C / C++ / MFC Discussion Boards

Re: Problem about Precompiled Header (*.pch) directive

TooShy2Talk8-Oct-07 21:58

TooShy2Talk

8-Oct-07 21:58

Thank you very much nave for your time.

I have also figured it out.

Till next post. God Bless.

How to update a particular contol?

Sethuraman.K8-Oct-07 21:10

Sethuraman.K

8-Oct-07 21:10

For example, Inside a Dialog i have 3 edit controls. If i want to update all 3 controls, i will call UpdateData(True). If, i want to update only a particular contol value(i.e. i don't want to update remaining 2 controls value). how is it possible?

Sethuraman.K

Re: How to update a particular contol?

Naveen8-Oct-07 21:34

Naveen

8-Oct-07 21:34

Use SetDlgItemText().

nave

[OpenedFileFinder]

Re: How to update a particular contol?

ThatsAlok8-Oct-07 21:53

ThatsAlok

8-Oct-07 21:53

Sethuraman.K wrote:
For example, Inside a Dialog i have 3 edit controls. If i want to update all 3 controls, i will call UpdateData(True). If, i want to update only a particular contol value(i.e. i don't want to update remaining 2 controls value). how is it possible?

Sethuraman.K

Use Control's SetWindowText api!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
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Re: How to update a particular contol?

Sethuraman.K8-Oct-07 23:22

Sethuraman.K

8-Oct-07 23:22

Thanks Alok & Naveen.

I Have another Method also. But I don't know is it correct method or not.

CButton *but = (Cbutton*) GetDlgItem(IDD_CNT1);
but->UpdateData(TRUE);

Sethuraman.K

Re: How to update a particular contol?

Hamid_RT9-Oct-07 0:55

Hamid_RT

9-Oct-07 0:55

What do you want to do?

Re: How to update a particular contol?

ram.Jaddu9-Oct-07 0:43

ram.Jaddu

9-Oct-07 0:43

hi sethuraman,

declare control varaible for each edit box in the classwizard member variable tab.
call that method updatedata(bool) for corresponding edit box variable. and up date to true. then u can acheive ur goal.
eg code:
m_ctrlEdtVar1.UpdateData(true);
here m_ctrlEdtVar1 is the control variable for edit box one.
i hope now u understood.
bye

Re: How to update a particular contol?

ram.Jaddu9-Oct-07 1:21

ram.Jaddu

9-Oct-07 1:21

hi,
this is the alternate way of implementing.it is some what better way becz you are getting dynamically.

GetDlgItem(ID_of_EditBox_control)->UpdateData(bool);

eg code :
GetDlgItem(IDC_EDIT1)->UpdateData(true);
bye

Re: How to update a particular contol?

David Crow9-Oct-07 2:56

David Crow

9-Oct-07 2:56

Sethuraman.K wrote:
...i will call UpdateData(True).

See here.

"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

CHAR or VARCHAR

Try8-Oct-07 21:05

Try

8-Oct-07 21:05

I am using SQL Server and VC++ 2005.
How to know programatically whether column type of a particular field is CHAR or VARCHAR using OLEDB or ODBC?

Re: CHAR or VARCHAR

Karismatic8-Oct-07 23:59

Karismatic

8-Oct-07 23:59

i believe that value you are retrieving from database in a "variant" variable
if so then you can differintiate using the variant type

types are:-
BSTR FAR* pbstrVal; // VT_BYREF|VT_BSTR. for varchar
char cVal; // VT_I1. for char

Regards,
Pankaj Sachdeva

"There is no future lies in any job"
"but"
"future lies in the person who holds the job"

Re: CHAR or VARCHAR

Mark Salsbery9-Oct-07 8:35

Mark Salsbery

9-Oct-07 8:35

With ODBC, you can use SQLColumns()

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

XmlReader EOF property problem

Shivian8-Oct-07 20:37

Shivian

8-Oct-07 20:37

Hi,

I'm writing some code to traverse an Xml document generated by XmlWriter. The document is extremely simple. It consists of a single element with a list of sub-elements storing some values as strings. I am having a problem using XmlReader to traverse the file to retrieve the results though.

I am running Visual Studio 2005 with .NET Framework 2.0.

Effectively what I want to do is to read each element, check a lookup table to see where to store the value associated with the element and move onto the next one. The problem is that I get a compile error when I attempt to use the EOF property.

<br />
int iRead;<br />
XmlReader ^xtr;<br />
xtr = XmlReader::Create(strFullPath);<br />
<br />
// Start traversing the list<br />
xtr->Read();<br />
<br />
while (!xtr->EOF) // THIS DOESN'T WORK!<br />
{<br />
  if ((xtr->NodeType == XmlNodeType::Element) && (xtr->Name == "AdminVal"))<br />
  {<br />
    iRead = xtr->ReadElementContentAsInt(); // store val and moves onto next node<br />
  }<br />
  // else if other cases here<br />
  else<br />
    xtr->Read(); // Move onto next node<br />
}<br />

Now the xtr->EOF does not work at all. It will not compile with it in place but if I replace it with a while(1) then it works 100% fine (except detecting the end of the list is a problem!). I know I can tell the end of the file state from the xtr->Read() return val but if the if statement is traversed, I do not get the opportunity to read the state.

The error listing is
error C2059: syntax error : '('
error C2143: syntax error : missing ';' before '{'
error C2039: 'xtr' : is not a member of 'System::Xml::XmlReader'
c:\windows\microsoft.net\framework\v2.0.50727\system.xml.dll : see declaration of 'System::Xml::XmlReader'

Is this a bug?

Thanks for any assistance!

