C / C++ / MFC

Problem with SetWindowsHookEx()

10-Jul-07 4:15

Maynka wrote:
I want to put some IP address in IP address control box...

Send the control a IPM_SETADDRESS message.

Maynka wrote:
...store it in a string value and pass it as parameter to some function,how i will be able to that.

You first must get the value from the control by sending it a IPM_GETADDRESS message.

"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

sumd10-Jul-07 2:50

sumd

10-Jul-07 2:50

Dear All,

Im trying keyboard locking with SetWindowsHookEx()api.
It works fine. But the problem is that after some time it
automatically unhooks and unlocks the keyboard before a call to UnhookWindowsHookEx()is made.

Thanks,
Sumedh

Thank You

Re: Problem with SetWindowsHookEx()

Perspx10-Jul-07 5:45

Perspx

10-Jul-07 5:45

Can you place the code in your message?? That might help.

--PerspX

"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates

Re: Problem with SetWindowsHookEx()

sumd11-Jul-07 0:27

sumd

11-Jul-07 0:27

Hi,

This is my code for keyboard locking.
Please check it out..

Thanks in advance,
Bye.

HHOOK hKeyboardHook = NULL;
void StartHook()
{
HMODULE hMod = NULL;
hMod = LoadLibrary("LockScr.dll");

if (hMod != NULL)
{
hKeyboardHook = NULL;
hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL,
(HOOKPROC)GetProcAddress(hMod,"KeyProc"),hMod,0);

if(hKeyboardHook != NULL)
{ MessageBox("SetWindowsHookEx OK");}
}
FreeLibrary(hMod);
}

void Unhook()
{
UnhookWindowsHookEx(hKeyboardHook);
}

/*** This Is the Code from DLL ***/

LRESULT LOCKSCR_API CALLBACK KeyProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode >= 0)
{ PostMessage(NULL,WM_USER+765,wParam,lParam);}

return nCode < 0 ? CallNextHookEx(NULL,nCode, wParam, lParam) : -1;
}

Thanks
Sumedh

Re: Problem with SetWindowsHookEx()

Perspx11-Jul-07 5:45

Perspx

11-Jul-07 5:45

Hmm.. I'm not too sure sorry Sigh | :sigh:

Why do you call FreeLibrary() after you set the hook? surely this will mean that you wont be able to unhook the hook after this as the DLL is no longer loaded into or associated with the application..

Apart from this everything seems to be OK, my LL keyboard hooking code looks almost identical to this..

Sorry I can be of no further help

--PerspX

RegSetValueEx

Yashusid10-Jul-07 2:48

10-Jul-07 2:48

Hello,

I have one command line application, where i am setting registry key values .

LPCTSTR lpResName=GetSourceName(RegFileName);
rCode=RegSetValueEx(
hDckey,
lpResName,
0,
REG_SZ,
(LPBYTE)RegFileName,
(DWORD) (lstrlen(RegFileName)+1)*sizeof(TCHAR) );

This RegSetValueEx sets the values in the registry if i run this exe in "Debug" mode setting lpResName correctly, but if i run in the "Release" mode the "Value Name" for hDckey is some garbage. whereas "Value Data" is correctly set in both the Modes.

the GetSourceName returns the correct value for lpResName in both modes.

what may be the problem with this ?
please help me...

David Crow10-Jul-07 3:07

10-Jul-07 3:07

If the first argument to RegSetValueEx() is garbage, that means the key was not opened correctly.

"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

Yashusid10-Jul-07 3:12

10-Jul-07 3:12

not any of the parameters are garbage, after executing this, if i see in the registry the "Value name" is garbage. that too it will set the "Value Name" if i run in "Debug" mode, the problem is there only if i make the exe in "Release" mode.

David Crow10-Jul-07 3:18

10-Jul-07 3:18

Yashusid wrote:
not any of the parameters are garbage,

Then why would you state, "the 'Value Name' for hDckey is some garbage?" If none of the arguments being passed to RegSetValueEx() contain garbage, then what exactly is the problem? Confused | :confused:

"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

Yashusid10-Jul-07 3:23

10-Jul-07 3:23

oops sorry if it created confusion....my intention was to convey that...

i have a key...for that key i am setting a property...

my registry entry for key

when u see in registry

Name ------------ Type ----Data
(garbage here)--- REG_SZ -- test.xml --> ------Release mode
test--------------REG_SZ -- test.xml --> ------Debug mode

i am getting garbage in Name field for the key...

David Crow10-Jul-07 4:13

10-Jul-07 4:13

Yashusid wrote:
i am getting garbage in Name field for the key...

