Re: How to receive a dead character message? - C / C++ / MFC Discussion Boards

bob1697225-Feb-07 9:00

25-Feb-07 9:00

/* On Visual C++ 6.0, this works (Disclaimer: but be careful with char/int conversions in the general sense)
*/

char ch = -42;
char szBuffer[33]={0}; // 32-bit

itoa(ch,szBuffer,2);
TRACE("Binary of %d : %s\n",ch,szBuffer+24); // 8-bit

when i mouse down a button, why the button change style default button?

mfc_dialog25-Feb-07 1:16

mfc_dialog

25-Feb-07 1:16

spy++ track message

P WM_LBUTTONDOWN fwKeys:MK_LBUTTON xPos:39 yPos:11
S WM_GETDLGCODE
R WM_GETDLGCODE fuDlgCode:DLGC_UNDEFPUSHBUTTON | DLGC_BUTTON
S WM_GETDLGCODE
R WM_GETDLGCODE fuDlgCode:DLGC_UNDEFPUSHBUTTON | DLGC_BUTTON
S BM_SETSTYLE dwStyle:BS_DEFPUSHBUTTON fRedraw:True

p WM_LBUTTONUP fwKeys:00000 xPos:20 yPos:84
S WM_CAPTURECHANGED hwndNewCapture:00000000
R WM_CAPTURECHANGED
P WM_MOUSELEAVE
P WM_PAINT hdc:00000000
S WM_GETDLGCODE
R WM_GETDLGCODE fuDlgCode:DLGC_DEFPUSHBUTTON | DLGC_BUTTON
S BM_SETSTYLE dwStyle:BS_PUSHBUTTON fRedraw:True

thanks.

Re: when i mouse down a button, why the button change style default button?

Michael Dunn25-Feb-07 6:40

Michael Dunn

25-Feb-07 6:40

That's how the button control works, the button that has the focus also becomes the default button, so you can click it by hitting Enter.

--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?

What control can I use to display one page of document or HTML document?

zhaque25-Feb-07 1:11

zhaque

25-Feb-07 1:11

Hi experts,
I build one page of document which is a result of some calculation.
What control can I use to display one of document or HTML document?
How can I print it?
I want to use dialog box.

Thanks,

How to receive a dead character message?

udiraz24-Feb-07 22:01

udiraz

24-Feb-07 22:01

Hi,

I am trying to catch a message when a dead character is pressed:

I created a single document project and tried the following:

1. Add ON_WM_DEADCHAR() and a corresponding OnDeadChar() method
2. Implemented WindowProc() and search for WM_DEADCHAR message.

To make sure that keyboard message are catched, I catch WM_KEYDOWN as well and it is works fine.

Does someone have a clue how to get a message when a dead key is pressed?

Thanks, Udi Raz

Re: How to receive a dead character message?

toxcct25-Feb-07 0:05

toxcct

25-Feb-07 0:05

udiraz wrote:
a dead character

udiraz wrote:
a dead key

what on earth is that ??

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

Re: How to receive a dead character message?

Newbie0025-Feb-07 0:11

Newbie00

25-Feb-07 0:11

Maybe it's not on earth but on the Mars ?? Unsure | :~

Re: How to receive a dead character message?

S Douglas25-Feb-07 1:47

S Douglas

25-Feb-07 1:47

toxcct wrote:
what on earth is that

CWnd::OnDeadChar[^]

MSDN:
The framework calls this member function when the OnKeyUp member function and the OnKeyDown member functions are called

Looks like its called when there are contradictory calls in the queue. Unsure | :~

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Re: How to receive a dead character message?

toxcct25-Feb-07 6:29

toxcct

25-Feb-07 6:29

oh, I never heard of this one... thanks for the link !

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

Re: How to receive a dead character message?

S Douglas25-Feb-07 20:13

S Douglas

25-Feb-07 20:13

toxcct wrote:
I never heard of this one

Yea, ditto, I had to look it up. Not to sure why the OP is worried about it, but whatever, learn something new every day. Smile | :)

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Re: How to receive a dead character message?

S Douglas25-Feb-07 1:51

S Douglas

25-Feb-07 1:51

udiraz wrote:
Does someone have a clue how to get a message when a dead key is pressed?

I wouldn't worry about it to much.

CWnd::OnDeadChar[^]

MSDN:
The framework calls this member function when the OnKeyUp member function and the OnKeyDown member functions are called

Looks like its called when there are contradictory calls in the queue. Unsure | :~

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

What's the best way to write a certain number of empty bytes to a file?

Sean Wcisel24-Feb-07 21:23

Sean Wcisel

24-Feb-07 21:23

Hello everyone,
I'm trying to write some code that reads two bytes from a location in a file, and checks to see if those bytes are empty before writing something to that space. My problem is that the bytes being read seem to contain a lot of junk from somewhere else. I'd like to write nothingness to bytes (itemsize * itemnumber) + (itemsize * itemnumber) ... etc. This seems like a relatively easy fix, anyone have any ideas?

Thanks,
Sean

P.S. this is an fstream we're talking about here

what is "Insufficient System Reource"?

Jefferson Liu24-Feb-07 18:54

Jefferson Liu

24-Feb-07 18:54

I write a program to split a big file(several GBs) to very small files.
It takes hours for one run. I got "Insufficient System Reource" or "abnormal program termination" error when the program is close to end(when the splitting is close to finish), on Windows XP. all running programs on my system seem in unstable state, i cannot send mail("out of memory"), or access local network resouce, but the task manager doesn't show any number that is anormaly high. the only thing i can do is to reboot.

Need help on SetCheck

Missmelty24-Feb-07 18:46

Missmelty

24-Feb-07 18:46

Good day ppl,

I need to set a checkbox(IDC_CHECK_1A) to be checked when the form is first loaded.

At OnInitDialog(); ,
how to go about in implementing this with a member variable and SetCheck();?

Need help urgently. Thanks!

Missmelty

Re: Need help on SetCheck

Mark Salsbery24-Feb-07 19:24

Mark Salsbery

24-Feb-07 19:24

Without a control member variable you could do it like this:

SendDlgItemMessage(IDC_CHECK_1A, BM_SETCHECK, BST_CHECKED);

To add a control you can right click on the control in the resource editor and coose Add Variable.
Add a control variable, type CButton, and give it a name. The variable will be added to the class
associated with the dialog resource.

Once you have a control (e.g. CButton m_Checkbox1A):

m_Checkbox1A.SetCheck(BST_CHECKED);

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

Ravi Bhavnani24-Feb-07 20:08

Ravi Bhavnani

24-Feb-07 20:08

CheckDlgButton (IDC_CHECK_1A, BST_CHECKED);

/ravi

This is your brain on Celcius
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

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

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.

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