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I think first you should add a button in dialog and on handle of this button write the code below
void CReadFileDlg::OnReadFile()
{
CEdit* m_EditArray[10];
CStringArray FileArray;
char cTemp[256];
ifstream fin;
fin.open( _T("C:\\FileRead.txt"), ios::in|ios::nocreate );
while( !fin.eof() )
{
fin.getline( cTemp, 256, '\n' );
CString csChartoString;
csChartoString.Format( "%s", cTemp );
if( csChartoString != "" )
{
FileArray.Add( csChartoString );
}
}
int top = 10;
int bottom = 30;
for(int i = 0; i < 10; i++)
{
m_EditArray[i] = new CEdit;
DWORD dwStyle = WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON;
m_EditArray[i]->Create(dwStyle, CRect(10,top,100,bottom), this,100+i);
m_EditArray[i]->ShowWindow(TRUE);
top += 30;
bottom += 30;
}
int nArraySize = FileArray.GetSize();
int nPos = 0;
for( int nIdx= 0; nIdx < nArraySize; ++nIdx )
{
m_EditArray[nIdx]->SetWindowText( FileArray.GetAt( nIdx ));
}
}
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<b>In process / progress of being solved</b>
WM_DEVICECHANGE sets wParam to DBT_DEVNODES_CHANGED to update list (tree?) nodes.
No other info is available then. I have not retrieved any device list, so it is useless for me.
To receive DBT_DEVICEARRIVAL it is necessary to first use RegisterDeviceNotification.
At this point no other help is required.
Thanks
Vaclav
I need some help / hints with implementing WM_DEVICECHANGE in MFC Document /View setup.
I have managed to intercept the WM_DEVICECHANGE in CmainFrame message map and process it .
The problem m is that the wParam is nowhere near the 0x8xxx, but it is plain “7” and the lParam is 0.
I went thru the Dbt.h and cannot figure out what is the wParam = 7 telling me.
Here is the code snippet and if it is not formatted to you liking – I am sorry , but I write my stuff in OpenOffice and than copy it to CodeProject so it cannot be formatted properly.
<b>I just need some troubleshooting pointer / suggestion how to analyze these mysterious parameters. </b>
Maybe CmainFRame is not the place to start, but I got same parameters values when I used Cdialog message map directly.
Any help is as always appreciated.
Cheers
Vaclav
ON_MESSAGE(WM_DEVICECHANGE, OnMyDeviceChange)
bool CMainFrame::OnMyDeviceChange(WPARAM wParam, LPARAM lParam)
{
TRACE("\nLRESULT CMainFrame::OnMyDeviceChange(WPARAM wParam, LPARAM lParam)");
TRACE("\nwparam %i ",wParam);
TRACE("\nlParam %i ",lParam);
AfxMessageBox("!!!! CMainFrame::Device detection ");
// pass WM_HARDWARE to view
GetActiveView()->PostMessage(WM_HARDWARE,wParam,lParam);
….
Addendum
JUst found this info, so the additional question is - is CMainFrame "top window" and if not will RegisterDeviceNotification solve this ? I shall try it next.
The DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE events are automatically broadcast to all top-level windows for port devices. Therefore, it is not necessary to call RegisterDeviceNotification for ports, and the function fails if the dbch_devicetype member is DBT_DEVTYP_PORT.
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It is the DBT_DEVNODES_CHANGED[^] event.
Your code and text can be formatted properly. It must be done manually after pasting (it does not care if pasting from OpenOffice or a plain text editor but you should remove HTML tags when pasting from Ooo). Select text with mouse and use the buttons above the edit window to apply specific formatting. If you know HTML, you may also type the HTML tags. Check the preview to see how it looks.
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See here [^]about halfway down.
From MSDN: DBT_DEVNODES_CHANGED
A device has been added to or removed from the system.
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Thank you, obviously I have not look all the way to the end of the page!
However, what the dickens is " ring3 people" note talking about?
