C / C++ / MFC Discussion Boards

Re: Member Function

Abhi Lahare12-Jul-06 2:28

Abhi Lahare

12-Jul-06 2:28

what do you mean by Super Function?

Re: Member Function

ashish dogra12-Jul-06 2:37

ashish dogra

12-Jul-06 2:37

super means any good function that help me alot and with which something interstig thing can be handled
thanks for ur reply

Ashish Dogra
MCA
Noida

Re: Member Function

Kharfax12-Jul-06 2:48

Kharfax

12-Jul-06 2:48

Start working in any project and thinking on how to do it you'll learn a lot.
It's useless to tell you something, because there are not such thing as "super functions",
just classes wich are usefull for certain things.
Anyway I belive CString is the more usefull class in MFC and I always use it, there you have something to begin with.

Re: Member Function

ashish dogra12-Jul-06 2:52

ashish dogra

12-Jul-06 2:52

thanks ur valuable advise Kharfax
but can u tell me some project for working and tell me about CString as iam beginner to vc++

Ashish Dogra
MCA
Noida

Re: Member Function

David Crow12-Jul-06 2:57

David Crow

12-Jul-06 2:57

ashish dogra wrote:
but can u tell me...about CString

See here.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: Member Function

Zac Howland12-Jul-06 3:59

Zac Howland

12-Jul-06 3:59

ashish dogra wrote:
thanks ur valuable advise Kharfax
but can u tell me some project for working and tell me about CString as iam beginner to vc++

New to VC++ or new to C++ in general? Assuming the latter, you should start with some intro to C++ books. Sams publishing has a "Teach yourself C++ in 21 days" that is decent for getting started. After you have a foundation with C++ to work with, then you will want to check out Petzold's books and Prosise's book.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

CSingleLock Assertion Failed

mcgmil12-Jul-06 2:19

mcgmil

12-Jul-06 2:19

Hi

I am using CSingleLock in a program with a primary thread and a worker thread. On start up or if I do certain operations (both in debug mode) the debuger throws up a Debug Assertion at line 160 in mtex.cpp.

Line 160 shows the floowing

ASSERT(!m_bAcquired);

Does anybody know what the problem is as it’s driving me crazy.

Thanks in advance.

MTM

Re: CSingleLock Assertion Failed

David Crow12-Jul-06 2:44

David Crow

12-Jul-06 2:44

mcgmil wrote:
Line 160 shows the floowing

ASSERT(!m_bAcquired);

This apparently is not VC++ v6. Correct?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: CSingleLock Assertion Failed [modified]

o.sanchez12-Jul-06 2:50

o.sanchez

12-Jul-06 2:50

How are you creating the singlelock? it seems that the syncobject you are using its not valid.

Example:
CCriticalSection g_CS; //global or class member

func()
{
CSingleLock SLock(&g_CS, TRUE);

}

Good luck.

-- modified at 8:50 Wednesday 12th July, 2006

Re: CSingleLock Assertion Failed

mcgmil12-Jul-06 5:37

mcgmil

12-Jul-06 5:37

I am Using Visual C++ Standard 2003

In the document header are the following declarations

CCriticalSection ImageInfoSyncObject;
CSingleLock * pImageInfoLock;

In the constructor of the document .ccp file a new single lock object is created

CDoc::CDoc()
{
pImageInfoLock = new CSingleLock (&ImageInfoSyncObject);
}

Then I use the lock and unlock within a function.

Void CDoc::Function()
{
pImageInfoLock->Lock ();
//Code
.
.
.
.
pImageInfoLock->UnLock ();
}

Has anybody any further ideas as to why I get the Debug Assertion Failure for mtex.ccp line 106

Thanks

MTM

Re: CSingleLock Assertion Failed

o.sanchez12-Jul-06 20:59

o.sanchez

12-Jul-06 20:59

If i put this code in a function it works perfectly (in VS2005), Try it:

{
CCriticalSection ImageInfoSyncObject;
CSingleLock * pImageInfoLock;
pImageInfoLock = new CSingleLock(&ImageInfoSyncObject);
pImageInfoLock->Lock();
pImageInfoLock->Unlock();
}

Auto UnInstall after specified time

raj_all7912-Jul-06 2:00

raj_all79

12-Jul-06 2:00

Hi ,
I want my application will be auto UnInstall after specified time.Suppose I want after one year my application automatically uninstall.
I created custome vc++ exe app for Install/unInstall my application.
so what should I do to achieve autoUnInstall.
Please help me

____________
____________
Thanks & Regards
Rajesh k singh
India

Re: Auto UnInstall after specified time

Jonathan [Darka]12-Jul-06 2:10

Jonathan [Darka]

12-Jul-06 2:10

You need to be careful, it should be up to the user when they uninstall as I believe it could be illegal for your application to modify the customers machine in this way, what if the uninstall went wrong and broke the customers machine.

Darka [Xanya]

Re: Auto UnInstall after specified time

David Crow12-Jul-06 2:48

David Crow

12-Jul-06 2:48

raj_all79 wrote:
I want my application will be auto UnInstall after specified time.

See here.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: Auto UnInstall after specified time

*Dreamz12-Jul-06 3:21

*Dreamz

12-Jul-06 3:21

Check this[^]

video ram

samira forooghi12-Jul-06 1:55

samira forooghi

12-Jul-06 1:55

hi
i want write and read one byte on the special address of VGA Ram .
if you have information about it,or you know articles about it
please help me.

Re: video ram

includeh1012-Jul-06 2:48

includeh10

12-Jul-06 2:48

DirectX can lock, read and write to Video memory.
But I can not remomber exact process how to do it.
most of DirectX samples include code u need.

