib, Netica.h, Netica.cpp, NeticaEx.h and Demo.c, and code of Demo.c in the top they are:

#include "Netica.h"
#include "NeticaEx.h"

i must itegrate this two line in c++?

it's extra if you can help me, a code was in http://www.norsys.com/downloads/NeticaAPI_Win.zip[^]

-- modified at 14:48 Saturday 24th February, 2007

Re: [API] Add a dll

Mark Salsbery24-Feb-07 8:42

Mark Salsbery

24-Feb-07 8:42

Yes you'll need those #include lines in any source module that uses functions/classes in the
DLL. Otherwise it won't compile.

Re: [API] Add a dll

abbd24-Feb-07 8:57

abbd

24-Feb-07 8:57

ok, i try it and i tell a result,.
MessageBox("my message") dont work in Visual Studio 2005 so It work in C++ 6.0, can you help me to show message?
thank you.

Re: [API] Add a dll

Mark Salsbery24-Feb-07 9:05

Mark Salsbery

24-Feb-07 9:05

abbd wrote:
MessageBox("my message") dont work in Visual Studio 2005

What do you mean by "dont work"??

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