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I'm a Windows programming beginner, been programming DOS for some time, starting to make the switch and I'm having a niggly bit of trouble trying to display a messagebox immediately after a dialog.DoModal() . Has anyone out there seen this type of behaviour where any messagebox call after a dialog box fails to be displayed? Did I miss something obvious?
The application was created as an simple MFC GUI app.
Your help is much appreciated.
//*********************************************************************
dlg.m_strWarningtext.Format(strMsgBuf);
nResponse = dlg.DoModal();
// >>>>> At this point, any messagebox call returns IDOK without even being displayed.
if (nResponse == IDOK)
{
// Do stuff
sprintf(strMsgBuf,"Messagebox text ");
nRetVal = MessageBox( NULL, (LPCTSTR)strMsgBuf, "Error", MB_OK | MB_ICONERROR );
// >>>>> nRetVal is always == IDOK and the messagebox won't display
}
else if (nResponse == IDCANCEL)
{
// Do stuff
}
//*********************************************************************
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I don't know the answer, but if you're using MFC, replace the last two lines with
nRetVal = AfxMessageBox("MessageBox Test");
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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Hello, the codegurus around the world.;)
If you use the debugger, you may find the reason.
I think that ::MessageBox() should be called in if (response == IDOK)
The other way is that we put MessageBox() in CMyDialog::OnOK().
We often tend to use MessageBox() to check something.
But, TRACE, TRACE1, and so on works also in the debug mode.
void CMyDialog::OnOK()
{
MessageBox("OK button works", "Test");
TRACE ("OK button works")
CDialog::OnOK();
}
Have a nice day!
-Masaaki Onishi-
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Just spent 10 minutes putting together an eloquent version of this question together only for everything to screw up when I clicked the Submit button, so here is the short version.
Apologies for dumbness of question, 3 years as Consultant has left brain as mush and programming memory has faded. Decided to get back in to programming and am working through tutorials to get up to speed. Starting with do nothing dialog application that contains many of the Controls available so I have at least implemented each control and have an understanding of them.
Right now I am attempting to use the Picture Control and obviuosly am having some trouble or I wouldn't be here. MSDN CD's that shipped with Visual Studio 6 have shed no light and can't find any Code Project articles that answer my question. Picture control Properties tell me I can use Icon, Bitmap or Enhanced Metafile. If I add a control variable via ClassWizard it is CStatic, looking up it's Member Functions I find only functions for Bitmaps (just looked at Class Members and found the functions for Icons and Enhanced Metafiles).
This shortens and slightly changes the question. These functions are using HICON, HBITMAP etc. which means it isn't loading the separate files from disk but must have the files loaded via resources(???) prior to compiling.
Is this correct?
How do I load the relevant files?
If I'm not even close what should I do?
Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018
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You can use ::LoadImage to load an image from disk if it's a .bmp or .ico ( which is a bmp with a bit of extra info ).
If you have an image as a resource and are using MFC, you can do this
CBitmap bmp;
bmp.LoadImage(IDB_BITMAP);
a CBitmap will cast to HBITMAP, if not it has a m_hbitmap member variable and a GetSafeHandle() method ( which needs casting ).
You can also set the bitmap from resources in the dialog editor.
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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I am using a CComboBox with some of Chris's mod's to make it so I can enter text
and have it populate the CEdit with the CComboBox content as I am typing.
(eg: Days of the Week, if I typed 'Mond' it would display the 'ay' as selected)
This is all good stuff - Thanks Chris.
However, I would like the DropDown to work at the same time. I added:
if (!this->GetDroppedState())
this->ShowDropDown();
to the OnEditUpdate method, but no matter which methods I try none seem to allow
the typing of text to "Highlight the selection of closest match".
I really don't want to implement my own dropdown window (as in the excellent
ComboTree example), so I was hoping there was some cool way to get the Handle to
the DropDown.
If you have any suggestions, or if you actually KNOW the solution (hope hope),
please post a reply.
many thanks
Julien.