Re: XmlReader EOF property problem

User 5838528-Oct-07 20:49

User 583852

8-Oct-07 20:49

What is EOF defined as? I suspect it may be a function in c++ and a property in c# etc so you would need to call it like a function

while(!xtr->EOF())

If that doesnt work, right click on EOF and select "Go To definition". You should be able to see how its been defined

Re: XmlReader EOF property problem [modified]

Shivian9-Oct-07 13:27

Shivian

9-Oct-07 13:27

Go to definition gives the following:

System.Boolean EOF { get; }
Member of System.Xml.XmlReader

Summary:
When overridden in a derived class, gets a value indicating whether the reader is positioned at the end of the stream.

Return Values:
true if the reader is positioned at the end of the stream; otherwise, false.

So it is definitely a property - like .Name which I used successfully several times. I think it is some sort of compiler/framework bug because even trying to assign a bool variable to xtr->EOF gives a compiler error.

EDIT: I should add that when stepping through the debugger (with while(1) instead of while(!xtr->EOF)) and looking at the properties of xtr, the EOF property IS listed and carries the expected value.

Re: XmlReader EOF property problem [modified]

ian__lindsay7-Feb-13 4:05

ian__lindsay

7-Feb-13 4:05

We just hit this one, it is because of a #define in stdio.h which defines EOF as -1. The easiest quick and dirty fix is to do a #undef EOF before the line in the file if the C library EOF define is not used further on.

message maps from derived class

prithaa8-Oct-07 19:52

prithaa

8-Oct-07 19:52

Hello,

If I hve message map functions in the base class then do I need to have message map in the derived class ?

Regards
Prithaa

Re: message maps from derived class

Naveen8-Oct-07 19:58

Naveen

8-Oct-07 19:58

No. If the function is already added in the BEGIN_MESSAGE_MAP-END_MESSAGE_MAP of the base class itself then you needn't to add it the derived class unless you want to overide it.

nave

[OpenedFileFinder]

Re: message maps from derived class

Jhony george9-Oct-07 1:08

Jhony george

9-Oct-07 1:08

hai..,
No need ...and not at all required in derived class.

Born to win...

Problem in SetWallpaper

GauranG Shah8-Oct-07 19:05

GauranG Shah

8-Oct-07 19:05

Hello Friends,

I am trying to change the Desktop Wallpaper programatically. For that I am using IActiveDesktop Interface.But not getting success, I am not getting any compile or run time error but it fails to set the wallpaper.

I am using the following code to get the path of the current Wallpaper and to set the new Wallpaper.
But I am getting only one string each time I call the GetWallpaper(), It is a follow "C:\Documents and Settings\Administrator\My Documents\My Pictures\logo.jpg"

HRESULT hr;
int Count = 0;
IActiveDesktop *pActiveDesktop;
CoInitialize(NULL);
//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
            IID_IActiveDesktop, (void**)&pActiveDesktop);
WCHAR Wallpaper[MAX_PATH];
wcscpy(Wallpaper,L"c:\\a.bmp");
pActiveDesktop->SetWallpaper(Wallpaper,0);
pActiveDesktop->ApplyChanges(AD_APPLY_ALL |  AD_APPLY_FORCE);  //nothing Happens
pActiveDesktop->GetDesktopItemCount(&Count,0);  //Geting Zero everytime
pActiveDesktop->GetWallpaper(Wallpaper,MAX_PATH,0);

I also use the SystemParametersInfo API to do the same thing. But the problem is that it only wotks with .bmp file.

If you have any IDEA please tell me. Thnx in advance.

[ Screen Capture ][ Tool Tip ]

Re: Problem in SetWallpaper

Hamid_RT8-Oct-07 19:36

Hamid_RT

8-Oct-07 19:36

Michael Dunn has an article about COMs on that article he used of this interface see this article maybe it will be helpful for you.http://www.codeproject.com/com/comintro.asp[^]

Re: Problem in SetWallpaper

GauranG Shah8-Oct-07 20:31

GauranG Shah

8-Oct-07 20:31

I see the code it same as i am using. And problem still persist.
Is there any way I can use SystemParametersInfo API to set .jpg or .jpeg images as wallpaper or retrive the path of that.

[ Screen Capture ][ Tool Tip ]

Re: Problem in SetWallpaper

aks.8-Oct-07 22:10

aks.

8-Oct-07 22:10

Pls have a look @ this. This work for me

#include <windows.h>
#include <wininet.h>
#include <shlobj.h>

//Main window procedure WinMain
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iShowCmd)
{
CoInitialize (NULL) ;

HRESULT hr;
IActiveDesktop *pActiveDesktop;

//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**)&pActiveDesktop);

//Insert code to call the IActiveDesktop methods
LPCWSTR wcPath = L"C:\\123.jpg" ;
if (pActiveDesktop -> SetWallpaper (wcPath, 0) != S_OK)
{
//The method has failed...
}

pActiveDesktop -> ApplyChanges (AD_APPLY_ALL) ;

// Call the Release method
pActiveDesktop->Release();

CoUninitialize () ;

return 0 ;
}

Ajay

Re: Problem in SetWallpaper

GauranG Shah8-Oct-07 22:45

GauranG Shah

8-Oct-07 22:45

thnx,
When I check the error code after SetWallpaper it show '0'. that means "The operation completed successfully.". But wallpaper doesn't changed.

I am using like this.

if (pActiveDesktop -> SetWallpaper (Wallpaper, 0) != S_OK)
				{
				 dError = GetLastError(); 
                                 //Getting dError = 0   
				}

Can you tell me what can be the problem.

[ Screen Capture ][ Tool Tip ]

Re: Problem in SetWallpaper

aks.8-Oct-07 22:47

aks.

8-Oct-07 22:47

did u call the pActiveDesktop -> ApplyChanges (AD_APPLY_ALL) ; ?

Ajay

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