Which would indicate that lpResName is wrong. Try:

TCHAR s[128];
_tcscpy(s, GetSourceName(RegFileName));
rCode = RegSetValueEx(hDckey,
                      s,
                      0,
                      REG_SZ,
                      (LPBYTE) RegFileName,
                      (DWORD) (_tcslen(RegFileName) + 1) * sizeof(TCHAR));

"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

Yashusid10-Jul-07 4:26

10-Jul-07 4:26

You are great!!!

Thanks a lot!!!
It works........

but please help me in understaning why it was setting correctly in "Debug" mode ?

David Crow10-Jul-07 4:30

10-Jul-07 4:30

Yashusid wrote:
but please help me in understaning why it was setting correctly in "Debug" mode ?

It's not. You just got lucky. Read here for the differences in the two.

You should now be concerned as to what GetSourceName() is doing (wrong). If the code is short enough, post it and we can take a look.

"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

Yashusid10-Jul-07 4:34

10-Jul-07 4:34

In GetSourceName i am parsing a XML file.

char *GetSourceName(char *RegFileName)
{
LPTSTR lpstrMsg;
CoInitialize(NULL);
CComPtr<ixmldomdocument> spXMLDOM;
CComPtr<ixmldomnode> spXMLNode;
IXMLDOMAttribute *pIXMLDOMAttribute = NULL;
IXMLDOMElement *pIXMLDOMElement = NULL;
HRESULT hr = spXMLDOM.CoCreateInstance(__uuidof(DOMDocument));
VARIANT_BOOL bSuccess = false;
USES_CONVERSION;
_variant_t fileNameValue=T2W(RegFileName);
hr = spXMLDOM->load(fileNameValue,&bSuccess);
if(!hr)
{
hr = spXMLDOM->get_documentElement(&pIXMLDOMElement);
_variant_t nameValue;
if(!hr)
{
hr = pIXMLDOMElement->getAttribute(CComBSTR(L"source-name"),&nameValue);

}
if ( nameValue.vt == VT_BSTR )
{
USES_CONVERSION;
lpstrMsg = W2T(nameValue.bstrVal);
}
}

spXMLDOM.Release();
CoUninitialize();
return lpstrMsg;
}

David Crow10-Jul-07 4:48

Re: about "round" function in visual C++

10-Jul-07 4:48

The memory that lpstrMsg points to is no longer valid when GetSourceName() goes out of scope. Return a CString or string object instead. Or you could leave it as is, and make the appropriate change to all places that use GetSourceName().

"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

SandipG 10-Jul-07 2:27

SandipG

10-Jul-07 2:27

This is a weird solution.. you might be aware of this.
here Format will automatically round the value.
Here advantage is you can specify decimal places you are interested in. accordingly format will round values after that decimal place.

CString str;
double d=1.516;
str.Format("%0.2lf",d);

Re: about "round" function in visual C++

Russell^'10-Jul-07 3:10

Russell^'

10-Jul-07 3:10

inline double round(double x){
	const double y = floor(x);
	if(x-y<0.5) return y;
	else return y+1;
}

Do not use casting to int if x is very big, because int value range is smaller than double range.

I don't know if it is possible to implement this function in a faster way, but i use it and it work propely.

Russell

OLEDB WITH .CDX

ArielR10-Jul-07 2:23

ArielR

10-Jul-07 2:23

I'm moving datas from old dbf files. But now a need to access them but the perform of "select * from dbftable for xCond" command is too slow. How can I access its file with the CDX index?. I'm using oledb and VC++ 6.

Get cookie from the url/web?

bosfan10-Jul-07 1:43

bosfan

10-Jul-07 1:43

Hello community,
how to recive an cookie from the web,
i have an application to open a url and show the content in browser object,
now i like to recive a cookie if posible from this url, how to do this?

thanks
termal

_AnsHUMAN_ 10-Jul-07 2:10

_AnsHUMAN_

10-Jul-07 2:10

termal wrote:
recive a cookie if posible from this ur

See if CInternetSession::GetCookie(/*parameters*/); suits your needs.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

bosfan10-Jul-07 3:44

bosfan

10-Jul-07 3:44

Hello,
i try this, but i got a error:
ERROR_INTERNET_UNRECOGNIZED_SCHEME
12006
The URL scheme could not be recognized, or is not supported.

Is here any sample for this?
thanks
termal

David Crow10-Jul-07 3:09

10-Jul-07 3:09

termal wrote:
now i like to recive a cookie if posible from this url, how to do this?

Try InternetGetCookie().

"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