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to get the handle to the dropdown, why not try the ChildWindowFromPoint() function specifing a point just below the edit window? 
I don't know, just a suggestion
---
Multitasking: Screwing up several things at once.
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I've finished my ID3 tag editor ( I intend to ask permission from the person whose base code I used for the ID3 stuff and then submit it ), but I have one final problem. It compiles and runs in debug mode ( and works a treat, I've been using it ), but in release the linker complains that _main is not defined. The program was created with the appwizard for WTL that was in the OCt SDK, and the main dialog class is called CMain, so I don't know if it's getting confused, but I went through the settings looking for a discrepancy and could not find one. The debug build is 370 k, the release build ( after I put a dummy main() function in that just returns 0 ) is about 74.
The release build runs and gives me a dialog, but if I click a button or my listctrl, the whole thing crashes. Which is why I think the compiler is confused as to what constitutes my main dialog class.
If anyone has any suggestions, I sure would appreciate it...
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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I know this is in the KB somewhere, but the quick synopsis is that you are using some CRT string functions, but by default release mode ATL projects don't link with the CRT, so that's why you get an unresolved symbol. Go to your project options and remove the ATL_MIN_CRT symbol from the preprocessor definitions to fix this.
--Mike--
http://home.inreach.com/mdunn/
All your base are belong to ME~!
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Hi,
I want to monitor the audio recording level, and change it. Like in the Windows Volume Control App.
Anyone got a hint to what functions I should take a look at. I have been searching through the MSDN, but can't seem to find the right ones...
My problem is that I record my old (pre CD) records using CoolEdit, and save them as .wav files, and to change the recording level I have to use the Windows Volume Control. But, the sliders in here are small with a very rough control, so I want to make an app with some bigger (longer) sliders with a more granular control...
I just need a hint in the right direction...
- Anders
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You want to use the Mixer API, but be warned.. It's a nightmare. It's very involved and requires a lot of work, so don't expect to get anything working very quickly.
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Thanks
- Anders
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<<< In the name of GOD >>>
Hi there.
I want to read from file.
I haven't any problem, but for it, i used of CString variable for get data from file.
This variable define in global mode.
Now i want to get data to LPSTR variable, in global mode, but compiler give me error.
This is my code about CString variable:
CString szText; // Global variable
.
.
.
void CEditorDlg::Loading()
{
CFile file;
file.Open("Hadi.txt", CFile::typeBinary | CFile::modeRead);
file.Read(szText.GetBufferSetLength(file.GetLength()), file.GetLength()); // I want to put LPSTR variable instead CString variable.
file.Close();
}
Thanks for reply.
Hadi Rezaie
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Have you considered using CStdioFile?
--
Alex Marbus
www.marbus.net
But then again, I could be wrong.
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hmmmmm.
Ok, i must use CStdioFile for it.
But i want to know which is better and faster to use CFile or CStdioFile and why ???
Thanks.
Hadi Rezaie
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I'm not sure what's faster; using CFile and your own routine to read/write plain text line-by-line, or using CStdioFile and use ReadString and WriteString. If you write your own functions to do this, you'll probably end up doing the same thing as CStdioFile does internally (I haven't looked at the MFC code yet, no development-environment on the machine I'm currently writing this message).
CStdioFile is the right class if you only want to read/write plain text from/to file. It's very easy to use. Saves you a lot of thinking
G'luck
--
Alex Marbus
www.marbus.net
But then again, I could be wrong.
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Ok,
I have two other questions:
Q1. What is Buffer in file that use for writing and reading from file ?
Q2. Can i use of typeBinary flag for open the file in CFile object ?
Hadi Rezaie
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Usage of the GetBufferSetLength member function of CString class is
CString diva("Madonna");
LPTSTR ptrdiva = diva.GetBufferSetLength( 10 );
try using it like this
file.Read((void *)szText.GetBufferSetLength(file.GetLength()), file.GetLength());
as Read requires a (void *) i.e. a void ptr...
