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Ok, got it thanks. Well everything seems to work fine. Except writing to the file.
Here's what I'm doing.
I load the (cropped image)CBitmap into a DC. That works.
So then I load (LoadImage()) a blank bmp file into another CBitmap to put into the second DC.
Then I BitBlt() the DC's.
In theory, from what I understand it should blit to the file through the DC. But it's not working, the blank image stays blank.
Is what I'm doing possible?
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Mike Savoie wrote:
from what I understand it should blit to the file through the DC
Sorry - you got it totally wrong. BitBlt changes bitmap in memory. Changes are not saved to disk; in fact, AFAIK, there's no Win32 API which writes .bmp files. You have implement it yoursel. Check MFC sample DIBLOOK for code which saves bitmaps.
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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I've developed an Activex control in VC++. Now i want to use it in a VB application. The control fires three types of events. In VB application, whenever the event is received, i displayed a message box. Here is the problem: Whenever event is received and Mesagebox is displayed, the next event may fired from the control, but this event is not captured by the VB application, because it is locked showing the dialog box on previous event.
Can anyone tell me how can i modify my code so that this problem is resolved and whenever new event is received, a new dialog box comes "above" the previous one ???
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Show each messagebox in a different thread.
-----------------------
New and improved: kwakkelflap.com
My first CP article: Pseudoregisters[^]
"When I hear of Schrödinger's cat, I reach for my gun." - Stephen Hawking
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Or create a non system or task modal messagebox.
Todd Smith
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I put breakpoints and TRACEs in my code. With breakpoints, execution steps along quite a ways before the crash I'm debugging happens. Without breakpoints, if I run it with F5, during which I expect to see TRACE statements occur, the app crashes before any trace statement is visible. Isnt this the way we use TRACE? What am I doing wrong? If not, what might be the cause of this weird behavior?
Appreciate your help,
ns
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If you emit *lots* of data with TRACE, some may be lost. This is 'by design' - see KB article Q218007.
However, the symptoms you've described suggest some problem with multiple threads. Are you multithreading?
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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No. Its single threaded. I just had three TRACEs in this routine..
the problem is that the app behaves very erratically from run to run (always crashes due to the erratic behavior). What it should do is populate a few database columns with entries for all records, then proceed. I do this, and sometimes one column is filled. Sometimes 2...but never all. Often no columns that I need done are populated.
itNotIn1 = setNotInSet1.begin();
for (; itNotIn1 != setNotInSet1.end(); itNotIn1++)
{
TRACE("before pop1");
CString temp = *itNotIn1;
m_db1.PopulatedontCares(*itNotIn1);
TRACE("After pop1");
}
In my latest attempt with breakpoints it did go into PopulatedontCares and return successfully, but when I checked the database, the columns were still empty:
while (!rsDontCares->GetadoEOF ())
{
rsDontCares->Fields->GetItem(fldName0)->Value = xDontCare0;
rsDontCares->Update();
rsDontCares->MoveNext ();
}
I'd tried UpdateBatch as well...
Dont know if you can help....but thanks anyways...
Appreciate your help,
ns
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The 'sometimes' part of problem suggests that you're using uninitialized data somewhere or overwriting memory blocks. Try to simplify PopulateDontcare - what happens if you don't write anything to database? Does program still crash?
Also, check the value of 'temp' variable inside the loop - add another TRACE, for example.
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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For another operation (adding and filling one column)I use PopulateDontcares (BTW, it has to be the UPdate Batch function, and not update() in order for the routine to work). It adds a column and fills it with the values. That part works great!
I guess I'll go and look at my variables to see if any are at fault...and implement your sugestions.
Appreciate your help,
ns
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hi..
compiler has error when I add OPENFILENAME in my code .where is the wrong?
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yes..
(24)OPENFILENAME ofn;
EROORS:
20.cpp(24) : error C2065: 'OPENFILENAME' : undeclared identifier
20.cpp(24) : error C2146: syntax error : missing ';' before identifier 'ofn'
20.cpp(24) : error C2065: 'ofn' : undeclared identifier
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If you want to keep WIN32_LEAN_AND_MEAN, include commdlg.h.
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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no errors when I delete this
#define WIN32_LEAN_AND_MEA //in stdafx.h
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Does anyone done an implementation of Layered Service Provider for Windows Sockets 2? Unfortuantely the only sample i've got (from MJN) doesn't work and the documentation isn't very clear.
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(Using VC++ 6)
I need to obtain the full filename of a dll that is being instantiated as a COM interface.
