CButton with Bitmap Transparency - C / C++ / MFC Discussion Boards

Jim Crafton9-Oct-05 4:56

9-Oct-05 4:56

OK, thanks!
However when I tried to build with it, I get link errors saying it can't find msvcrtd71.lib (or something like that).
I tried a simple test with the following:

//test.cpp
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

extern "C" {
__declspec(dllexport) void doit();
}

void doit()
{
	int f = 90;
	f += 345;
}

When I build this with /MDd (or /MD) I note that despite the fact that NO CRT code is used (as far as I can tell), it automatically links and uses the MS CRT DLL anyways!!!

My understanding is that you cannot use STL in DLL's that are NOT built with "Multi-threaded DLL" code generation options. So if you have DLL A and it uses STL (and has functions that use std::string) and have DLL B, that also uses DLL A, and both use std::string, then you must generate them using the "Multi-threaded DLL" code gen option.

What I remember is that if you just use the "Multi-threaded" option (i.e. static linkage to the CRT) then the strings will become corrupted.

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Modeless dialog communicating with parent dialog

fjlv20058-Oct-05 9:08

fjlv2005

8-Oct-05 9:08

Good day,

I have a parent dialog instatialing a modeless dialog. My modeless dialog has a public function that updates the progress bar. Everytime I call tmpmodeless->UpdateProgressBar(step) where step is a number to increase, the progress bar show increase on display. I have also a public function in modeless dialog that updates the text for displaying the status tmpmodeless->UpdateMessageStatus(CString mymsg) but I doesnt update the display..

Here is my code:
// Variables of modeless dialog
CProgressCtrl m_ctrlProgress; // Created using MFC Class wizard so it sure points to the
// control id of progress bar.
CStatic m_statusdone; // Created using MFC Class wizard so it sure points to the
// control id CStatic control id. Also sure that Visible property is checked.

CMyParentDialog::MyInitialize()
{
CMyModelessDialog* tmpmodeless=new CMyModelessDialog(this);
tmpmodeless->Create(CMyModelessDialog::IDD);
tmpmodeless->ShowWindow(SW_SHOW);
tmpmodeless->UpdateProgressBar(10); //OK is reflects on screen
tmpmodeless->UpdateMessageStatus("Help me step 10"); doesnt change display..
tmpmodeless->UpdateProgressBar(20); //OK is reflects on screen
tmpmodeless->UpdateMessageStatus("Help me step 20"); still doesnt change display..
}

void CMyModelessDialog::UpdateProgressBar(int pStep)
{
m_ctrlProgress.SetPos(pStep);
}

void CMyModelessDialog::UpdateMessageStatus(CString mymsg) //Doesnt work.. why???????????????
{
m_statusdone.SetWindowText(mymsg);
UpdateData(TRUE);
}

Still Doesnt appear even if I manually put m_statusdone.SetWindowText("Test") under UpdateProgressBar because UpdateProgressBar sure does works on setting progressbar.

Is there something Wrong with CStatic control????

Thanks.

Re: Modeless dialog communicating with parent dialog

Jose Lamas Rios8-Oct-05 14:32

Jose Lamas Rios

8-Oct-05 14:32

fjlv2005 wrote:
void CMyModelessDialog::UpdateMessageStatus(CString mymsg) //Doesnt work.. why???????????????
{
m_statusdone.SetWindowText(mymsg);
UpdateData(TRUE);
}

Why are you calling UpdateData(TRUE) at that point? Was it just for testing purposes?

Make sure your static control uses an identifier different than IDC_STATIC (i.e, -1)

--
jlr
http://jlamas.blogspot.com/[^]

Re: Modeless dialog communicating with parent dialog

fjlv20059-Oct-05 18:42

fjlv2005

9-Oct-05 18:42

Good day,

Yes Im sure im using ID which is not IDC_STATIC. UpdateData is just for testing...
Why does it doesnt update the display for my modesless dialog??

How in CEdit to install the cursor in anchor point?

pup20028-Oct-05 7:36

pup2002

8-Oct-05 7:36

How in CEdit to install the cursor in anchor point?
C++ MFC

SetSel installs the cursor in an active end and scrolls the text, I should place(install) the cursor in anchor point, for auto replacement.

Re: How in CEdit to install the cursor in anchor point?

Mircea Puiu8-Oct-05 21:03

Mircea Puiu

8-Oct-05 21:03

Could you go a little bit more ... in detail ?

SkyWalker

Re: How in CEdit to install the cursor in anchor point?

