C / C++ / MFC Discussion Boards

Re: Running Multiple Instances of a Static Library

doublebug21-May-05 1:43

21-May-05 1:43

yes if that instances reside in the same process.

Multi-Threaded DLL Library means that runtime code is located in the DLL.
So if some other dll use Multi-Threaded DLL Library they will share the same runtime code.
Another reason to use DLL is memory allocation. If you have some DLLs that allocates memory from inside one DLL and that memory is deallocated by another dll such dlls should use Multi-Threaded DLL Library. Static library uses its own heap so if you deallocate memory inside dll that uses Static library and memory is allocated by another dll this can couse memory leaks and even crash.

That is true if you use memory allocation routines like new and delete.

how to change font while printing in MFC

Member 94878020-May-05 5:31

Member 948780

20-May-05 5:31

How to change font while printing using MFC? I want to print different font in a page. I create new font befoe I use it. But it doesn't work.

Re: how to change font while printing in MFC

lynchspawn20-May-05 7:08

lynchspawn

20-May-05 7:08

Take a look at CDC::SelectObject().

Rotation in VC++

manishnayyar20-May-05 5:00

manishnayyar

20-May-05 5:00

How to rotate a GDI object in VC++ without using setworldtransform?

Re: Rotation in VC++

Christian Graus20-May-05 14:00

Christian Graus

20-May-05 14:00

If it's a DIBSection( i.e. you have access to the bitmap bits ), then you can perform the rotate yourself on a new DIBSection ( seeing as a rotated image is bigger. )

Christian Graus - Microsoft MVP - C++

Duplicate a file?

mcgahanfl20-May-05 4:36

mcgahanfl

20-May-05 4:36

How do you duplicate a file? Is there a windows API? Or do you just use CFile to read it in and create a new copy?

Thanks for the insight.

Re: Duplicate a file?

Tom Wright20-May-05 4:52

Tom Wright

20-May-05 4:52

Try CopyFile or CopyFileEx

here is the description:

BOOL CopyFile(<br />
  LPCTSTR lpExistingFileName,<br />
  LPCTSTR lpNewFileName,<br />
  BOOL bFailIfExists<br />
);<br />

Tom Wright
tawright915@yahoo.com

Re: Duplicate a file?

mcgahanfl23-May-05 2:44

mcgahanfl

23-May-05 2:44

Thank you. That was right on the money.

Re: Duplicate a file?

Tom Archer20-May-05 17:00

Tom Archer

20-May-05 17:00

In addition to what Tom said, I would also suggest looking at the MakeSureDirectoryPathExists function if you need to copy the file to a specific folder hierarchy.

(This function is in the dbghelp.dll, which you'll need to distribute depending on the target OS - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/debug/base/makesuredirectorypathexists.asp)

Cheers,
Tom Archer - Archer Consulting Group

"Eat your brussel sprouts, Junior. There are starving ~~Chinese children~~ American programmers that would kill for that food!"

Re: Duplicate a file?

mcgahanfl23-May-05 2:45

mcgahanfl

23-May-05 2:45

Thank you

Memory full error in C++ DLL

Ashish Chauhan20-May-05 4:22

Ashish Chauhan

20-May-05 4:22

I have made one C++ DLL using VC++ 6.0 which has a function, in this function loadlibary function which open the WAB32.DLL file and at the end of function freelibrary function was used to destroy the instance of loadlibary.But when i call this function in VB frequenty it will return memory is full message. So How to destroy the instance of loadlibary from memory.

So please solve my problem as soon as possible.

Re: Memory full error in C++ DLL

David Crow20-May-05 6:44

David Crow

20-May-05 6:44

Ashish Chauhan wrote:
But when i call this function in VB frequenty...

How are you doing this in VB?

Ashish Chauhan wrote:
...it will return memory is full message.

Have you Googled for the exact text of the message?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Memory full error in C++ DLL

Ashish Chauhan20-May-05 20:31

Ashish Chauhan

20-May-05 20:31

Sorry for less information.