Re: video ram

David Crow12-Jul-06 2:54

David Crow

12-Jul-06 2:54

samira-samehforooghy wrote:
i want write and read one byte on the special address of VGA Ram .

This is something we used to back before Windows. Haven't had the need since. What exactly are you trying to do?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: video ram

Hamid_RT12-Jul-06 3:21

Hamid_RT

12-Jul-06 3:21

Can you be more specific

whitesky

same structure behave differntly in different application

pavan105nagarbhavi12-Jul-06 1:48

pavan105nagarbhavi

12-Jul-06 1:48

Hi,
I have two Visual C++/MFC application's in both the application I have the
same structure the structure is as follows
struct lat_lon1 {
char news;
short deg;
short min;
float sec;
}lat;
In one application the size of the structure is 10 and in the other it is 12
In the application which shows the structure size as 10 I am writing the data of the structure using fwrite command
fwrite((struct lat_lon1*) &lat, sizeof(struct lat_lon1), 1, fw);
and creating the same structure I am reading the file using the command
fread((struct lat_lon1*) &lat, sizeof(struct lat_lon1), 1, fw);
but I am unable to read the file.

I saw the settings of both the application's but they appear to be the same

Can anybody please help me in this regard

Pavan P

Re: same structure behave differntly in different application

_AnsHUMAN_ 12-Jul-06 2:16

_AnsHUMAN_

12-Jul-06 2:16

size_t fwrite(
const void *buffer,
size_t size,
size_t count,
FILE *stream
);
and you are typecasting to struct lat_lon1* instead of what it should be as marked above in the declaration for the write method . This could be one of the reasons for which you are not able to read the files

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

_AnShUmAn_

Re: same structure behave differntly in different application

David Crow12-Jul-06 2:59

David Crow

12-Jul-06 2:59

pavan105nagarbhavi wrote:
In one application the size of the structure is 10 and in the other it is 12

Do you have the #pragma pack directive, or are you using the /Zp compiler switch?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: same structure behave differntly in different application

Zac Howland12-Jul-06 3:41

Zac Howland

12-Jul-06 3:41

pavan105nagarbhavi wrote:
struct lat_lon1 {
char news;
short deg;
short min;
float sec;
}lat;

With the default compiler switches/directives, this structure will be packed as follows:

struct lat_lon1 
{
	char news;	// 1 byte
	char junk1;	// 1 byte
	short deg;	// 2 bytes and must be on 2-byte boundary
	short min;	// 2 bytes and must be on 2-byte boundary
	short junk2;	// 2 bytes and must be on a 2-byte boundary
	float sec;	// 4 bytes and must be on a 4-byte boundary
}lat;

That is where you get the sizeof(lat_lon1) == 12 from. Now, with some varying directives (#pragma pack for example), you could get it packed as follows:

struct lat_lon1 
{
	float sec;	// 4 bytes and must be on a 4-byte boundary
	char news;	// 1 byte
	char junk1;	// 1 byte
	short deg;	// 2 bytes and must be on 2-byte boundary
	short min;	// 2 bytes and must be on 2-byte boundary
}lat;

which would give you sizeof(lat_lon1) == 10. This is a very good example of why it is important to declare variables in a certain order for complex types.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Registry - RegSetValuEx - Returning Access denied ??

elitecodex12-Jul-06 1:43

elitecodex

12-Jul-06 1:43

Hey everyone. I have a function that reads in a registry value (for
the windows firewall) and one that disables it.

<code>
void wxJobsPanel::DisableWindowsFirewall()
{
HKEY hkeyFirewall;

/*
if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE, registryLocations[0], 0, KEY_ALL_ACCESS, &hkeyFirewall) != ERROR_SUCCESS)
wxLogError("FAILED - Could not open the firewall policy registry entry");
*/
if ( RegCreateKeyEx(
HKEY_LOCAL_MACHINE,
registryLocations[0],
0,
NULL,
REG_OPTION_NON_VOLATILE,
KEY_WRITE,
NULL,
&hkeyFirewall,
NULL) != ERROR_SUCCESS )
wxLogError("FAILED - Could not open the firewall policy registry entry");

else
{
DWORD value = 0;
if ( RegSetValueEx(hkeyFirewall, "EnableFirewall", 0, REG_DWORD, (LPBYTE) &value, sizeof(DWORD)) != ERROR_SUCCESS )
{
ErrorString("DisableWindowsFirewall()");
wxLogError("FAILED - Could not set the EnableFirewall value");
}
RegCloseKey(hkeyFirewall);
}
}</code>

The error is in RegSetValue. It returns "Access denied". ErrorString
is almost taken completely out of the PlatformSDK which is how Im
getting the error. Ive tried both methods above, using both the RegCreateKeyEx and RegOpenKeyEx. I can open (and read in a different function) with no problem. I can edit the value no problem using regedit. Just this seems to fail and I do not know why.

I've also tried opening the key with KEY_ALL_ACCESS and KEY_SET_VALUE
in combination with KEY_WRITE | KEY_READ.

Any ideas? The user is in the Administrator group. Thanks!

Re: Registry - RegSetValuEx - Returning Access denied ??

Steve S12-Jul-06 3:11

Steve S

12-Jul-06 3:11

Why fiddle with the registry at all? Why not just use the INetFwRemoteAdminSettings interface to the firewall in the first place?

[fx:mutters]
honestly, what's the point in having a published API if people are just going to hack the registry anyway....
[fx:off]

Steve S
Developer for hire

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