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Yes, as other have just suggested you may cast your int and string to wparam and lparam repectively.
But what are you going to do if you will need to pass more data than do not fit in two variables later? I'd suggest to declare a struct, that would contain any information you need to pass with a message. This has one long tern advantage - if the code to be tweaked sometime later, tweaking will not affect function signatures and the app's architecture.
<br />
struct MYMESSAGEDATA<br />
{<br />
int nInteger;<br />
char* nString;<br />
};<br />
<br />
...<br />
...<br />
MYMESSAGEDATA* pData = new MYMESSAGEDATA;<br />
pData->nInteger = 1;<br />
pData->nString = "string";<br />
...<br />
...<br />
<br />
::SendMessage(hwnd, msg, NULL, (WPARAM)pData); <br />
<br />
...<br />
LRESULT CProvaDlg::OnMyMessage1(WPARAM wParam, LPARAM lParam)<br />
{ <br />
MYMESSAGEDATA* pIncomingData = (MYMESSAGEDATA*)lParam;<br />
<br />
<br />
...<br />
...<br />
<br />
delete pIncomingData;<br />
<br />
return 0;<br />
}<br />
As you can see in above example, you have a spare wParam which could be used to pass, for example, ID of the sender of the message, consider it as another advantage of this approach.
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Rouslan Grabar [Russ] wrote:
struct MYMESSAGEDATA
{
int nInteger;
char* nString;
// add here anything you want later
// e.g. status flags, length of a string, etc.
};
...
Sounds similiar to WM_COPYDATA
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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Tnx a lot
very useful
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I need to know if there is any source code that has implemented tree view and MDI association just like windows explorer.But i need to draw graphical data on the windows.So any articles or source code that has this feature.
I have implemented the same but iam facing huge memory problem and deletion of
tree nodes and their mapping to the MDI Windows has been done tediously but not stable.
So any source code available with that complies to MDI doc -view architecture.
Thanx in advance
laiju
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I want to connect a second mouse to the computer (XP). This mouse should have its own cursor and I want full control of it i.e. all mouse events must be captured and handled by my application regardless of the cursor positition and which application is active.
I have tried with DirectInput but this does not work since in XP all attached mouse devices are treated as the system mouse. I have also tried Raw Input but this is dependent of the windows message WM_INPUT and can thus only capture mouse events generated when my application is active.
Do I need to write a mouse driver or is there a simpler solution?
Thanks in advance,
Christian
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chribben wrote:
This mouse should have its own cursor
Think about what would happen if that were possible. What would GetMessagePos() and GetCursorPos() return?
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD
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hi all,
I want to use C# to interop with the shell extension, for example the DLL from this code(http://www.codeproject.com/shell/shellextguide1.asp[^]) using pinvoke.
Can I define my own STDAPI in the DLL?
how the STDAPI controls the DllMain?
The final objective I want to archieve is to use C# to control the DLL to change the menuitem name of the context menu, but is it possible?
Thank you
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After reading a little about MFC i have started to write the program after i wrote it and tried run it it gave me this error--->
LINK : fatal error LNK1104: cannot open file "nafxcwd.lib"
i am using the V C++ that comes with the book is this the reason i have change the settings and all the to include MFC shared DLL i guess from NO MFC . is it becoz the CD is an Introductory edition it not running by the way the program i am trying to run is copy paste program from a Deitel book and if it is not form the CD tell if u please tell me the answer urgently
thank u in advance
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newerStudent wrote:
LINK : fatal error LNK1104: cannot open file "nafxcwd.lib"
Have you verified that this file exists on the development machine? Do you get a similar error when compiling for "Release" instead of "Debug" mode?
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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newerStudent wrote:
LINK : fatal error LNK1104: cannot open file "nafxcwd.lib"
This file should be present under MFC\lib.
<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw
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I tried to get the currently clicked item on the tree ctrl using the foll.
code But it does not return me the current item.