Dharne Atul
---------------------------------------
do not rely on any code till ya try it
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Maybe its 3:30 and My Head is Not Straight, But Im having trouble Figureing this one out.
This is my First VC++ App and things are going quite well. 
My Problem is I have a CListCtrl that is representing "Tasks" in a Queue. I would like the USer to Be Able to Delete any number of Selected Items in the Queue. So if they Select Five Items and Click "Remove" those Items and Their Corresponding Data will be deleted.
My problem is Navigating Through the Selected Item List.
In Other CListCtrls I use I use the Same Method of moving through the Item List with no Problem.
Whats the best Method for Deleteing Items from a CListCtrl that are Selected.
GetNExtSelected or using the LVIS_SELECTED mask to identify selected Items and remove them?
quick sample code would be appreciated.
recurse.org - Recusion For the Rest Of Us.
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Assuming m_ctrlTaskList is the Listcontrol you use:
POSITION pos = m_ctrlTaskList.GetFirstSelectedItemPosition();
while (pos != NULL)
{
int nPosition = m_ctrlTaskList.GetNextSelectedItemPosition(pos);
m_ctrlTaskList.DeleteItem(nPosition);
}
HTH
--
Alex Marbus
www.marbus.net
But then again, I could be wrong.
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Thats what my code looks like exactly except for a TRACE I did on Position to Check for NULL.
However, I did use your code exactly and my problem still remains. I am only deleteing every other
Item that is selected, SO if I am deleteing item 123456 which are all selected using that code above leaves
246 intact and still selected. Am I a BOOB? This is irking me especially since its one of my last bugs, and I cant implement anything else until this is solved.
Here Ill even copy out my code for you.
I really need help on this.
void CChildView::OnRemItems()
{
POSITION pos = m_SpewWnd.QueueView.GetFirstSelectedItemPosition();
while (pos != NULL)
{
int nItem=m_SpewWnd.QueueView.GetNextSelectedItem(pos);
m_SpewWnd.QueueView.DeleteItem(nItem);
}
Invalidate();
}
Maybe you could also tell me how to get that code selected while posting..
=)
recurse.org - Recusion For the Rest Of Us.
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I am only deleteing every other Item that is selected, SO if I am deleteing item 123456 which are all selected using that code above leaves 246 intact and still selected.
That's because when you delete item 1, the result is that 12345 are selected (2-6 shift down to 1-5), so the next time through your loop you skip the new item 1, item 2 (previously 3) gets deleted, and so on.
Easy way to fix: In your loop, get the first selected item and delete it. Then get the first selected item again and delete it. Repeat until there are no more selected items. This may be slow if your list is big, though.
Snazzier way to fix: Loop thru and make a list of the indexes of all selected items. Then delete them working from the highest index to the lowest.
--Mike--
http://home.inreach.com/mdunn/
All your base are belong to ME~!
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The post Below this describes how to do this Task Recursively, but that has a lot of overhead if your list of selected Items is really large. I figured out the "mIchael Dunn" method sometime this morning and that works very well. Using GetFirstSelected() over and over. The List Method is probably the best way to go however.
Thanks EVERYONE.
recurse.org - Recusion For the Rest Of Us.
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Mike,
Can you give a bit more info regarding the "Snazzier way to fix". I need to implement this and i'm having the same problems.
Thanks,
Frank
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Okay, I got it working, BUt this is how.. good old recursion.
All I did was read to the end of the selected list and then recursively delete from there.. heres the code:
Does anyone have a better IDEA ?
void CChildView::OnRemItems()
{
POSITION pos = m_SpewWnd.QueueView.GetFirstSelectedItemPosition();
DelQ(pos);
Invalidate();
}
void CChildView::DelQ(POSITION pos)
{
while (pos != NULL)
{
int nItem=m_SpewWnd.QueueView.GetNextSelectedItem(pos);
DelQ(pos);
m_SpewWnd.QueueView.DeleteItem(nItem);
}
}
Is this the asinine way to do this? I like recursion But I dont think MS had this in Mind at all.
recurse.org - Recusion For the Rest Of Us.
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