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i want to get a ftp client written in "socket api" for c or c++ ,not mfc CSocket and not wininet.
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http://www.freebsd.org/
http://www.openbsd.org/
http://www.netbsd.org/
All include a free ftp client writen in C, and all include source code. Check them all out. They all started from the same code at one time, so where you see differences see if you can figure out why. (Openbsd in particular tends to make changes to prevent problems that can't happen)
www.kde.org has a ftp client in C++, but it is perhaps too complex. (it intigrates into the rest of KDE nicely, but it is written to their ioslave spec so it may not be easy to under stand) GPL, which might be a problem for you.
I'm sure there are others. Have you searched sourceforge.net? Writing an ftp client used to be a common activity for students.
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hi,
i need to insert bitmap into a button control.plz help me.
Thankyou.
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If you are using MFC, use the MFC class CBitmapButton class
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See if this article helps.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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Hi,
I am working on a project for adding new entries to the Outlook Express( not Microsoft Outlook ) contacts. I came across a sample in CodeProject that does that but I want to do it without displaying any dialog box. Any sample code or tutorial on this will be very useful.
Thanks in advance
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1. Why is name mangling required ? (just to support overloaded functions only ? In that case will only overloaded function names are mangled ?)
2. If i use " __declspec( dllexport )", then do i still need .DEF file ?
3. If i have a dll with .DEF file, then should i distribute it with my dll so that client can use my dll?
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1. I don't know
2. Simple answer: use both. Writing the DEF file is a simple task, and using both ensures that using GetProcAddress works at all times. As I recall, there are some problems related to using either the first or the latter, but these problems were remedied by using both at the same time. It was related to the exported symbol ordinals in some way..
3. No. It is enough to give a documentation that describes the exported functions/symbols/classes of your DLL. This can be a plain text file.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Thanks and appreciation for your honest reply.![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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xcavin wrote:
1. Why is name mangling required ? (just to support overloaded functions only ? In that case will only overloaded function names are mangled ?)
By mangling, or decorating, the exported functions, C linkers can support class/namespace scope and function overloading, by turning what would be invalid redefinition of the same name into a new definition of a unique name. The C++ language allows function overloading where functions with the same name are only distinguished from one another by the data types of the arguments to the functions. Name decoration enables the linker to distinguish between different versions of overloaded functions because the names of the functions are decorated differently.
xcavin wrote:
2. If i use " __declspec( dllexport )", then do i still need .DEF file ?
With the proper .DEF file EXPORTS section, __declspec(dllexport) is not required. __declspec(dllexport) was added to provide an easy way to export functions from an .EXE or .DLL without using a .DEF file.
Per MSDN:
There are three methods for exporting a definition, listed in recommended order of use:
The __declspec(dllexport) keyword in the source code
An EXPORTS statement in a .DEF file
An /EXPORT specification in a LINK command
All three methods can be used in the same program.
xcavin wrote:
3. If i have a dll with .DEF file, then should i distribute it with my dll so that client can use my dll?
No, it is not required. The .DEF file is used solely by the linker.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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i see it wrapped around strings all the time.
yet i cant determine what exactly it suposed to do.
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It's a C macro that expands to: L"Some String" in a unicode build and "Some String" in a non-unicode build.
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I drawed two rectangles in gdi and gdi+ respectively ,which I usded the same Points.However,rectangles showed on the screen were not in the same place.what cause that??
The codes I used were as followed:
(How to initialize the gdi+ in vc++6.0,please reference the articles "Macro to initialize GDI+ in VC6.0 MFC projects [^]"By PJ Arends )
=================================
CxxView::OnInitialUpdate()
{
CSize sizeTotal;
sizeTotal.cx = sizeTotal.cy = 500000000;
//the mapping mode is MM_HIMETRIC
SetScrollSizes(MM_HIMETRIC, sizeTotal);
}
CxxView::OnDraw(CDC* pDC)
{
int nRadius = 1000;
CPoint ptCenter = CPoint(200000,0);
CxxDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
//Set the map mode of MM_HIMETRIC
pDC->SetMapMode(MM_HIMETRIC);
//Set the original of window ,so we can see the graphics on the screen
pDC->SetWindowOrg(CPoint(ptCenter.x-2*nRadius,ptCenter.y+2*nRadius));
Graphics graphics(pDC->m_hDC);
// Create a Pen object.
Pen pen(Color(255,0 , 255, 0));
Rect rectgdiplus = Rect(ptCenter.x-nRadius,ptCenter.y-nRadius,2*nRadius,2*nRadius);
//draw rectangle using gdi+
graphics.DrawRectangle(&pen,rectgdiplus);
CRect rect(ptCenter.x-nRadius,ptCenter.y-nRadius
,ptCenter.x+nRadius,ptCenter.y+nRadius);
CPen penNew,*ppenOld;
penNew.CreatePen(PS_SOLID,1,RGB(255,0,0));
pDC->SelectStockObject(NULL_BRUSH);
ppenOld=pDC->SelectObject(&penNew);
//draw another rectangle using gdi
pDC->Rectangle(&rect);
pDC->SelectObject(ppenOld);
TRACE("%d,%d,%d,%d\n",rectgdiplus.GetTop(),rectgdiplus.GetLeft(),rectgdiplus.GetBottom(),rectgdiplus.GetRight());
TRACE("%d,%d,%d,%d\n",rect.top,rect.left,rect.bottom,rect.right);
}
Thanks.
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Hello,
Does anyone know if it is possible for my application to monitor port 110 traffic? That is, is it possible to know when a resident mail client has sent a request to 110? I don't want a proxy but I need my program to take some actions if a user has requested a mail download.
It would be nice to know if messages are in fact coming in from such a request, but this is not absolutely necessary.
