|
hi, all
I got debug assertion failure when the app hits \MFC\SRC\WINCORE.CPP, at function "void CWnd::AssertValid() const", line "ASSERT((CWnd*)p == this);"
#ifdef _DEBUG
void CWnd::AssertValid() const
{
if (m_hWnd == NULL)
return; // null (unattached) windows are valid
// check for special wnd??? values
ASSERT(HWND_TOP == NULL); // same as desktop
if (m_hWnd == HWND_BOTTOM)
ASSERT(this == &CWnd::wndBottom);
else if (m_hWnd == HWND_TOPMOST)
ASSERT(this == &CWnd::wndTopMost);
else if (m_hWnd == HWND_NOTOPMOST)
ASSERT(this == &CWnd::wndNoTopMost);
else
{
// should be a normal window
ASSERT(::IsWindow(m_hWnd));
// should also be in the permanent or temporary handle map
CHandleMap* pMap = afxMapHWND();
ASSERT(pMap != NULL);
CObject* p;
ASSERT((p = pMap->LookupPermanent(m_hWnd)) != NULL ||
(p = pMap->LookupTemporary(m_hWnd)) != NULL);
ASSERT((CWnd*)p == this);
the failure message comes up when p was point to "cWndhWnd" and this is "CUsoDlg".......since it's a multithread application, could this failed message just be ignored? it's debug assertion anyway.
thanks!
-- modified at 15:03 Tuesday 13th September, 2005
|
|
|
|
|
valerie99 wrote:
".......since it's a multithread, could this failed message just be ignored? it's debug assertion anyway.
Are you serious? When an assertion fires, it is indicating to you that something was encountered that was not expected and needs to be fixed. Just because you do not see it in Release mode does not mean that the problem does not exist.
At the point of the assertion, what does the stack trace look like?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
Thanks for your replay, David
I have checked the app again, seems like most of the time, both p and this will point to "CUsocDlg", which is correct. Somepoint, P will points to "CWndhWnd", I am not sure where is this from....
CObject* p;
ASSERT((p = pMap->LookupPermanent(m_hWnd)) != NULL ||
(p = pMap->LookupTemporary(m_hWnd)) != NULL);
ASSERT((CWnd*)p == this);
the stack trace looks like it's at the end of the void CUsocDlg::Process() (it points to last '}')......it also at UINT ThreadFalling(LPVOID pParam) function, line "return 0"
|
|
|
|
|
valerie99 wrote:
the stack trace looks like it's at the end of the void CUsocDlg::Process() (it points to last '}')......it also at UINT ThreadFalling(LPVOID pParam) function, line "return 0"
When you double-click on an item in the Call Stack window, you are taken to the line immediately preceeding that line. It will be marked with a yellow arrow in the left margin. In your case, if that arrow is pointing to the closing curly brace, the statement right above that is the active one. Go back through the functions called, the ones for which you have the source, and note the state and value of the variables. You should be able to tell if a variable does not look right before a function is called with bogus data.
Here is a very basic article on how to use the debugging windows:
http://www.perfectxml.com/nr/aspnetdebug.pdf
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
Hello Friends,
I have 3 edit boxes in which I enter the values of RGB respectively. Whenever there is a change of value in the edit boxes, I display the appropraite color based on the inputted values in a picture control.
My main problem lies, if I resize the window, then the color displayed in the picture control is gone, so for displaying it again, i have to change the value of edit box.
So, please help me regarding this one so that even if i resize the window, the colour is shown to the user.
Even I had included OnPaint() function and calling the color display, then it is flickering.
Please help me.  
Thanks in Advance.
|
|
|
|
|
Check for the WM_SIZE event (OnSize() function).
|
|
|
|
|
It sounds like you are just redrawing the control in a new color and not setting it to the new color. In orther words, you should be calling a function that changes the drawing color of the control so that when it is being repainted it uses the new color.
You should not need to define your own OnPaint() function to accomplish this.
The flickering is noramaly caused by the OnEraseBkgnd().
