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If you use of CB_ADDSTRING for insert data to combobox instead property window what happens?
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Whitesky cant we enter the default data in the combo box which we do in the MFC, where we enter the data in properties..
In api I have to enter each data to the combo box by code ??? using add string ??
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Suresh H wrote: And in the code I have used below code to set the default Combo box value to 0.
case WM_INITDIALOG:
{
HWND hwndCombo = GetDlgItem(hwnd, IDC_COMBO);
SendMessage(hwndCombo,CB_SETITEMDATA,0,0);
}
break;
You are using wrong message for setting value.CB_SETITEMDATA is used to set item data for particular index.
I'm not clear about your wording, I'm assuming that you want first value to be selected and default selection.
You do this by using,
HWND hwndCombo = GetDlgItem(hwnd, IDC_COMBO);
SendMessage(hwndCombo,CB_CB_SETCURSEL,0,0);
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Hello Prasad,
Thanks for the responce.
<br />
HWND hwndCombo = GetDlgItem(hwnd, IDC_COMBO);<br />
SendMessage(hwndCombo,CB_SETCURSEL,0,0);
Actually I have added numbers from 0– 10 in the Combo box properties under data.
After the dialog load combo box is empty no values in that . can u plz tell me what is wrong ???
Yes I want the default value to be selected to 0.
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That properties page where you enter the initial data for the combo box only works in MFC apps.
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Hello Friends
Can any body on the forum
Could help me out in knowning how can one Send a file through UDP.
Is there any specific function for the doing the same, or any separate mechanism
is required.
My following requirement is for VC++ 7.1/6.0
Girish
Software Developer
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Why would you send a file using UDP?
UDP is connectionless which means that there's no guarantee that the packet will reach the receiver. Under normal circumstances it would reach the receiver, but you cannot assume that. Thus parts of you file may be lost during the transmission.
On the other hand; using UDP is exactly the same as using TCP.
You open a socket and send to a receiving socket providing the address and port.
Hope this helps
--
Roger
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above
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UDP is the wrong protocol to use for file transfers. There is no guarantee that packets will even arrive at the destination.
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I don't agree that UDP is "wrong". It depends on the application.
For example UDP is massively better than TCP if you want to multicast to multiple hosts.
But yes, you do have to handle transmission problems yourself - you don't get return codes from the APIs that you do with TCP.
It is also difficult to make UDP secure - then again TCP isn't secure on its own (needs a security layer such as SSL).
cheers,
Neil
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Hello Neil,
Thanx for your timely suggestion
Can i know exactly further how should i go ahead.
I want to send a file through UDP.
I am aware of it using in TCP.
Can i know how it is done in UDP
Thanx in Advance
Girish
Software Developer
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As already mentioned, it isn't a good idea to do file transfer over UDP given it is connectionless. Doing it over TCP (with or without a security layer) will be easier and more reliable.
I believe that the TFTP system is designed to transfer files over UDP. Although TFTP isn't really used these days, I think from memory that the process of remote booting a workstation uses it, and transfers the boot image from the server to the client over UDP.
Therefore, if you absolutely must transfer a file over UDP and have no other options, see if you can find an open source TFTP program to give you some pointers on how to do it. Most likely you will find the code to be *nix oriented though. You may even be lucky enough to find a TFTP library you can use as well.
------------------------
Luke Lovegrove
------------------------
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How to DoModal a winodw on all of the othere programs; winodws
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Use extended style WS_EX_TOPMOST while creating dialog.
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Hi,
assume i want to create a dynamic array of bytes(or any other data type) (unsigned char *p = new unsigned char[100];), how can i ensure that it is aligned to a 32-bit boundary?
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#pragma pack(push, 4)
unsigned char* p = new unsigned char[100];
#pragma pop()
will do it, I think. (I'm not sure how is new affected by pragma pack).
Nuclear launch detected
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I am afraid that #pragma pack will have no impact on the above code, its primarily used to align members of a structure, such as this:
#pragma pack(push, 1)<br />
struct myStruct<br />
{<br />
char szTmp[20];<br />
short iIndex;<br />
...<br />
}<br />
#pragma pop()<br />
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Yes, you'll probably right. What am I saying, for sure you're right.
Then the only way I can think of is to align the allocation size to DWORD.
There was a ALIGN_DWORD (or DWORD_ALIGN) macro or something - anyway was something like (memory quote)
((p + 3) & ~3)
This one
#define ALIGN_CLUSPROP( count ) ((count + 3) & ~3)
is from ClusApi.h, but the idea is the same.
In this way the buffer will not allocate, say, 102 bytes, but (102 + 3) & ~3 = 105 & ~3 = 104.
Nuclear launch detected
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True, hopefully this will work.
According to the C++ standard:
"The C++ standard guarantees that all memory allocated via operator new or malloc will be suitably aligned for any possible kind of object you might want to store in it, which means that operator new and malloc have to respect the strictest possible type alignment requirement of the native platform."
so just using new with the correct size should work
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I think pragma pack doesnt work with dynamic variables, objects. I cant find anywhere on the internet about aligning dynamic objects using pragma pack or any other way. Or is it because dynamic objects are aligned by default to 32-bit boundary?
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I am not sure you will be able to do this, its up to the Windows Memory manager as to where the memory will be allocated.
Why do you need to do this anyway ?
-- modified at 4:31 Wednesday 10th January, 2007
You obviously cannot use #pragma, but the new keyword performs byte alignment for you anyway so just try that.
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I'm doing image processing, and i need to maximize the performance of a real-time program. I'm using intel's integrated performance libraries, which recommends that the allocated data must be aligned to 32-bit boundary. Not aligned data will be processed multiple clock cycles slower. Although the library does provide its own allocation function (ippiMalloc_8u..), but i was wondering how to do it myself.
Any ideas?
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uus831 wrote: 'm doing image processing, and i need to maximize the performance of a real-time program. I'm using intel's integrated performance libraries, which recommends that the allocated data must be aligned to 32-bit boundary. Not aligned data will be processed multiple clock cycles slower. Although the library does provide its own allocation function (ippiMalloc_8u..), but i was wondering how to do it myself.
Any dynamic memory returned from malloc, GlobalAlloc, etc. is properly aligned. You need to worry about alignment only when you write your own allocator.
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