adding variables to a struct that were read in from a file - C / C++ / MFC Discussion Boards

Ryan Binns27-Jun-03 5:17

27-Jun-03 5:17

ScreenToClient()

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

how to acquire system icon(like my computer) through programming?

Anonymous27-Jun-03 4:31

Anonymous

27-Jun-03 4:31

I have to get system icon like "my computer" in my program, what can I do?hope to get help from you, TIA

Re: how to acquire system icon(like my computer) through programming?

Ryan Binns27-Jun-03 4:43

Ryan Binns

27-Jun-03 4:43

LPITEMIDLIST pidl;
if(FAILED(SHGetSpecialFolderLocation(NULL, CSIDL_DRIVES, &pidl)))
{
   // Handle failure
}
SHFILEINFO shfi;
if(SHGetFileInfo((LPCTSTR)pidl, 0, &shfi, sizeof(shfi), SHGFI_PIDL | SHGFI_LARGEICON) == 0)
{
   // Handle failure
}
LPMALLOC lpMalloc;
if(FAILED(SHGetMalloc(&lpMalloc))
{
   // Handle failure
}
lpMalloc->Free(pidl);
// shfi.hIcon should be the icon of My Computer

To get the small icon, use SHGFI_SMALLICON instead of SHGFI_LARGEICON.

Hope this helps,

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: how to acquire system icon(like my computer) through programming?

tiplip27-Jun-03 17:29

tiplip

27-Jun-03 17:29

With Windows 2000, this function SHGetSpecialFolderLocation is superseded by ShGetFolderLocation. but when I use ShGetFolderLocation, system tells me error as follows:
error C2065: 'SHGetFolderLocation' : undeclared identifier
Error executing cl.exe
would you like to tell me how to deal with this problem? TIA

Re: how to acquire system icon(like my computer) through programming?

Ryan Binns27-Jun-03 17:37

Ryan Binns

27-Jun-03 17:37

#define _WIN32_IE 0x0500 before including shlobj.h

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: how to acquire system icon(like my computer) through programming?

tiplip27-Jun-03 19:35

tiplip

27-Jun-03 19:35

Dear sir:do you have similar example? why cant I make it although I do as you told me a moment ago? my email:tiplip@msn.com, thanks a lot!

Re: how to acquire system icon(like my computer) through programming?

Ryan Binns28-Jun-03 0:12

Ryan Binns

28-Jun-03 0:12

This is a program that compiles perfectly on my system (VC6, Oct02 SDK, WinXP):

#include "stdafx.h"
#define _WIN32_IE	0x0500
#include <shlobj.h>

int __stdcall WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nCmdShow)
{
   LPITEMIDLIST pidl;
   SHGetFolderLocation(NULL, CSIDL_DRIVES, NULL, NULL, &pidl);
   return 0;
}

It doesn't do actually anything useful so you'll need to fill in the rest from the last example I gave you.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

adding variables to a struct that were read in from a file

johnstonsk27-Jun-03 4:05

johnstonsk

27-Jun-03 4:05

I have been using the getline() to read in lines from a file and delimiting on commas.
I need to set the items in a struct to these values that I read in.

When I get the data from the struct, I get garbage out.

Am I doing this wrong?

Some of the variables that are read in from the file are doubles and I have been using the atof() function to convert from string to double. But, the only way that the struct will allow me to put them in is if I use the c_str() function.

Thanks,
sj

<br />
<br />
<br />
struct TSimSignal<br />
	{<br />
		double Min[5];	  <br />
		double Max[5];	  <br />
		double Value[5]; <br />
		string Name[5];<br />
		string Unit[5];<br />
	};<br />
<br />
<br />