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
|
|
|
|
|
Hey,
can you please help me. I've created a CustomControl which draws a special table. No I want to implent a scroll-function. So I added the style WS_HSCROLL and handled the message. I'd use the ScrollWindow function. Now the table scrolls, but the "new area" is not filled correctly. There is the last column (before scrolled) smeared. Do I have to code a special OnDraw-function. I thought it is enough when I paint outside the client area and then scroll....
|
|
|
|
|
Hello everybody,
Im new in c++ and i have a problem because i have mfc program (client/server) where the client identidy the USB devices connected and i save this information in a txt file with this information:
{745A17A0-74D3-11D0-B6FE-00A0C90F57DA}
{483K23F8-74D3-11D0-B6FE-00A0C90F57DA}
and i want to know if this two usb devices are registered adn for this i use another text file in the server part whith all the usb registered that i want, for example:
{745A17A0-74D3-11D0-B6FE-00A0C90F57DA}
So if one usb is in the database i want to show a message that is registered. And i have this code but doesnt work, because dont show me the message:
void CIOCPClientDlg::compareFiles(){
char data[40];
std::ifstream fileusb ("GUIDs_found.txt");
char data2[40];
std::ifstream database ("C:\Documents and Settings\Densitet\My Documents\Visual Studio Projects\IOCP-SRC\IOCP-SRC\IOCP\Debug\USBDevices.txt");
bool salida =false;
while (!fileusb.eof() )
{
fileusb.getline(data,40);
while (!database.eof()&&(!salida==false))
{
database.getline(data2,40);
if (data==data2){
AfxMessageBox("USB registered");
}
salida=false;
}
}
}
If somebody can help me with this proble.
Than you for the possible help
|
|
|
|
|
Replace:
if (data==data2){
by that:
if (strcmp(data,data2) == 0){
What you are doing is comparing the two pointers which are of course different (the pointer data points to another location than the pointer data2).
|
|
|
|
|
Thank u for the help. I replaced that but i still can´t see the messagebox with USB registered so is any problem because i know that the information of the first file(data) is in the other file(data2), for sure. So i dont know what to do. Thank u.
|
|
|
|
|
densitet wrote:
std::ifstream database ("C:\Documents and Settings\Densitet\My Documents\Visual Studio Projects\IOCP-SRC\IOCP-SRC\IOCP\Debug\USBDevices.txt");
This won't work with single backslahes in a string literal.
Cedric has already given you a solution, but I have question. Since this is an MFC application, why are you using char instead of CString? By changing data and data2 to CString, you can then do the more natural if (data == data2) comparison.
Also, for each line that you are reading from the fileusb object, you are looking for that line in the database object. That works fine for the first pass through the database object but I don't see where that object gets reset so that it can be searched again for the next line in the fileusb object.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
ok i understand
so now i have this code:
char data[128];
std::ifstream fileusb ("GUIDs_found.txt");
char data2[128];
std::ifstream database ("C:\\USBDevices.txt");
bool salida2 =false;
while (!fileusb.eof() )
{
fileusb.getline(data,128);
database.getline(data2,128);
while (!database.eof()||(salida2!=true))
{
if (strcmp(data,data2) == 0){
salida2=true;
AfxMessageBox("USB registered");
break;
}
else{
fileusb.getline(data,128);
}
}
salida2=false;
}
fileusb.close();
database.close();
It is only a function that i added to my program, and it works for the first case but how i can reset fileusb because i want that it starts again to compare with all the lines that i have in the database, because when fileusb finish with all the lines comparing with the first element of database, databse changes to the second line, but fileusb doesnt reset.
Thank u for the help
|
|
|
|
|
Try the istream::seekg() method.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
dude I have no ideea why you complicate so much.
in a coule of line you couldcompre very huge txt files
CreateFile()
CreateFileMapping()
MapViewOfFile()
memcmp()
good luck
gabby
|
|
|
|
|
Which would not produce the desired result. Searching through one file for occurrences of strings contained in another file is not as simple as using memcmp() because the files are in no way guaranteed to be the same. They could be different sizes and could be ordered differently.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
if the file is small enough he could use
StrStrI(mapviewoffile1,mapviewoffile2)
otherwise:
if (size(f1)==size(f2))
while (!feof(f1)||!feof(f2))
{
if (fgetc(f1)!=fgetc(f2))
{
resemblance=FALSE;
break;
}
}
if(!resemblance)
{}
all this code in a thread.