What could be wrong
void COSDDlgBar::OnNMClickTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
CTreeCtrl *pm_Tree = NULL;
pm_Tree = (CTreeCtrl*)GetDlgItem(IDC_TREE1);
HTREEITEM hItem = pm_Tree->GetSelectedItem();
*pResult = 0;
}
laiju
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I don't think the selection will change until after the NM_CLICK has been processed.
Try handling TVN_SELCHANGED and call your code from there. (or better yet, use the itemNew variable in the NM_TREEVIEW struct)
 Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!
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I tried to get the currently clicked item on the tree ctrl using the foll.
code But it does not return me the current item.
What could be wrong
void COSDDlgBar::OnNMClickTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
CTreeCtrl *pm_Tree = NULL;
pm_Tree = (CTreeCtrl*)GetDlgItem(IDC_TREE1);
HTREEITEM hItem = pm_Tree->GetSelectedItem();
*pResult = 0;
}
laiju
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Try it like this:
void COSDDlgBar::OnNMClickTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
CTreeCtrl *pm_Tree = (CTreeCtrl*)GetDlgItem(IDC_TREE1);
POINT pt;
GetCursorPos(&pt);
pm_Tree->ScreenToClient(&pt);
HTREEITEM hItem = pm_Tree->HitTest(CPoint(pt));
*pResult = 0;
}
_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do?? 
(doesn't work on NT)
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can we implement udp sockets in lan which is running on windows xp regardless of its drawbacks.
Be FaithFull To Your Work.
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Usman Tasleem Akshaf wrote:
can we implement udp sockets in lan which is running on windows xp regardless of its drawbacks.
Yes.
-------------------------------
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Can u please refer me to some specific link from where i can get some information about UDP sockets from implementation point of view.Do help.
Thanks
Be FaithFull To Your Work.
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hi
plz tell me what does UNC stand for and what it its purpose, any link.
Be FaithFull To Your Work.
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Usman Tasleem Akshaf wrote:
tell me what does UNC stand for and what it its purpose, any link.
UNC == Universal Naming Convention
Here is a link to some info at Microsoft.com
Microsoft.com[^]
Google
Google.com[^]
-------------------------------
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i want to send mail from my program without having email account, and without automation.
is it possible?
raviv yatom
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Sure it is possible.
There are two ways of sendinig an EMail:
1. use a relay server
if you chose this option you you need a SMTP server that does not need authentication. You can use the SMTP-Server that is part of Microsoft's IIS.
2. Send directly to the recipient
Just do a MX DNS lookup on the email adress and then send post the mail directly to the recipients mailserver using SMTP over port 25.
Then you need to create a mime message for the mail you'd like to send. (see rfc 822 for this).
Then you need to deliver the mail. Again two options:
1. if you use the IIS's SMTP server (or any other server that supports a drop directory) you can simply save you message to the mailserver's drop directory (C:\Inetpub\smptroot\pickup). The SMTP server will queue the mail and send it to the recipient.
2. open a connection on port 25 to the recpients mail server, send HELO etc...
An answer for the implementation details of MIME mails and the SMTP protocol would exceed the frame of the forum by far.
But as far as i remember there are good articles on both issues.
/cadi
24 hours is not enough
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Hi,
For some reason, if I call multiple sendto's, like this:
sendto(sock, etc etc);
sendto(sock, etc etc);
sendto(sock, etc etc);
Then I have a recvfrom loop threaded on my client side, the recvfrom will often receive all the data from multiple sendto's in one 'big' packet and stuff it all together so I can't parse it correctly. What the hell?? Isn't it possible to send a number of TCP packets right after each other and have them received separately??
Thanks!
Kelly Ryan
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No, because TCP is a streaming protocol.
Because TCP is reliable (in-order and reliable), you can however wait until you have read a certain number of bytes and then assume that is one 'packet'.
For fixed size packets this means you end up with something like
read( packet, sizeof(Packet) )
read( packet, sizeof(Packet) )
And for variable size packets:
read( packetsize, sizeof(long) )
read( packet, packetsize)
read( packetsize, sizeof(long) )
read( packet, packetsize)
As an aside, ::send() and ::sendto() are generally used for UDP, whilst TCP normally only uses ::send()
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