<br />
void setInitialValues(TSimSignal &s){<br />
<br />
		string name,unit,min,max,value;<br />
<br />
		fin.open("mockData.dat");	<br />
	<br />
		for(int i=0; i<sizeof(s.Name); i++){<br />
			getline(fin, name, ',');<br />
			if(name == "STOP")<br />
				break;<br />
			getline(fin, unit, ',');<br />
			getline(fin, min, ',');<br />
			getline(fin, max, ',');<br />
			getline(fin, value);<br />
			<br />
			<br />
			//s.Name[i] = name;<br />
			//s.Unit[i] = unit;<br />
			//s.Min[i]  = atof(min.c_str());<br />
		        //s.Max[i]  = atof(max.c_str());<br />
		        //s.Value[i]= atof(value.c_str());<br />
		}<br />
		<br />
	//dumpData(s);<br />
<br />
}<br />
<br />

Re: adding variables to a struct that were read in from a file

Ryan Binns27-Jun-03 4:27

Ryan Binns

27-Jun-03 4:27

Just a hint. When you're posting code, replace the '<' and '>' with '<' and '>' respectively, otherwise things like your for loop won't turn out properly.

Your code looks correct. Is the data getting loaded correctly? Can you see the values in the strings with debugger before you store it to the struct? Is fin declared as an ifstream? You might want to post the code with the '<' and '>' changed - it would make it a lot easier to see what it's doing Smile | :)

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: adding variables to a struct that were read in from a file

johnstonsk27-Jun-03 5:15

johnstonsk

27-Jun-03 5:15

Sorry about that, slipped my mind.

After watching the debugger, I realized the problem lies when I read the data back out of the struct.
I was using the sizeof(s.Name) thinking that it would return 5, but it was returning 80.

OK..... The getline returns a string. I really need my struct to have chars instead of strings.

But as you know; you can't convert a sting to a char.

Is there any way to do this?

I've only been coding for a few months now.

Thanks for the patients,
sj Smile | :)

-----------Right now it is......----------

struct TSimSignal<br />
	{<br />
		double Min[5];	  <br />
		double Max[5];	  <br />
		double Value[5]; <br />
		string Name[5];<br />
		string Unit[5];<br />
	};

-----I really need it to be.....----------

struct TSimSignal<br />
	{<br />
		double Min[5];	  <br />
		double Max[5];	  <br />
		double Value[5]; <br />
		char Name[5];<br />
		char Unit[5];<br />
	};<br />

Re: adding variables to a struct that were read in from a file

Ryan Binns27-Jun-03 5:20

Ryan Binns

27-Jun-03 5:20

johnstonsk wrote:
char Name[5];
char Unit[5];

Actually, it should be:

char *Name[5];
char *Unit[5];

since C strings are a pointer to an array of characters. Then do this:

s.Name[i] = strdup(name.c_str());
s.Unit[i] = strdup(unit.c_str());

Hope this helps,

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: adding variables to a struct that were read in from a file

johnstonsk27-Jun-03 5:24

johnstonsk

27-Jun-03 5:24

Thanks

sj

Re: adding variables to a struct that were read in from a file

Rage27-Jun-03 4:47

Rage

27-Jun-03 4:47

@Ryan : After using the "show me all" routine Big Grin | :-D

for(int i=0; i<sizeof(s.Name); i++){
getline(fin, name, ',');
if(name == "STOP")
break;
getline(fin, unit, ',');
getline(fin, min, ',');
getline(fin, max, ',');
getline(fin, value);

~RaGE();

Re: adding variables to a struct that were read in from a file

Ryan Binns27-Jun-03 4:59

Ryan Binns

27-Jun-03 4:59

Perhaps Chris should add a script that automatically converts '<' and '>' in <pre> tags to HTML character codes Smile | :)

.

and possibly '&' as well Smile | :)

Re: adding variables to a struct that were read in from a file

John M. Drescher27-Jun-03 5:53

John M. Drescher

27-Jun-03 5:53

I wish he did that. I know you can say no html that looks ok but if you want to use the <pre> tags it is a pain to edit your code samples..

John

Re: adding variables to a struct that were read in from a file

David Crow27-Jun-03 4:54

David Crow

27-Jun-03 4:54

What is the format of mockData.dat?