John R. Shaw8-Oct-05 21:39

John R. Shaw

8-Oct-05 21:39

SetSel(...);

Just make the starting position and ending position the same (anchor point).

The carat (anchor) position is the starting position.

Note: You can reverse the positions passed to SetSel(...) by reversing the starting and ending points..

Under Windows the cursor position is the mouse arrow position and not the position of the text cursor (that's called a caret).

INTP
Every thing is relative...

CButton with Bitmap Transparency

fjlv20058-Oct-05 5:02

fjlv2005

8-Oct-05 5:02

Hello,

I have a CButton created dynamically with bitmap:
CButton
m_mybutton.Create(NULL,WS_CHILD|WS_VISIBLE|BS_OWNERDRAW,CRect(1,87,110,107),this, ID_BTNHEADBOOKMARK);
m_mybutton.LoadBitmaps(IDB_LISTHBOOKMARK, IDB_LISTHBOOKMARK, IDB_LISTHBOOKMARK, IDB_LISTHBOOKMARK);

The image have some area with Color RGB(255,0,255).
I wanted those area with that color above to be transparent.

How can I do it? Confused | :confused:

Hope i could get a response ASAP (if possible )

Also im using EVC, you can try it Visual Studio and if works, i'll try it to EVC3.0.

Thanks you very much.

Re: CButton with Bitmap Transparency

Lane Yu8-Oct-05 8:24

Lane Yu

8-Oct-05 8:24

My suggestion:

Derive a subclass from CButton, modify its style as owner-draw.
Overwrite the DrawItem() and use TransparentBlt() to paint the bitmap by yourself.

Lane

Re: CButton with Bitmap Transparency

fjlv20058-Oct-05 9:14

fjlv2005

8-Oct-05 9:14

Lane,

I understand how to override DrawItem by creating a class derived from CButton, however there no TransparentBlt API in EVC3.0. Anyway to do TransparentBlt? Frown | :(

Thanks Lane

Re: CButton with Bitmap Transparency

PJ Arends8-Oct-05 18:23

PJ Arends

8-Oct-05 18:23

NewVCbie wrote:
Anyway to do TransparentBlt?

You can use the "True Mask" method. It is the method used by windows to draw icons. It involves creating a black and white mask bitmap that uses white as the transparent part and black as the opaque part. You can have a look at my article at http://www.codeproject.com/bitmap/pjaimage.asp[^] where I use the method to draw transparent bitmaps. Look at the CPJAImage::DrawTransparent() method.

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Re: CButton with Bitmap Transparency

Lane Yu8-Oct-05 18:46

Lane Yu

8-Oct-05 18:46

You can use several call of BitBlt to implement.

Just type "Transparent Bitmap" in Google, you'll find many articles.

One in CodeProject:
http://www.codeproject.com/bitmap/transbitmapmask.asp[^]

Lane

use of extern keyword

swaapu8-Oct-05 2:46

swaapu

8-Oct-05 2:46

Hi!
I am working on MFC SDI application.
can anybody tell me any good example of using extern keyword. can extern be used for passing value of any string variable from one class to another. If it can be used, then how?

thanx

Re: use of extern keyword

G Haranadh8-Oct-05 3:08

G Haranadh

8-Oct-05 3:08

swaapu says:can extern be used for passing value of any string variable from one class to another?

No it is not possiable using extern.
extern is for different purpose.

if you want to declare later and but if you want to use before itself then use key word extern.

Nice talking to you. Blush | :O

Re: use of extern keyword

Bob Stanneveld8-Oct-05 7:02

Bob Stanneveld

8-Oct-05 7:02

Hello,

The extern keyword is used to say to the compiler that you are using a variable declared in another translation unit. See the following for example:
You have one translation unit where you define your variable

// file1.cpp
int g_nSomeInt = 0;

And another one where you want to use the variable

// file2.cpp
extern int g_nSomeInt;

void DoFoo()
{
    g_nSomeInt++;
}

This is how extern can be used. It is adviced though too use accessor functions instead of the extern keyword.

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Re: use of extern keyword

John R. Shaw8-Oct-05 22:14

John R. Shaw

8-Oct-05 22:14

The extern keyword simply states that the variable or function is declared in a seperate translational unit. That is it is declared and defined in a seperate file from the one that depends on it.

Declaring a function prototype as external, only serves to inform the coder that it is declared and defined in another file.

Defining a variable as external, informs the complire that it is declared and defined golobaly in another file. The difference between a function protype and a global variable, is that a global variable must be declared external and a prototype is external by default.

