|
Hi,
I am new to c++ and I will use it in my thesis on image processing.
I wrote a piece of code to read a ppm image file. in order to read the magic number (the number indicating the type of the image file whether it is ppm, bmp, jpeg or etc. this magic number is in the header section of the image) i create a char pointer magicNumber:
char *magicNumber;<br />
magicNumber = new char[2];
and pass it into the function PPMreadHeader. My intent is to fill the pointer inside the function and write the magicnumber in the console outside the function.
i have an array in the PPMreadHeader fuinction in order to read the file line by line. I have a local char pointer "word":
<br />
char line[255];<br />
char * word;
when i read the magicnumber (it is "P6" for ppm files) i assign it to the local pointer word:
word=line;
if i try to write the magic number in the function using the local pointer:
cout<<word<<endl;
there is no problem, it writes p6 to the console. however, if i first copy the word into the magicnumber pointer that i create in the main function:
*magicNumber=*word;<br />
*(magicNumber+1)=*(word+1);
and then try to print out the pointer to the consolelike below:
cout<<"magicNumber: "<<magicNumber<<endl;
then it writes:
magicNumber:P6ııııİİ
which not i want. it writes the p6 which is what i want to write to the console, but it writes more than p6. within the function when i write the local pointer "word" it just writes the P6, nothing more. Could you please help me on this.
You may advise other alternatives to write the magic number on to the console but even you do this, i still want to learn what is wrong with my coding. i spent a lot of time on this and i could not fix it.
Thank you in advance.
|
|
|
|
|
Did you read this post: The C++ / CLI is for managed and mixed-mode C++ programming only
you can find it on the top of first page of (Managed) C++/CLI.
This question shoud be in Visual C++ / MFC
|
|
|
|
|
I am using vs05
Thread ^thd = gcnew Thread(gcnew ThreadStart(CountTime));
error:
Error 1 error C3867: 'test::mainForm::CountTime': function call missing argument list; use '&test::mainForm::CountTime' to create a pointer to member c:\projects\test\mainForm.h 445
Error 2 error C3350: 'System::Threading::ThreadStart' : a delegate constructor expects 2 argument(s) c:\projects\test\mainForm.h 445
I can't find any correct info in help.
ps: I already checked Codeproject, but all articles are about VB.NET and C#
|
|
|
|
|
|
thanks it worked. One of my tries was exactly same expect it had CountTime(), but it shoud CountTime without ()
|
|
|
|
|
Read the error message, it's telling you what's wrong
use '&test::mainForm::CountTime' to create a pointer to member
|
|
|
|
|
I'm playing with this for first time. Anyhoot.. in the output its telling me that the leak occured in crtdbg.h instead of Test.h. Is this normal behavior?
<br />
#define _CRTDBG_MAP_ALLOC<br />
#include <stdlib.h><br />
#include <crtdbg.h><br />
<br />
#include "Test.h"
<br />
int main()<br />
{<br />
_CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );<br />
_CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDOUT );<br />
_CrtSetReportMode( _CRT_ERROR, _CRTDBG_MODE_FILE );<br />
_CrtSetReportFile( _CRT_ERROR, _CRTDBG_FILE_STDOUT );<br />
_CrtSetReportMode( _CRT_ASSERT, _CRTDBG_MODE_FILE );<br />
_CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDOUT );<br />
<br />
_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );<br />
<br />
<br />
<br />
<br />
<br />
_ASSERT(false);
<br />
int * leakyInt = new int;
<br />
Test test;
<br />
return 0;<br />
}<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
|
|
|
|
|
This is the C++/CLI forum. You should post your question in the MFC/Visual C++ forum to receiver your request answer.
"We make a living by what we get, we make a life by what we give." --Winston Churchill
|
|
|
|
|
What if you add this (in your Test.h)
#ifndef TEST
#define TEST
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
class Test
{
...
|
|
|
|
|
yep that works. had to include another header in main.cpp to get that DEBUG_NEW thing.