Re: adding variables to a struct that were read in from a file

johnstonsk27-Jun-03 5:18

johnstonsk

27-Jun-03 5:18

pla,deg,0.0,130.0,0.0
pitch_stickF,lbs,-3.28,4.4,0.0
roll_stickF,lbs,-13.0,13.0,0.0
yaw_pedal,lbs,-3.87,3.87,0.0
spbrk_pos,retract.hold.extend,-1.0,1.0,0.0
STOP,1

This is just a test file. The actual file has around 500 lines.

sj Smile | :)

Re: adding variables to a struct that were read in from a file

David Crow27-Jun-03 5:42

David Crow

27-Jun-03 5:42

This is not the recommended way to do what you are doing, but I just wanted to show you an alternative.

struct TSimSignal
{
    double Min;
    double Max;
    double Value; 
    char Name[32]; // CString or std::string would no doubt be better here
    char Unit[32];
} t[500]; // shouldn't be hard-coded

FILE *pFile;
for (int x = 0; ...)
{
    // should use parser (e.g., FSM) since sscanf is not fail-safe
    sscanf(pFile, "%[^,],%[^,],%f,%f,%f", t[x].Name, t[x].Unit, &(t[x].Min), &(t[x].Max), &(t[x].Value));
}

Re: adding variables to a struct that were read in from a file

Ryan Binns27-Jun-03 4:56

Ryan Binns

27-Jun-03 4:56

Instead of putting "i<sizeof(s.Name)" in your for loop, use "i<sizeof(s.Name)/sizeof(string)". sizeof() gives you the size of the variable/type in bytes, not the number of elements in the array. The size of a string is at least 4 bytes, so your loop will go at least 20 times - 5*sizeof(string). Your memory will therefore be overwritten by any writes after the 5th loop, and you'll end up with rubbish.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: adding variables to a struct that were read in from a file

johnstonsk27-Jun-03 5:24

johnstonsk

27-Jun-03 5:24

Thanks Ryan it works great.

Is there anyway that I can read the file and the items read in are chars instead of strings?

You da' man, Smile | :)

Re: adding variables to a struct that were read in from a file

Ryan Binns27-Jun-03 13:48

Ryan Binns

27-Jun-03 13:48

johnstonsk wrote:
Is there anyway that I can read the file and the items read in are chars instead of strings?

There is, but I don't really think there's a lot of merit in doing so. Using the string functions is safe - it prevents buffer overflows by allocating just the right amount of memory. Trying to allocate memory yourself is just a PITA and can cause all sorts of security errors. I would stick with what you're doing. If it works safely, there's not much point changing it.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

About SetIcon

olinn27-Jun-03 3:56

olinn

27-Jun-03 3:56

I want to paste a icon from resource to a button by using SetIcon(), but neither m_bttnOpen.SetIcon(AfxGetApp()->LoadIcon(IDI_ICON_OPEN));
nor
m_bttnOpen.SetIcon(::LoadIcon(AfxGetApp()->m_hInstance, MAKEINTRESOURCE(IDI_ICON_OPEN)));
can do this.
Why?
And how to do this by the most simple way?
thankx

Re: About SetIcon

Rage27-Jun-03 4:25

Rage

27-Jun-03 4:25

olinn wrote:
Why?

Has your button the icon style checked ? (Go in the ressource editor, right click on your button, tab "styles", check "Icon").

olinn wrote:
And how to do this by the most simple way?

This one :

m_bttnOpen.SetIcon(::LoadIcon(AfxGetApp()->m_hInstance, MAKEINTRESOURCE(IDI_ICON_OPEN)));

~RaGE();

up and down arrows in a string.

mcgahanfl27-Jun-03 3:29

mcgahanfl

27-Jun-03 3:29

I know that ASCII numbers 27 and 28 represent up and down arrows. Is there a way to get these symbols into a CSTring?

thanks

Re: up and down arrows in a string.

basementman27-Jun-03 3:43

basementman

27-Jun-03 3:43

CString cUpDown = "\x1B Up and down arrows \x1C";

onwards and upwards...

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