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I was trying in this example only. There is a open function in this example
which opens the connection
m_sSql.Format("SELECT * FROM [%s$A1:IV65536]", m_sSheetName);
try
{
m_rSheet->Open(CRecordset::forwardOnly, m_sSql, CRecordset::readOnly);
}
here in try block it passes m_sSql (sql command).
when i pass NULL instead of sql command it gives abort error.
Acutally i m trying to read my excel sheet without using sql command...
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neha.agarwal27 wrote: ...give abort error dbcore.cpp.
Are you referring to an assertion?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi there !!
I would like to seek some help to understand if there are direct Windows API (C++) to create a zip file from multiple files.
I have a set of files which i want to package into one zip file programmatically.
Please let me know what is the best possible way to to get this done.
Thanks and Regards,
Jai Praful Ved
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As far as I know there is no windows API support for handling ZIP files.
Windows just supports cab files.
I you want to process zip files from c++ you should zlib which is free.
Just google for "zlib" or see
<http: en.wikipedia.org="" wiki="" zlib="">
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Will I be able to use zlib library to make a package out of a number of files into one zip file ?
Let me give you some details. I have a set of files and folders with data. I want to programmatically package these files and folders into a single zip file. The zlib works for buffers and I have a set of files and folders to work with......
Please guide me !!
Regards,
Jai Praful Ved
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Hello,
I have derived a class from CWnd to make a dialog box.I was not able to derive a class from CDialog since it needed a dialog resource ID which I don't have.So I derived a class from CWnd .
But how do I make the window behave like a dialog where the user will not be able to activate any other window before closing this window(dialog).
Thanks
Prithaa
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If you need Dialog behaviour, it will be better if you derive from CDialog. The ID is automatically set by the assistant if you are using it, but you can set it dinamically too. Take a look to the function (VC++ 6 help quote)
CDialog::CreateIndirect ():
Creates a modeless dialog box from a dialog-box template in memory (not resource-based).
CDialog::InitModalIndirect ():
Creates a modal dialog box from a dialog-box template in memory (not resource-based). The parameters are stored until the function DoModal is called.
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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Thanks Nelek
So do you mean that I can derive a class from CDialog without any resource template and call the function InitModalIndirect().But this function requires lpDialogTemplate, so I should make that structure and add the windows
controls as I want them in the class.
Will it be that simple?
Pritha
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It should, but I can not say it will  :P
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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Thanks Nelek
I will try that.
Prithaa
Bye
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Just one thing more, as well you should try to write new messages with new questions... if it is something related with this... please tell me here about the new message, I will have a email if something is added to this post. It is to avoid not reading a message related 
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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Hi, I recently posted an article (http://www.codeproject.com/useritems/VC2003MeyersSingletonBug.asp) and one of the comments raised a question that I cannot find a definitive answer for. I'm hoping somebody can help here. The question is:
In C++, if an inline class member function that contains a local static variable is included in a header which is included in more than one CPP file, does the linker garuantee that the static variable is treated as a single instance?
So in foo.h:
class foo
{
public:
int bar()
{
static int i = 0;
++i;
return i;
}
};
And in fooA.cpp:
#include "foo.h"
extern void fooB();
int main()
{
foo f;
printf ( "%i", f.bar());
fooB();
return 0;
};
And in fooB.cpp:
#include "foo.h"
void fooB()
{
foo f;
printf ( "%i", f.bar());
};
Should I get the output:
12
Or:
11
BTW, I know what actually happens in my similar real code - I get "12" which is what I expect. But I'd like to know if this is C++ standard behaviour, undefined in the standard or just an MS compiler quirk. Thanks for reading.
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I can't speak to the standard but the MS compiler simply ignores the inlineness of the function. In fact is never 'gaurentees' to inline anything even if you __declspec(inline) or __forceinline. This may be one of the reasons.
Nothing is exactly what it seems but everything with seems can be unpicked.
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FWIW, GCC seems to behave the way I expect (links the static as a single global instance) as well (also with optimisations enabled).
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Hi,
I'm using one COM component(exe), which implements the connection points also.