I am aware of the "GetModuleFileName" procedure and the relevance of the first parameter: NULL gives you the calling exe file, right? Well, I still get the same filename if I use the Instance, so I must be doing something screwy?? I've resorted to hardcoding the dll filename as a constant at the moment, which gets me off the hook temporarily, but this approach won't work indefinitely, so any help is much appreciated.
Code snippet:
CWinApp* App = AfxGetApp ();<br />
HINSTANCE hInstance = App->m_hInstance;<br />
<br />
<br />
TCHAR cFileName[_MAX_PATH];<br />
GetModuleFileName (hInstance, cFileName, _MAX_PATH);<br />
Ta!
Debbie
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HINSTANCE stored in your app may refer to .exe. Try to store/use HINSTANCE passed to DllMain.
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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I did read about that in a google search. However (and I'm showing my ignorance here!) this is the first ever DLL I've created myself, and I generated it using the MFC dll wizard: I can't find that procedure *anywhere*! If someone could point me in the right direction it would be much appreciated.
Ta!
Debbie
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There's a function called DllMain in your .dll project. It's called by Windows during initialization of your .dll and gets the right HINSTANCE. You can store HINSTANCe somewhere or call GetModuleFileName right in DllMain.
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
char buf[1024];
GetModuleFileName(hInstance, buf, sizeof(buf));
...
}
To find DllMain, expand 'Globals' item in ClassView.
Tomasz Sowinski -- http://www.shooltz.com
*** Purgamentum init, exit purgamentum ***
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Hi,
Thanks for the advice. My orignal probelm appears to be sorted, (see other post), but I would like to understand a bit more about it.
My Globals don't contain a DllMain function (unless I need new glasses  , I did look, honest!).
It has 4 functions DLLCanUnloadNow; DLLGetClassObject; DllRegisterServer and DllUnregisterServer. This is a COM interface, maybe that makes a difference?
I'm afraid I'm very new to both DLLs and COM. It appears to be working (amazingly), but it's a bit like black magic atm. Maybe all will become clear in time. I do hope so!
Ta!
Debbie
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I still haven't found the DllMain method, but I have sussed out that I can access the _Module directly (having had a look at the DllGetClassObject method. This does seem to do the trick in giving me the right filename. I'm not exactly sure that I fully understand it, yet, though!
<br />
HINSTANCE hMine = _Module.m_hInst;<br />
GetModuleFileName (hMine, cFileName, _MAX_PATH);<br />
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hi,
I have a sizeable ListCtrl in a FromView.
The ListCtrl has a report style.
Additionally I want to size the column of the
ListCtrl when sizing.
But the scrollbars don't want what I want.
When the row count grows up and the horizontal
scrollbar is shown the vertical scrollbar
is shown, but it is not nessaray.
Second it is liable to run around. When the first
column width was changed the headerctrl
sends a WM_SIZE to the listctrl.
How can I avoid this.
<br />
MyFormView::OnSize(...)<br />
{<br />
m_ListCtrl.::MoveWindow(...,..., TRUE);<br />
}<br />
<br />
MyListCtrl::OnSize(UINT nType, int cx, int cy) <br />
{<br />
int iCol;<br />
int nCols =GetHeaderCtrl()->GetItemCount();<br />
int nWidth=0;<br />
RECT rect;<br />
float f;<br />
SCROLLINFO scrinfo={0};<br />
CHeaderCtrl* pHdr=GetHeaderCtrl();<br />
HDITEM hdi={0};<br />
<br />
CListCtrl::OnSize(nType, cx, cy);<br />
<br />
for(iCol=0;iCol<nCols;iCol++)<br />
{<br />
pHdr->GetItemRect(iCol,&rect);<br />
nWidth+=rect.right-rect.left;<br />
}<br />
<br />
GetScrollInfo(SB_VERT,&scrinfo);<br />
if(scrinfo.nPage<=scrinfo.nMax)<br />
{<br />
GetClientRect(&rect);<br />
cx=rect.right-GetSystemMetrics(SM_CXVSCROLL);<br />
}<br />
<br />
f=(float)(cx)/(float)(nWidth);<br />
<br />
<br />
hdi.mask=HDI_WIDTH;<br />
for(iCol=0;iCol<nCols;iCol++)<br />
{<br />
pHdr->GetItem(iCol,&hdi);<br />
hdi.cxy=f*hdi.cxy;<br />
pHdr->SetItem(iCol,&hdi);<br />
<br />
}<br />
}<br />
<br />
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