So when "new node is detected / chaged" is not same as
DBT_DEVICEARRIVAL A device has been inserted and is now available.
Mr MS - I am not sure this note is in English!
and to get the device more work is necessary???
I am not sure I can figure that out, getting tired of this USB mess.
/*
* Message = WM_DEVICECHANGE
* wParam = DBT_DEVNODES_CHANGED
* lParam = 0
*
* send when configmg finished a process tree batch. Some devnodes
* may have been added or removed. This is used by ring3 people which
* need to be refreshed whenever any devnode changed occur (like
* device manager). People specific to certain devices should use
* DBT_DEVICE* instead.
*/
#define DBT_DEVNODES_CHANGED 0x0007
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Vaclav_Sal wrote: I write my stuff in OpenOffice and than copy it to CodeProject so it cannot be formatted properly.
Of course it can be formatted properly, just select all the code and use the code link above the edit window, or manually put a <pre lang="c++"> tag in front of it, and a </pre> tag at the end.
One of these days I'm going to think of a really clever signature.
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Thank you, you are right.
Vaclav
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Device notification requires a two stage process (dredging long term memory here so might not be exact) whereby you first register for notification by type (class UID) and then by handle.
This gives you all the messages relevant to a device.
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i have a appilcation consists of thousands lines of code. when i do some specific operation, i.e. open a very large document, the app almost eats up my memory. but after a while, the memory is given back. i have tested the codes and found no memory leak.
so, my problem is how to find the codes who eat up my memory.
any one can help me?
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Apart from debugging, adding logging to your application or running some code analyzer[^] there is no answer.
One of these days I'm going to think of a really clever signature.
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Falconapollo wrote: so, my problem is how to find the codes who eat up my memory.
Are you using the new operator?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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yes. but there is no memory leak in my codes as i wrote in my post.
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Are you allocating memory to hold the "very large document?"
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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i'm not sure. since the codes are huge. i have no idea to find out the problematic codes.
so, what's your recommendations?
i think there are some existing tools to do that. do you know some?
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First, when you do a malloc or new, you extend the heap. For optimization reasons, the memory manager may not return the heap back to the OS immediately. When needing to allocate especially large chunks of memory, you can use a low level API directly or, with some compilers/CRTs, a different heap (for Windows, here's an article discussion various options: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366533%28v=vs.85%29.aspx[^].)
Also note that if you allocate memory and sit around, the OS may page it out. To understand the difference in Windows, look into "private bytes" and "working set".
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most of the time this problem is due to memory leak u check it again also check may be there is some large array defined in the code.like int arr[1024*1024][1024*1024].
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application verifier is a good start.
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I want to ask you something: what would you use for image processing and more important, convert images from an format to other ? I am using MFC, and I was thinking of GDI+, but I didn't find so many examples to how to convert images ...
I see here so interesting controls, CBitmapEx, CxImage, CImageStone, but I don't know what is proper to do the job ... I will appreciate any hint.
Thank you for your time.
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Did you look into Bitmap.ConvertFormat()[^] in GDI+?
One of these days I'm going to think of a really clever signature.
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No, I didn't look over by now ... Thank you for your interest, so you suggest to use GDI+ ... I didn't try to load some not common image file, .raw, .tiff multipage, etc. ... I don't know if does function ...
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Flaviu2 wrote: so you suggest to use GDI+
No, I just asked if you had looked at that function and if it solved your problem. Your question is not particularly clear, i.e. what do you want to convert from, and what do you want to convert to? I am sure that Google could find you lots of information if you were more specific about your requirements.
One of these days I'm going to think of a really clever signature.
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No, I didn't solved yet. I want a class/library that could convert from an image format to many kinds of image formats ...
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Then you need to do some research (using Google) to find one.
One of these days I'm going to think of a really clever signature.
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I was looking here[^], I think this is what I need it ... thank you for your time.
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there are many libraries out there.
coughcough
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