I've workd with C code that required alot on global variables (dealing with hardware specific addresses). In that case a file was set off to the side to define all the hardware specific data (global variables), which needed to be declared as extern.

INTP
Every thing is relative...

how to use ADO to store and retrieve image data from Oracle using VC++

snprani8-Oct-05 2:07

snprani

8-Oct-05 2:07

Hi
Urgent plz. Help me in how to use ADO to store and retrieve image data from Oracle using VC++.

Thanks in Advance

Re: how to use ADO to store and retrieve image data from Oracle using VC++

G Haranadh8-Oct-05 9:53

G Haranadh

8-Oct-05 9:53

Try with stored procedures using folowing link.
http://www.psoug.org/reference/dbms_lob.html

Nice talking to you. Blush | :O

How to use CByteArray to store images into PostgreSQL database from VC++

snprani8-Oct-05 2:06

snprani

8-Oct-05 2:06

Hi
How to use CByteArray to store images into PostgreSQL database from VC++.
Help me.

Thanks

GNFS and SNFS

RedDragon2k8-Oct-05 1:20

RedDragon2k

8-Oct-05 1:20

Hello,

does anybody here know a good C++/C Implementation of the GNFS(General Number Field Sieve) or the SNFS (Special Number Field Sieve) Algorithm ?

With best regards,
Benedikt

Interaction between dialog boxes

swaapu7-Oct-05 23:58

swaapu

7-Oct-05 23:58

Hi!!
I am working on an SDI MFC application. I have two dialog boxes. I want to pass some File name from one dialog box to another on clicking OK command button. The file name has to be displayed on the text box of second dialog, when the second dialog appears on the screen .
Can any body tell me , how to declare variables and wat functions to use. I am new to MFC.
Thanx

Re: Interaction between dialog boxes

Intertherain8-Oct-05 2:20

Intertherain

8-Oct-05 2:20

there are two methods
(1)use CWnd::SendMessage( UINT message,
WPARAM wParam = 0,
LPARAM lParam = 0
);
(2)you can add a variable in the CMainFrm. pass the File name of the first Dialog to the variable.then the second
Dialog access it.

libo

Re: Interaction between dialog boxes

swaapu8-Oct-05 2:50

swaapu

8-Oct-05 2:50

Hi!
Thanx for giving responses to my problem.
You had told me:
"add a variable in the CMainFrm. pass the File name of the first Dialog to the variable.then the second
Dialog access it."

But, please tell me , that ,"how to pass the file name of the first dialog to the variable..."

Can u tell me some code as I am new to mfc programming
Thanx a lot for ur valuable time

Re: Interaction between dialog boxes

Mircea Puiu8-Oct-05 21:12

Mircea Puiu

8-Oct-05 21:12

You have probably two classes derived from CDialog for your dialogs. Let them be (it's just an example) CYourDlg1 and CYourDlg2.

I guess you are using them like that (supossing they are modal):

CYourDlg1 dlg1;
 .
 .
dlg1.DoModal()

and

CYourDlg2 dlg2;
 .
 .
dlg2.DoModal()

respectively.
Now, let's say you want to pass some CString data (containing a fully qualified name of some file), which you get from dlg1, to dlg2.
You must add some data member to each of those two classes: CString m_strFile.
In the OnOK() function of CYourDlg1 you add the line:
m_strFile = ... with the dots replaced by something you are using there ( Smile | :)

).
Before calling dlg2.DoModal(), you initialize the data of dlg2 with data from dlg1:
dlg2.m_strFile = dlg1.m_strFile

SkyWalker

-- modified at 3:13 Sunday 9th October, 2005

(Urgent help need)Enabling UNICODE support in VC++

Amit j Patil7-Oct-05 22:21

Amit j Patil

7-Oct-05 22:21

Hi All
I am writing one simple application atht will read unicode data from one file. For this i change project setting to _UNICODE. but it gives me error.
So tried solution given in MSDN : THe lines are as given below
Note The Unicode versions of the MFC libraries are not copied to your hard disk unless you select them during a Custom installation. They are not copied during other types of installation. If you attempt to build or run an MFC Unicode application without the MFC Unicode files, you may get errors.
To copy the files to your hard disk, rerun Setup and click Add/Remove Features. Click Language Tools, click Visual C++, and click Visual C++ Class & Template Libraries, and select both ATL MFC Shared Libraries Unicode and ATL MFC Static Libraries Unicode.

but when i run setup(or rerun setup) i doesnot get Add/Remove Features

option anywhere during installation.
CAn ny body help me what to do.
I am installing Micrisoft Visual C++ 6.0
Thanks in advance

Regards
Amit

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