Sent data from Doc to dialog - C / C++ / MFC Discussion Boards

Re: how to create a temporary DC using ATL without a Parent Window?

Bob Stanneveld16-Jun-05 3:17

16-Jun-05 3:17

ThinkingPrometheus wrote:
1. how do i know if the window has a DC?

All windows have a DC, as long as they are visible. I don't know if they have a DC when they are invisible.

ThinkingPrometheus wrote:
2. how do i check if hbmp is already selected? (hmm, i don't think it is, but how do i check, just to be sure?)

From where do you get the handle? I think the problem lies there, since all the other windows and dc's should be valid.
You can validate this by loading your own bitmap from disk and see what that gives you.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

convert Variant to CString?

ThinkingPrometheus15-Jun-05 23:08

ThinkingPrometheus

15-Jun-05 23:08

hiho@ll

i have to convert a string from Variant to CString (or LPCTSTR)

i read some articles about bstr conversion, but doesn't seem to work

1. i have a variant variable
2. i want to use MessageBox to show the Variant-String

how do i do this?
some code would be perfect

thx

Re: convert Variant to CString?

Graham Bradshaw15-Jun-05 23:18

Graham Bradshaw

15-Jun-05 23:18

I'll help with the conversion (I'm sure you can handle the MessageBox!)

CString GetString(const VARIANT* pvaData)
{
	if (pvaData->vt == VT_BSTR)
		return pvaData->bstrVal;

	if (pvaData->vt == (VT_BSTR | VT_BYREF))
		return *pvaData->pbstrVal;

	if (pvaData->vt == (VT_VARIANT | VT_BYREF))
		return GetString(pvaData->pvarVal);


	VARIANT varDest;
	VariantInit(&varDest);


	if (SUCCEEDED(VariantChangeTypeEx(&varDest, (VARIANT*) pvaData, LOCALE_SYSTEM_DEFAULT, 0, VT_BSTR)))
		return GetString(&varDest);

	return _T("");
}

Re: convert Variant to CString?

Nilesh K.15-Jun-05 23:21

Nilesh K.

15-Jun-05 23:21

Check here[^]

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: convert Variant to CString?

ThinkingPrometheus15-Jun-05 23:51

ThinkingPrometheus

15-Jun-05 23:51

wow
cool
thx to both of you

Re: convert Variant to CString?

Anonymous16-Jun-05 0:09

Anonymous

16-Jun-05 0:09

hi you can take the variable of bstr type and assign variant to the bstr and then pass the bstr value in messagebox .

It works

cheers

Re: convert Variant to CString?

James R. Twine16-Jun-05 8:34

James R. Twine

16-Jun-05 8:34

If you know that the VARIANT contains a BSTR you can get the BSTR, which is really a special form of a wide-character string, and pass it to the wide-character version of MessageBox:

MessageBoxW( hWndParent, vtMyVariant.bstrVal, L"The Caption", ( MB_ICONINFORMATION | MB_OK ) )

(You could also pass in a dereferenced pbstrVal.)

Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Tip for new SUV drivers: Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)

Sent data from Doc to dialog

mafuza15-Jun-05 22:58

mafuza

15-Jun-05 22:58

Hi..

I have a problem with my VC++ code,
the problem is i don't know how to send my calculation from Doc file to dialog file. I keep getting errors.
Here are my code in Dialog class :
void ImgViewerDlg::OnUpdate(CView *pSender, LPARAM lHint, CObject *pHint)
{
CImgViewerDoc *pDoc =GetDocument();
ASSERT_VALID(pDoc);

sasa = static_cast<cstring>(pDoc->jarak);
m_Angle = sasa;
}

void ImgViewerDlg::OnApply()
{
UpdateData(TRUE);
CImgViewerDoc *pDoc = GetDocument();
ASSERT_VALID(pDoc);

sasa = m_Distance;
}

the errors are :

mgViewerDlg.obj : error LNK2001: unresolved external symbol "protected: class CImgViewerDoc * __thiscall ImgViewerDlg::GetDocument(void)" (?GetDocument@ImgViewerDlg@@IAEPAVCImgViewerDoc@@XZ)

maybe it something to do with the declaration of Doc class. please help me..I want to sent my calculation from Doc to view in textbox on a dialog.

Thank in advance.

mafuza

Re: Sent data from Doc to dialog

Nilesh K.15-Jun-05 23:17

Nilesh K.

15-Jun-05 23:17

mafuza wrote:
void ImgViewerDlg::OnUpdate(CView *pSender, LPARAM lHint, CObject *pHint)

Is this a CDialog or CView class ?

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: Sent data from Doc to dialog

mafuza21-Jun-05 17:21

mafuza

21-Jun-05 17:21

sorry late reply because internet connection down.
for your question the answer is CDialog class.
so any suggestion?

Re: Sent data from Doc to dialog

Nilesh K.21-Jun-05 17:50

Nilesh K.

21-Jun-05 17:50

Defination for GetDocument is missing, Implement this in your ImgViewerDlg class and it should work fine.

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Picture on dialog based application

Rostfrei15-Jun-05 22:48

Rostfrei

15-Jun-05 22:48

Hello!