<br />
#ifdef _DEBUG<br />
#define _AFXDLL<br />
#include <afx.h><br />
#define new DEBUG_NEW<br />
#endif<br />
|
|
|
|
|
Hi guys,
I think I need some serious painkillers on this!
Short version:
Can anybody explain in details how to expose a C# WinForms Control as ActiveX control. Either via hosting it in a MFC ActiveX control or by implementing it completely in C# (implementing all interfaces, registration/unregistration stuff, events).
Perhaps somebody has a template project for this problem where I just can drop in my Windows Forms Control and is willing to share it with me and the others (sounds like XMas, I know).
Bloody details:
We have a large client application with lots of legacy code that implements an ActiveX container. So you can add e.g. GUI components by providing new ActiveX controls. Since we have almost year 2007 we want to develop new GUI components with Windows Forms instead of the existing MFC/OWL stuff (yes! OWL!  ). We recently migrated to Visual Studio 2005 (.NET 2.0).
As far as I can see there are 2 main approaches:
(Approach 1) Use of a MFC ActiveX control for hosting the Windows Forms control and use the new MFC 8.0 template classes CWinFormsDialog[^] or CWinFormsView[^] for adding the WinForms control to a CDialog/CView.
(Approach 2) Implement all necessary COM interfaces completely in C# and make them visible to COM and do the extra COM registration/unregistration stuff as explained here[^]. So the resulting component would be completely written in C# with no other languages involved. Furthermore we have about half a dozen COM interfaces for communication between the client and the ActiveX component. These interfaces must be implemented too. Sounds like very much more work than approach one.
So we decided to follow approach one - hosting a WinForms control within a MFC ActiveX control. What a pain until now!
This is what we did (following the MSDN examples[^]):
(1) Created an "empty" MFC ActiveX control, with all of our COM interfaces, showing an empty CDialog. Works flawlessly when added to the client application or to the ActiveX Control Test Container.
(2) Enabled Common Language Runtime Support (/clr) for the project. After fixing some compiler warnings the project compiles fine to MSIL.
( #1) Here is already the first major problem: When the project is started after '/clr' is activated, Visual Studio 2005 locks up completely while loading the CLR DLLs (e.g. 'mscoree.dll', 'mscorwks.dll'). There is no error message or crash, but VS2005 hangs infinitely and the only thing to do is killing the 'devenv.exe' process. Why is this?  But it's possible to start the application regularly! Only when started via VS2005 it hangs. The ActiveX still shows up correctly when the application is not launched via VS2005.
(3) Since I found no solution for this problem I sighed and added a CWinFormsControl member to the "empty" CDialog as described in the MSDN example here[^] (which works by the way perfectly when used in a stand alone dialog application). I tried two variants:
CWinFormsControl<WinFormsCtrl::UserControl1> m_WinFormsCtrl;
CWinFormsControl<System::Windows::Forms::LinkLabel> m_WinFormsCtrl; The result was the same in both cases:
( #2) When the ActiveX is about to be displayed it crashes in 'CWinFormsControl<TManagedControl>::InternalCreateManagedControl' (<VS2005-install-path>\vc\atlmfc\include\afxwinforms.inl). Output window says: A first chance exception of type 'System.AccessViolationException' occurred in <MyActiveX>.OCX
I got this information by attaching to the application process with VS2005 when the application is already running.
I read several threads where members of the Visual Studio Team and MVP's are saying that MFC 7.1/8.0 are officially supported unmanaged hosts for Windows Forms controls, just like Internet Explorer. But it seems not to apply for MFC ActiveX controls!?
cheers,
mykel
If they give you lined paper, write the other way!
|
|
|
|
|
C'mon... doesn't anybody have experience with hosting WinForms controls inside MFC ActiveX controls?
There must be lots of large "legacy" applications out there which implement an ActiveX container for (GUI) extensions.