I have a client which implements Sink interface . The event the server fires is a method with a single argument BSTR. When the server fires the event, client gets the notification, but the BSTR value is invalid(empty string).
The problem is also seen with ULONG parameter also(where the value is garbage). Please suggest a solution, and please suggest if it is a good idea to have parameters in the event notifications.
Also if two clients are connected to the server, only the client which caused the event to be fired is getting the notification.
Thanks and regards,
Raja Pratap.
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It's a little while since I did any COM connection points but if your data isn't getting through then I guess it's a marshalling issue. Check you Proxy/Stub implementation. Parameters in the event notifications should definitely work.
The Server end needs a loop to notify all the clients for each event. Most of the samples leave this out as they simplify to one client.
5 years ago I had to implement reverse connection points with no documentation so I remember how painful this can be.;)
Nothing is exactly what it seems but everything with seems can be unpicked.
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hi can anyone tell me any article for creating setup project(msu installaer file creation) in visual studio 2005. pls help me
Arise Awake Stop Not Till ur Goal is Reached.
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that page not found. my problem is i am creating a msi package. when i install this the path where the package installed should be added in registry
Arise Awake Stop Not Till ur Goal is Reached.
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Hi,
I am new to windows programming. In my code I would require to change the slider bar position (I am actually invoking the sliderbar from UI using win32 API, so I donot have source code of the application), which I have accomplished by sending message.
::SendMessage( aControlHWnd, TBM_SETPOS, (WPARAM) (BOOL) TRUE, (LPARAM)(LONG) aPosition );
The problem is with the updation of the window according to the new sliderbar position, I mean, when I change the position of the sliderbar it is changed visually, but the corresponding values in other objects (like textbox showing the value related to this sliderbar) are not updated.
To accomplish this I tried
::NotifyWinEvent( EVENT_OBJECT_VALUECHANGE, theDialogHWnd, OBJID_HSCROLL, CHILDID_SELF );
where theDialogHWnd is the handle for the dialog window containing the sliderbar and the textbox, but it didn't work. I am not sure if the parameters I am using are correct, or the event I am trying to notify, or may be my approach to the problem itself is wrong. I do understand that this can be easily accomplished by sending a keyboard or mouse event, but I am tryin not to use it.
Any help would be greatly appriciated.
Thanks.
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When slider bars are moved they post either a WM_HSCROLL or a WM_VSCROLL to its parent. Try posting these messages to the parent window of the slider bar. To determine which message should be sent check the slider control for the style TBS_VERT.
See if something like this works:
int iPos = m_slider->GetPos();
if (m_slider->GetStyle() & TBS_VERT)
pWnd->PostMessage(WM_VSCROLL, (WPARAM)((iPos << 16) | SB_THUMBPOSITION), (LPARAM)NULL);
else
pWnd->PostMessage(WM_HSCROLL, (WPARAM)((iPos << 16) | SB_THUMBPOSITION), (LPARAM)NULL);
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I want to know how can i make Intelliegnt Connectors,like those in MS Visio that connect 2 or more blocks and when the blocks are moved, the connectors position themselves accordingly without interferring with any other block.
Is it possible to make such connectors using VC++? I need this as i have to do a the same for my project.
Pls help
Regards
Meenu
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Hi, it can be possible, but it will be difficult.
I would make it by setting the points where you can connect the object in an array/structure, then use some regions to know if the mouse is approaching to one of them to make the point visible when necessary and using its coordinates by clicking when it is visible.
Afterwards for the lines... this will be pretty hard (I think), at the beggining you should determine which point of your object is being used to start the line. Make a short line in this direction (if the point is at the top then a short line to north, if the point is at left, then a short line to west, and so on...). Then give priorities in directions (I mean go to the north if the object is in the lower part of the screen, go to the right if the object is on the left...). Once you have the beggining of the line, you should have a register of positions for the lines from left to right, from top to bottom (like a screen grid) and go through checking where is the next free place to draw the connection.
I can not give you any code, but the idea may be like that.
Shortly: Have a matrix to save the position of gridlines of the workspace, check where the connector is starting and go through taking dinamically the first free gridline you find towards the end of the connector. (if end is below, going down, if end is above, going up and so on)
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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