C / C++ / MFC

Re: How &quot;Winmain()&quot; works in MFC? and From where it is called?

10-Oct-07 20:01

Sethuraman.K wrote:
I want to know How Winmain() functions working nature. Also, I want to know from where it is get called?

The call stack when execution reaches WinMain is as follows..

WinMain(HINSTANCE__ * 0x00400000, HINSTANCE__ * 0x00000000, char * 0x00141f09, int 1) line 27
WinMainCRTStartup() line 330 + 54 bytes
KERNEL32! 7c816fd7()

Press F10(I am using VC6) to see how execution starts in an MFC application. Step through the code. Don't forget there is a global CWinApp object too.

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Sethuraman.K10-Oct-07 20:07

Sethuraman.K

10-Oct-07 20:07

Thanks Nibu

Sethuraman.K

Re: How "Winmain()" works in MFC? and From where it is called?

David Crow11-Oct-07 3:36

David Crow

11-Oct-07 3:36

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

Registry Restore Using A Service

nagadravid10-Oct-07 19:35

nagadravid

10-Oct-07 19:35

Hi,

I have implemented a service which will create and restore registry back ups.
Service runs under local system account.

I am able to take backup and restore in admin mode using the service.
But in Guest user mode I m unable to resore the Registry back up.

Any one can help me out in this.

Re: Registry Restore Using A Service

vipin_nvk10-Oct-07 21:09

vipin_nvk

10-Oct-07 21:09

hm.. i faced a similar problem last week.

The problem is that a windows service runs in a LOCAL SYSTEM account and not in the account in which the user is currently logged in. Hence, if you try to take backups under registry key HKCR then the registry back up would fail.

What you have to do under this condition is write a code something like this:

<br />
HKEY hKey;	<br />
long error;<br />
<br />
HANDLE hToken = NULL;<br />
BOOL bEnablePrivilege  = TRUE;<br />
<br />
// obtain the explorer handle to get the hToken<br />
if(GetExplorerToken(hToken)) // write ur function to get explorer token!!<br />
{<br />
 if(hToken != NULL)<br />
 {<br />
	ImpersonateLoggedOnUser(hToken);<br />
<br />
	error = RegOpenKeyEx(HKEY_CURRENT_USER,strRegPath,0,KEY_ALL_ACCESS,&hKey);<br />
<br />
	RevertToSelf();<br />
 }<br />
}<br />

Now, you can use the hKey obtained to open the required registry key under HKCR and take the back up!!

Cheers

Help:Multi-threading

himuskanhere10-Oct-07 19:26

himuskanhere

10-Oct-07 19:26

Hey frnds how multithreading is achieved!
i read 2-3 articles on it..but find those were difficult...
Can u please give me any reference where Multithreading is explained from basic...

Thanks;P;P

UuidFromString not creating GUID correctly - Help!

Priya_Sundar10-Oct-07 19:10

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 19:10

In this function i am trying to disable the dchp in the adapter register key.
Also i am notify the NICs driver that the settings have changed.

bool CTcpIpPropertiesChangerApp::DisableDchp()
{
char szValue[MAX_GUID_STRING_LEN];
CString str,str2;
DWORD pdw=99;
CRegKey key,key2;

for(int flag=1;flag<=100;flag++)
{
str.Format("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards\\%d",flag);

if(key.Open(HKEY_LOCAL_MACHINE,str,KEY_READ|KEY_WRITE)==ERROR_SUCCESS)
{
key.QueryValue(szValue,"ServiceName",&pdw);
key.Close();

str.Format("SYSTEM\\CurrentControlSet\\Services\\TcpIp\\Parameters\\Interfaces\\%s",szValue);

key.Open(HKEY_LOCAL_MACHINE,str,KEY_WRITE);

key.Open(HKEY_LOCAL_MACHINE,str,KEY_WRITE);

DWORD keyy=0;
::RegSetValueEx(key.m_hKey,"EnableDHCP",0,REG_DWORD,(PBYTE) &keyy,sizeof(PDWORD));

key.Close();

HDEVINFO hDevInfo = SetupDiGetClassDev (NULL,NULL,NULL,DIGCF_ALLCLASSES);
if( INVALID_HANDLE_VALUE == hDevInfo )
{
AfxMessageBox("Error :SetupDiGetClassDevs()");
return FALSE;
}

//An SP_PROPCHANGE_PARAMS structure corresponds to a DIF_PROPERTYCHANGE installation request.
SP_PROPCHANGE_PARAMS spPropChangeParams;
spPropChangeParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
spPropChangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
spPropChangeParams.Scope = DICS_FLAG_GLOBAL;
spPropChangeParams.StateChange = DICS_DISABLE;
spPropChangeParams.HwProfile = 0;

//An SP_DEVINFO_DATA structure defines a device instance that is a member of a device information set.
SP_DEVINFO_DATA spDevInfoData;

spDevInfoData.cbSize = sizeof(SP_DEVINFO_DATA);

for (int k=0;SetupDiEnumDeviceInfo(hDevInfo,k,&spDevInfoData);k++)
{
unsigned char GuidString[MAX_GUID_STRING_LEN];
GuidString[MAX_GUID_STRING_LEN - 2] = _T('\0');

for(int l=0;l<max_guid_string_len;l++)
guidstring[l]="szValue[l];

" guid="" ret;
="" uuidfromstring(&guidstring[1],="" &ret);

