|
abrakadbra wrote: Does anyone know where I can get a tutorial of how to connect to database and manipulate with data?
I show how to do that here.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
|
|
|
|
|
I keep getting this error from the compiler which I'm trying to decipher (if it even is an error), that pops up and misteriously disappears with no realation to the changes I've made to the code.
ReflectRefract virtual void * __thiscall std::length_error::`vector deleting destructor'(unsigned int)" (??_Elength_error@std@@UAEPAXI@Z) from CChildWndArranger.obj
Replaced symbol(s):
"public: virtual void * __thiscall std::logic_error::`scalar deleting destructor'(unsigned int)" (??_Glogic_error@std@@UAEPAXI@Z) from CChildWnd.obj
"public: virtual void * __thiscall std::out_of_range::`scalar deleting destructor'(unsigned int)" (??_Gout_of_range@std@@UAEPAXI@Z) from CChildWnd.obj
and this other error
ReflectRefract virtual __thiscall std::length_error::~length_error(void)" (??1length_error@std@@UAE@XZ) from CChildWndArranger.obj
Replaced symbol(s):
"public: virtual __thiscall std::logic_error::~logic_error(void)" (??1logic_error@std@@UAE@XZ) from CChildWnd.obj
"public: virtual __thiscall std::out_of_range::~out_of_range(void)" (??1out_of_range@std@@UAE@XZ) from CChildWnd.obj
I'm using VS .NET 2002 sp1. Help would be greatly appreciated.
|
|
|
|
|
Can you show code, probably causing this error?
|
|
|
|
|
I am working on an MFC application (Visual Studio/C++) that has to grab a screen shot from a frame grabber and send it to the default printer with landscape orientation. This has to be done with no operator intervention other than clicking on a "Print" button in the main dialog - no preview or print dialog. I'm able to grab the frame, but I'm having no success with the printing.
Any help would be greatly appreciated.
Bob.
|
|
|
|
|
How to send and what happen when you send?
|
|
|
|
|
CPrintDialog dlg(FALSE);
dlg.GetDefaults();
If the call returns non-zero, will have filled in everything, including a printer DC. You can then use this to do your printing, although if you want landscape, you will need to alter the DEVMODE stuff to suit.
Steve S
Developer for hire
|
|
|
|
|
Thanks for the suggestions.... I think I should have worded my original question a little better though.
What I have is not a "bitmap" in the MFC sense, but a pointer to a big bunch of pixels. I can't seem to figure out how to get these in a form that can be printed - what comes out on the printer is just a black rectangle.
Thanks in advance...
Bob.
|
|
|
|
|
I have completed this dialog window reading in filenames and a progress bar to indicate progress. A timer is used to update the progress bar.
However, when I called a C procedure that is computationally intensive, all the edit boxes and menu went blank. The worst thing was that the progress bar was not incrementing. Do take note that the program is running fine except for these side effects. The processed output was tested to be correct.
Before I include the C procedure, testing was done to make sure the dialog windows work well with the progress bar etc.
Please advise if the computationally intensive C procedure resulted in this issue. If yes, how do I overcome it.
searcher08
|
|
|
|
|
Your app needs to be multithreaded, so the UI updates while your code is taking up lots of CPU. Otherwise, the paint messages are not handled, and your window is not drawn.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
|
|
|
|
|
Can I look your code! May be I can make it better! and then sent it to you.
---++Xu Shanghua
|
|
|
|
|
You send a thread to Mr Christian Graus  you can answer directly to sender question
|
|
|
|
|
I have not done multi-threading before but looking at the reference books and online tutorial, they are all related to classes or objects. I am only calling a C procedure with a parameter in it.
The function needs to be in this form. Do I have to convert my C-procedure to this format? Mine is of the format void decode(char *).
UINT MyThreadProc( LPVOID pParam ) // taken from MSDN
{
CMyObject* pObject = (CMyObject*)pParam;
if (pObject == NULL ||
!pObject->IsKindOf(RUNTIME_CLASS(CMyObject)))
return 1; // if pObject is not valid
// do something with 'pObject'
return 0; // thread completed successfully
}
Next will be to begin the thread:
pNewObject = new CMyObject;
AfxBeginThread(MyThreadProc, pNewObject);
Where do I put my C-procedure in the above code?