Any help is appreciated, even comments like "Careful, you'll likely get burned using this approach, because ..." 
cheers,
mykel
If they give you lined paper, write the other way!
|
|
|
|
|
I woud like an example to override,
ListView::set_DoubleBuffered() (Currently is Protected)
Thanks in advance
ps: I had already look on CP, but found nothing.
|
|
|
|
|
This is how you override a property:
ref class MyListView : ListView
{
public:
protected:
virtual property bool DoubleBuffered
{
bool get () override
{
return ListView::DoubleBuffered;
}
void set (bool value) override
{
ListView::DoubleBuffered = value;
}
}
private:
};
"We make a living by what we get, we make a life by what we give." --Winston Churchill
|
|
|
|
|
|
How can i limit my app to one instance?
|
|
|
|
|
Search for "single instance" or "one instance" on this site. You will get lots of results.
|
|
|
|
|
Thanks, Found with mutex method.
ps: I did search, but with wrong keywords
|
|
|
|
|
hi,
i would like to hide(or rather, to have the form disappear) after a new form has been created after clicking on "new" in the menustrip.
please help! 
my codes thus far:
private: System::Void newToolStripMenuItem_Click(System::Object^ sender, System::EventArgs^ e)
{
Form1^ newForm = gcnew Form1();
newForm->ShowDialog();
|
|
|
|
|
mactick wrote: i would like to hide(or rather, to have the form disappear) after a new form has been created after clicking on "new" in the menustrip.
Prety easy:
mactick wrote: Form1^ newForm = gcnew Form1();
this->Visible = false; // Hide current form
newForm->ShowDialog();
this->Visible = true; // show current form
|
|
|
|
|
if i wish to close the old form instead of hiding it after a new one has been created, how do i do that? 
|
|
|
|
|
Form1^ newForm = gcnew Form1();
newForm->Show(); //ShowDialog is opening modal window, It won't contiune execution Unless it isn't modal.
this->Close();
|
|
|
|
|
|
Hi all,
I have a form called: Form1 (Form1.h) and another form called: add_key_Value (add_key_Value.h)
Now I want to show the form add_key_Value:
So I include the header file add_key_Value.h in the Form1.h
And perform the following code:
add_Key_Value^ form2 = gcnew add_key_Value;
form2->Show();
Now in the add_key_value form I want to access the members of Form1:
So I include the header file Form1.h in the add_key_Value.h
And perform the following code: (ERRORS)
Form1^ mainform = gcnew Form1;
mainform->edtTextBox->Text = "Just testing";
Errors:
Error 3 error C2065: 'Form1' : undeclared identifier c:\documents and settings\qx55246\my documents\visual studio 2005\projects\cnfedtctrl\cnfedtctrl\add_key_Value.h 231
Error 4 error C2065: 'mainform' : undeclared identifier c:\documents and settings\qx55246\my documents\visual studio 2005\projects\cnfedtctrl\cnfedtctrl\add_key_Value.h 231
Error 6 error C2227: left of '->edtTextBox' must point to class/struct/union/generic type c:\documents and settings\qx55246\my documents\visual studio 2005\projects\cnfedtctrl\cnfedtctrl\add_key_Value.h 232
Can anyone please help ???
Many Thanx
The only programmers that are better than C programmers are those who code in 1's and 0's.....
Programm3r
|
|
|
|
|
You have a circular reference of header files
Form1.h includes add_key_value.h which includes Form1.h which includes add_key_value.h etc etc etc
Split your implementation into .h and .cpp files and use a forward declaration so you can use typename^ in the header file
Form1.h
#include "add_key_value.h"
...
add_Key_Value^ form2 = gcnew add_key_Value(this);
form2->Show();
add_key_value.h
class Form1;
public ref class add_key_value.....
{
public:
add_key_value(Form1^ mainForm);
private:
Form1^ mainForm;
}
add_key_value.cpp
#include "Form1.h"
add_key_value::add_key_value(Form1 ^ mainForm)
{
this.mainForm = mainForm;
}
System.IO.Path.IsPathRooted() does not behave as I would expect
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