="" if(spdevinfodata.classguid="=" ret="" )
="" {
="" setupdisetclassinstallparams="" sets="" or="" clears="" class="" install="" parameters="" for="" a="" device="" information="" set="" particular="" element.=""
="" if="" (="" setupdisetclassinstallparams(hdevinfo,="" &spdevinfodata,="" (sp_classinstall_header="" *)&sppropchangeparams,="" sizeof(sppropchangeparams))="=" false)="" setupdidestroydeviceinfolist="" (hdevinfo);
="" return="" false;="" }

="" setupdicallclassinstaller="" calls="" the="" appropriate="" installer,="" and="" any="" registered="" co-installers,="" with="" specified="" installation="" request="" (dif="" code).
="" (setupdicallclassinstaller(dif_propertychange,="" hdevinfo,="" &spdevinfodata)="=FALSE)" }
="" }="" }
}<="" code="">

For this i am trying to create a GUID inside the second for loop where in i get "{CCCCCCCC-CCCC-CCCC-CCCC-CCCCCCCCCCCC}" as 'ret' value instead of {A89377EA-D4ED-4A03-A303-A37F-4A9DE785E1A9} which is the '&GuidString[1]' value.

I think i need to typecast correctly.

Kindly help!

Priya Sundar

Sachinpatole10-Oct-07 19:15

Sachinpatole

10-Oct-07 19:15

use
GUID *ret;
ret = new GUID;

instead of
GUID ret;

after that delete ret

-Sachin

Re: UuidFromString not creating GUID correctly - Help!

Priya_Sundar10-Oct-07 19:27

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 19:27

hi sachin,

Thanks for replying.

But that didnt work. Now the 'ret' just gets created with the default value 'CDCDCDCD-CDCD-CDCD-CDCDCDCDCDCD}' and the funtion UuidFromString() produces no effect on it.

any other idea??

Priya Sundar

Nibu babu thomas10-Oct-07 19:36

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 19:36

Priya_Sundar wrote:
GUID ret;
UuidFromString(&GuidString[1], &ret);

GUID ret = { 0 };
UuidFromString(GuidString, &ret);

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Priya_Sundar10-Oct-07 19:43

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 19:43

Hi,

That didnt work.

now 'ret' is created with default val "{00000000-0000-0000-0000-000000000000}" and the function UuidFromString() causes no effect..

Thankyou for your sugesstion!

Any more ideas??

Priya Sundar

Nibu babu thomas10-Oct-07 19:47

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 19:47

Priya_Sundar wrote:
UuidFromString

What does the return value from UuidFromString say. Refer MSDN for more information. Check given GUID string.

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Priya_Sundar10-Oct-07 20:34

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 20:34

MSDN:

This is the syntax of the function UuidFromString() for the version vc++6.0

RPC_STATUS RPC_ENTRY UuidFromString
(
unsigned char *StringUuid,
UUID *Uuid
);

New 2005 version:
RPC_STATUS RPC_ENTRY UuidFromString
(
unsigned char __RPC_FAR* StringUuid,
UUID __RPC_FAR* Uuid
);

I am using vc++6.0 with PSDK and i guess __RPC_FAR wont be the cause of the problem.

Further, i have modified it as,

unsigned char *GuidString;
GuidString = (unsigned char *)szValue;
//szValue being declared as "char szValue[MAX_GUID_STRING_LEN];" and having a val "{A89377EA-D4ED-4A03-A37F-4A9DE785E1A9}"

GUID ret = { 0 };
UuidFromString(GuidString,&ret);

now UuidFromString returns RPC_S_INVALID_STRING_UUID stating that the string UUID is invalid.

Priya Sundar

Nibu babu thomas10-Oct-07 20:37

Re: UuidFromString not creating GUID correctly - Help!

10-Oct-07 20:37

Priya_Sundar wrote:
and having a val "{A89377EA-D4ED-4A03-A37F-4A9DE785E1A9}"

Try removing "{...}" from the beginning and from the end of the string.

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Priya_Sundar10-Oct-07 21:07

10-Oct-07 21:07

Hai Nibu,

wowwww!!!!!

Thanks a lotttttttttttttttttttttt!!

It solved it.

Have a nice day. Smile | :)

Priya Sundar

What is core dump ?

Yashusid10-Oct-07 18:52

Yashusid

10-Oct-07 18:52

Hi,

I have heard of core dump, but i have no idea what is it ? How to use it in Visual Studio for debugging ?

Is it a file ??

Please help me in understnading this....

Messagebox problem

Lakshmi_p10-Oct-07 18:41

Lakshmi_p

10-Oct-07 18:41

Hi,
I want to replace the message box icon with my own icon. But i don't know how to get the Handle to message box icon.

Any suggestions are welcome. Smile | :)

Sachinpatole10-Oct-07 19:18

Sachinpatole

10-Oct-07 19:18

U will have to design a dialog box similar to message box and calll domodal for this newly designed dialog.

-sachin

Nibu babu thomas10-Oct-07 19:31

10-Oct-07 19:31

Lakshmi_p wrote:
I want to replace the message box icon with my own icon. But i don't know how to get the Handle to message box icon.

Use MessageBoxIndirect and MSGBOXPARAMS. Look here[^] for a demo.

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Naveen10-Oct-07 20:06

Naveen

10-Oct-07 20:06

Ho. Simple solution. I removed my post.

nave

[OpenedFileFinder]

Nibu babu thomas10-Oct-07 22:10

10-Oct-07 22:10

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com