Can anyone tell me what is an easiest way to show some picture file (say .bmp) on dialog based application in Visual C++?

Best regards,

Rostfrei

Re: Picture on dialog based application

Nilesh K.15-Jun-05 23:06

Nilesh K.

15-Jun-05 23:06

Using CStatic would server your purpose.

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: Picture on dialog based application

Rostfrei15-Jun-05 23:32

Rostfrei

15-Jun-05 23:32

CStatic how? Can you please write 1 or 2 line of example code?

Regards,

Rostfrei

Re: Picture on dialog based application

toxcct16-Jun-05 0:14

toxcct

16-Jun-05 0:14

on you dialog editor, paste a bitmap control on your dialog... it is actually a CStatic control...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Picture on dialog based application

Nilesh K.16-Jun-05 0:45

Nilesh K.

16-Jun-05 0:45

Check this[^]

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

How to set TicFreq in a dialog box? Pls Help

Member 191502415-Jun-05 22:25

Member 1915024

15-Jun-05 22:25

I created 2 sliders in my dialog box. The problem now is that i can only set the range in whole number.eg (0-100). I need to set it in float .eg (0-1) Can anyone help me out?Below is part of my program.

BOOL GrowDialogBox::OnInitDialog()
{
CDialog::OnInitDialog();

// TODO: Add extra initialization here
m_slider3.SetRange(0,1);
m_slider3.SetTicFreq(0.01);
m_slider4.SetRange(0,1);
m_slider4.SetTicFreq(0.01);
minnSliderPos = 0;
maxxSliderPos = 1;
// For displaying numbers on the box
s3.Format("%f",0); // Set it to 0 for min and 1 for max
m_EDIT3.SetWindowText(s3);
s4.Format("%f",1);
m_EDIT4.SetWindowText(s4);

return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}

My warning received is
warning C4244: 'argument' : conversion from 'const double' to 'int', possible loss of data

Re: How to set TicFreq in a dialog box? Pls Help

RChin15-Jun-05 22:42

RChin

15-Jun-05 22:42

First off, the control does not allow float parameter. Once this is known, you can stop trying to fit that square peg in that round hole.
What you will need to do, and I suspect other have done, is to scale your input to an appropriate integer range.
So lets say that you want your slider to show be in the range 0 - 0.1. Then what you can do is multiply all your values by 100, and set the slider range to be 0-100. Use the reverse technique when retrieving values from the slider (divide by 100, to get the true value).

Hope this helps

I Dream of Absolute Zero

Why Release version don't Run.

tranglt15-Jun-05 22:02

tranglt

15-Jun-05 22:02

Hi all!
Can you hepl me?
I have a problem When I compile my project.
my Project was written by MFC/Single Doc/View.
I use Window 2000 EN, and Visual C++ 6.0 EN.
My project was compiled to Release and Debug successfully.
In Window2000 EN,The Release version run very well. But it can't run In Window2000 JP.
However, The Debug version run in two the environments. Then I can use Break points.
Do you know the bug.
Thanhx you very much. Roll eyes | :rolleyes:

LiLiTrang

Re: Why Release version don't Run.

One Stone15-Jun-05 22:14

One Stone

15-Jun-05 22:14

http://www.codeproject.com/debug/survivereleasever.asp[^]

Re: Why Release version don't Run.

Nilesh K.15-Jun-05 22:59

Nilesh K.

15-Jun-05 22:59

Have you taken care of your language resources ?

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

AllocConsole

mcsherry15-Jun-05 21:49

mcsherry

15-Jun-05 21:49

When I use the WriteConsole method I always get a "First-chance exception in FileBinary.exe (KERNEL32.DLL): 0xC0000005: Access Violation." in the output window within Visual Studio, however the text that I sent in the WriteConsole method appears correctly on the console window.

Does anyone know what I am doing wrong (I've attatched some sample code below which just sends an end of line to the console, AllocConsole has already been called elsewhere in my program)?

LPDWORD s = 0 ;

CString myStr = "\n" ;

HANDLE h = GetStdHandle ( STD_OUTPUT_HANDLE ) ;
WriteConsole ( h,
myStr ,
myStr.GetLength ( ),
s,
NULL ) ;
cheers,
Andy

Re: AllocConsole

One Stone15-Jun-05 21:55

One Stone

15-Jun-05 21:55

LPDWORD is a pointer. You need to pass a valid memory location to the WriteConsole function, not just a random pointer. Also, cast the CString to a LPCTSTR manually, before turning it into a VOID*.

DWORD s = 0 ;
CString myStr = "\n";
HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
WriteConsole(h, (LPCTSTR)myStr, myStr.GetLength(), &s, NULL);

Re: AllocConsole

mcsherry15-Jun-05 22:12

mcsherry

15-Jun-05 22:12

thanks for your very quick reply, I'll give that a try.

Andy

Create Trial Version of an appliation

Sudhir Mangla15-Jun-05 21:33

Sudhir Mangla

15-Jun-05 21:33

I wants to crate Trial Version of My appliation.

Can anybody suggest a good way crate Trials.

storing information in registry is very unsafe.
please suggest any other option

Sudhir Mangla

http://Programmerworld.net

(Free books , articles , Source Code and Programming Tools and Utilities)

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