How do I know that the thread has ended?
Thank you.
searcher08
|
|
|
|
|
Any function that starts with Afx is part of MFC. You can write threaded code without using MFC, and therefore without this format.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
|
|
|
|
|
Calling a function like this periodically (but not too often) during your computations should help:
<br />
int DoMessagePump()<br />
{<br />
BOOL bCompleteFlag=FALSE;<br />
MSG msg;<br />
BOOL bDoingBackgroundProcessing=TRUE;<br />
<br />
Sleep(1);<br />
<br />
while (::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {<br />
if (msg.message == WM_QUIT) {<br />
bDoingBackgroundProcessing=FALSE;<br />
::PostQuitMessage(0);<br />
break;<br />
}<br />
<br />
if (!AfxGetApp()->PreTranslateMessage(&msg)) {<br />
::TranslateMessage(&msg);<br />
::DispatchMessage(&msg);<br />
}<br />
}<br />
<br />
AfxGetApp()->OnIdle(0);
AfxGetApp()->OnIdle(1);
<br />
if (bDoingBackgroundProcessing == FALSE) return -1;<br />
if (bCompleteFlag == TRUE) return -1;<br />
<br />
return 0;<br />
}<br />
This code implements basic message passing (the Windows GUI is based on a cooperative multitasking approach, so your code has to "cooperate" LOL).
Christian is of course correct - The best way to do this is put your code into a different thread, but that sometimes adds a layer of complexity you don't always need.
Beware the calls to AfxGetApp()->OnIdle() - MFC needs this to "breathe" but it can result in lots of overhead in your computation. The more often you call DoMessagePump() the better the GUI response will be, but the longer your computation will take.
|
|
|
|
|
I would like to use your method instead of creating another thread. However, the computation procedures are in C and not in C++. I am afraid that the above function may not work in the C code as they are all in MFC. I am calling an extern C procedure from a C++ GUI code.
Thanks.
searcher08
|
|
|
|
|
can someone describe the simplest way to monitor a program, and whenever a function such as loadlibrary is called, have my program show a messagebox (or do something)
|
|
|
|
|
Do you need to see what files use in a program?
|
|
|
|
|
I'm trying to add more text to a field in a binary file, but I can't manage to make it work. I was hoping someone could point me to a tutorial on how to do this or give me tips, because I really can't find any infos on this.
|
|
|
|
|
It is impossible to append data to the middle of a file. The workaround however is to create a new file, write the data from the start of the old file to the point you want to append the data into the new file, write the new data into the new file, and then write the rest of the old file into the new file. Then delete the old file and rename the new file with the old file's file name.
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good, use it!!!
|
|
|
|
|
That's what i tought, but how can I write the binary data to the new file without having the value of each field(what i mean is rewriting the hex value directly instead of writing the value of a string or an integer). I hope you understand what i'm saying here.
|
|
|
|
|
You need to read the entire file into memory and manipulate it there. Then you have all the values. You can store the file as a BYTE array, that seems to be what you're after.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
|
|
|
|
|
Could you give me an example of how you do this. I tried to write it byte by byte, but i never get the same result as the original file. And is it possible using CFile.
|
|
|
|
|
What are you trying ? I'm sure CFile can do it, but I have no idea how, I don't use it, ever. I use standard C++ where-ever possible ( so, I use fstreams )
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
|
|
|
|
|
I think maybe i know why it never worked, I never managed to put it in a byte, only an unsigned char. What should i do to put it in a byte directly?
Also, I used CFile only because i never managed to copy japanese correctly with fstreams.
|
|
|
|
|
samkook wrote: What should i do to put it in a byte directly?
BYTE is a typedef for unsigned char, so, makes no difference.
samkook wrote: Also, I used CFile only because i never managed to copy japanese correctly with fstreams.
OK, well, sounds like you weren't using fstream properly either. A stream should not care if the bytes are japanese text, or a picture of the pope.
I think you need to post code, and wait for someone who uses CFile to step in.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