gabby
|
|
|
|
|
Go back and read the initial post again. One text file will contain the USB devices for a particular machine. Another text file, the one stored on the server, will contain a much larger list of the registered USB devices to search through. There is no way you can reliably use StrStrI() or fgetc() for this type of comparison.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
Extactly, my fileusb can has 2, 3, 4 usb devices plugged. And my database can has maybe 10 usb devices registered. So im getting crazy because i dont know how to use correctly istream::seekg(); and where exctaly, i suposse when i find one usb registered then reset with this function fileusb and i start in the beginning again and i compare with the second od the dataserver??, so i only have to write this function and the rest is ok??.. Thank u very much for the help
void compareFiles(){
char data[40];
std::ifstream fileusb ("GUIDs_found.txt");
char data2[40];
std::ifstream database ("C:\\USBDevices.txt");
bool salida2 =false;
while (!fileusb.eof() )
{
fileusb.getline(data,40);
database.getline(data2,40);
while (!database.eof()||(salida2!=true))
{
if (strcmp(data,data2) == 0){
salida2=true;
//data[40]=0;
AfxMessageBox("USB registered");
break;
}
else{
fileusb.getline(data,128);
}
}
salida2=false;
}
fileusb.close();
database.close();
}
|
|
|
|
|
Sorry but with what parameters i do the seekg because im looking the msdn and i dont have nothing clear. 
|
|
|
|
|
look this:
CreateFile()
CreateFileMapping()
MapViewOfFile()
memcmp()
good luck
gabby
|
|
|
|
|
ifstream::seekg() works. If you are reseting to the beginning of the file, you can just close and open the file again.
Danny
|
|
|
|
|
Ok, now i have that, i have changed things that u told me, but now i think it is in a infinitive loop. Im new in c++ but a simple comparation to see if for example 2 elements from one file are in other file with 10 is difficult right now because i can't do a breakpoints to see where is the error. I dont know if u have any ideas for this code that i show here but the idea is that i described. thank u for all the help.
char data[128];
char data2[128];
bool salida2 = false;
ifstream fileusb;
ifstream database;
fileusb.open("GUIDs_found.txt", ios::in);
database.open("USBDevices.txt", ios::in);
fileusb.getline(data,128);
while (!fileusb.eof())
{
database.getline(data2,128);
while ((!database.eof())||(salida2!=true))
{
if (strcmp(data,data2) == 0){
salida2=true;
//database.clear();
database.seekg(0,ios::beg);
database.close();
database.open("USBDevices.txt", ios::in);
database.getline(data2,128);
fileusb.getline(data,128);
}
else{
database.getline(data,128);
}
}
salida2 = false;
}
fileusb.close();
database.close();
|
|
|
|
|
How about:
fileusb.getline(data, 128);
while (! fileusb.eof())
{
database.getline(data2, 128);
while (! database.eof() && salida2 != true)
{
if (strcmp(data, data2) == 0)
salida2 = true;
else
database.getline(data, 128);
}
database.seekg(0, ios::beg);
fileusb.getline(data, 128);
}
database.close();
fileusb.close();
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
|
|
|
|
|
Ok, think i solved that, but when i find the first elemente and i change for the second in the first file i see a messagebox without nothing and later i start again good and when for example the second element is founded in the file i can't show USB registered i only show nothing but with the first i see USB registered,Maybe is the buffer??
fileusb.open("GUIDs_found.txt", ios::in);
database.open("USBDevices.txt", ios::in);//
while (! fileusb.eof())
{
fileusb.getline(data, 500);
AfxMessageBox(data);
database.getline(data2, 500);
AfxMessageBox(data2);
while (! database.eof() )
{
if (strcmp(data, data2) == 0){
//salida2 = true;
AfxMessageBox("USB registered");
break;
}
else if (strcmp(data,data2) != 0){
database.getline(data2, 500);
AfxMessageBox("USB NOT registered");
AfxMessageBox(data2);
}
}
database.seekg(0, ios::beg);
fileusb.getline(data, 500);
AfxMessageBox(data);
}
database.close();
fileusb.close();
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