Thanks,
Murrah Boswell
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In my MFC application (VC6 C++) I maintain multiple
view's. I have a split view and multiple
tabbed views (only one tab view visable at a time)
Two separate view classes derived from CScrollView
in a single document interface.
I have implimented scrolling that works very well in
both view classes. When I switch the focus from one
veiw to the other, the scroll bars snap to zero in the
view that has lost focus.
I have implimented a post problem workaround that repositions
the scroll slider. But the scroll bars flash as they
display the zero setting, then are repositioned back to the
users setting.
Hopefully someone will give me an idea where to look to
stop the zeroing of the scroll bars. (A pre rather
than post solution.)
WedgeSoft
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One way to try to track this problem is to have one, and only one, function calling SetScrollPos in each view. Add some dummy code checking for a zero value, something like
...SetScrollbarPositions...
{
if( newpos == 0 )
{
int a = 0;
}
Run your application. Scroll one of the views. Switch to the debugger. Set a breakpoint at int a = 0. Switch to the app. Do the stuff that resets the scrollbar. Check the callstack in the debugger to see where it was called from. Problem most likely solved 
The slightly clumsy addition of extra code is to avoid (perhaps) a billion legal breaks before the problematic action.
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I have a problem on how to link a CDialog with CLsitView in SDI application in mfc appwizard[exe] because I cannot use a DoModal function to link those pages.
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Create the CDialog as a modeless child of the CListView then.
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i wanna put a pic as my chat window background its in my resource
plz help
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Ehh ?
What chat window ? Are you creating a chat program that has a received/sent text window, and you want to place a picture into the background ?
In that case, create a CBitmap variable, use CBitmap::LoadBitmap to load the bitmap from the resource. Then, during the WM_PAINT message of your window, use bitmap blitting (CDC:BitBlt) to display the bitmap.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Hi, I've got this problem when developing my first DLL:
I have a DLL with an Interface class. I also have an application that calls some functions from the Interface class.
In the application there exist a function that I want to be called from the DLL (as a callback), so I pass a function pointer to the DLL.
I want to store the function pointer inside the DLL so I can call the function whenever I want, for this reason I have created an struct in which I store the function pointer and some other things. Until here, everything fine...
The problem comes when doing an instance of the struct; if I do that instance inside the Interface class (as a member) I cannot copy the function pointer in it; but if I do the instance outside any class (that is as "global") then there is no problem when copying the functon pointer.
Does anybody knows why can this happen?, it can be a problem of memory access?
Here is a "meta-language" example:
DLL:
In Interface.h:
typedef struct
{
functionpointer
}MyStruct;
class Interface
{
Interface ();
MyStruct mystruct;
void FillStruct (function_pointer_from_outside); //this is the exported function
}
In Interface.cpp
void Interface::FillStruct(function_pointer_from_outside)
{
mystruct.functionpointer = function_pointer_from_outside; //THIS GIVES EXECUTION PROBLEM
}
On the other hand if I make something like this, it works:
In Interface.h:
typedef struct
{
functionpointer
}MyStruct;
class Interface
{
Interface ();
void FillStruct (function_pointer_from_outside);
}
In Interface.cpp
MyStruct mystruct; //Instance as "global"!!!!!
void Interface::FillStruct(function_pointer_from_outside)
{
mystruct.functionpointer = function_pointer_from_outside; //OK!!!
}
HELP!!
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My first question would be, what is the error during execution ? A run-time error ? An exception ? An access violation ?
Finding out the error type is integral to determining what the cause of the error is. I believe it to be an access violation, though. As a suggestion, you should try defining the function pointer as a standard pointer-to-function type. You shouldn't encapsulate it into a struct (what is the reason behind this, by the way ?)
Another working way could be to call GetModuleHandle on the main application. This returns a handle to the executable used to start the process. In english, it is the starting address of your main application. Now, if you pass this module handle into the DLL, you can use GetProcAddress inside the DLL code to query for the address of the function in the main module. This is something of a reverse-usage of the most common case: querying for a function address inside a DLL. Instead, we query for a function address inside the main application.
The returned value can then be used to invoke the function in the main application module. Using GetProcAddress ensures that the memory location pointed to by the returned pointer is ensured to contain information of to what module's memory area it points to. This may not be the case if you just pass the pointer using address-of operator.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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It is an exception error; a windows called "Just-In-Time Debugging" appear saying:
"An exception 'System.NullReferenceException' has occurred in testUI.exe".
Here is the definition of the pointer in the application (testUI.exe); as you can see, it is a pointer to a member function:
typedef void (CListener::*ListPtr)();
ListPtr pListPtr = new ListPtr;
pListPtr = &CListener::MyFunction;
I use a struct in the DLL because I want to store the pointer to the function, the pointer to the CListener class created in the textUI.exe, and an integer that acts as an identifier. Furthermore, I want to create an array of this struct, because I want the DLL to be capable to work with more that one textUI.exe at the same time (each one of them has its own version of "MyFunction"), and I want to store independently a reference to every function of each CListener object of each textUI.exe.
Thanks for your help
Irene
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Humm..
It seems here that each textUI.exe executable creates a new object of the CListener class ? Is this correct ?
So, could there be a reason why you wouldn't just pass around a pointer to the object itself ? Like, the executable that loads the DLL provides a function that will return the address of the local CListener object ? If the DLL is aware of the declaration of CListener, you can use the returned address as a standard pointer-to-class to call the member functions.
This way, you wouldn't need a pointer to the member function, but would have a pointer to the entire class. The pointer's size wouldn't change much, so the memory requirements would be held in check.
Naturally, this approach would place more strict design issues on the DLL code, especially if different functions of the class need to be called at different times. Perhaps you should increase the struct so that in addition to the pointer and the reference number, it would contain a flag that specifies the function to call ?
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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