I have written a function which returns all the contacts of outlook Express in this function I opened the WAB32.dll file using the loadlibrary function and then retrieve all the contacts and append then to the char * variable.
below is my function which explains you properly.

This function is frequently called by VB 6.0 DLL. if i have not more than 50 contacts it will work fine but when i have more than that it gives me "Low virtual memory " error occurs and then my whole system goes down.

Please give a solution to resolve the problem.

One more problem is that is it right way to returns the character array from VC ++ to VB 6.0?. please modify the code or give me good suggestion because VB recongnizes String and VC++ recongnizes char Array.

char *CNewOutlookExpressApp::GetWABListInStr () //Member function.
{

HRESULT hRes;
HINSTANCE hinstLib;
try
{
LPADRBOOK lpAdrBook;//Object of Address book
LPWABOBJECT lpWABObject; //Object of WAB
// LPWAB_PARAM lpWABParam ;
DWORD Reserved2 =NULL ;
fWABOpen procWABOpen;
// IABContainer *lpContainer ;
LPMAPITABLE lpTable ; //holds the image of windows address book in table format.

hRes = UpdateContactID () ;

if (hRes != 0 )
{
throw "Error";
}

ULONG ulRows;
//wab32FilePath
hinstLib = LoadLibrary(wab32FilePath); //Open the library file. file must be like C:\\Program Files\\Common Files\\System\\wab32

if (hinstLib != NULL) //Start of hinstLib Condition
{
procWABOpen = (fWABOpen) GetProcAddress(hinstLib, "WABOpen"); // get the address of WABOpen method.
if ( procWABOpen != NULL )
{
WAB_PARAM wp = {0};
wp.cbSize = sizeof(WAB_PARAM);

// Only want to deal with "Main Identity's Contacts"
wp.ulFlags = WAB_ENABLE_PROFILES;

// Creates an instance of our IAddrBook interface
// which will give us access to the WAB.

hRes = (procWABOpen)(&lpAdrBook,&lpWABObject,&wp,Reserved2); // wp parameter retrieves the Main Identity's contacts.if user pass null user can get all contacts.

_ASSERTE(hRes == S_OK);
if (hRes != S_OK)
{
exit(1);
}

ULONG lpcbEntryID;
ENTRYID *lpEntryID;
hRes = lpAdrBook->GetPAB(&lpcbEntryID,&lpEntryID); //gets the Personal Addres book.

_ASSERTE(hRes == S_OK);
if (hRes != S_OK)
exit(2);

ULONG ulFlags = MAPI_BEST_ACCESS; //it gives full access.
ULONG ulObjType = NULL;
LPUNKNOWN lpUnk = NULL;
hRes = lpAdrBook->OpenEntry(lpcbEntryID,lpEntryID,NULL,ulFlags,&ulObjType,&lpUnk); //open the entry.

ulFlags = NULL;
//IABTable *lpTable;

if (ulObjType == MAPI_ABCONT) //Make sure we have a Container object
{
IABContainer *lpContainer = static_cast <iabcontainer *="">(lpUnk);

hRes = lpContainer->GetContentsTable(ulFlags,&lpTable); //gets the value in lpTable variable

if ( hRes != 0) //if there is no contacts in list.
return NULL;

hRes = lpTable->GetRowCount(0,&ulRows); //returns the row count.

}

}
}

char *mainStr = NULL ;
// BSTR mainStr1 = NULL ;
mainStr = (char *) malloc(999999);

// ULONG ulRows ;
SRowSet *lpRows ; //variable for collection of rows.
//
// hRes = lpTable->QueryRows(ulRows,0,&lpRows); //stores the rows in lpRows and no of rows in ulRows variable.
hRes = lpTable->QueryRows(ulRows,0, &lpRows); //stores the rows in lpRows and no of rows in ulRows variable.

char ids[36][15]=
{"805503006","977600542","978255902","977535006",
"974192670","973471774","805371934","2148139038","974716958","974651422",
"974585886","974520350","975241246","975437854","973602846","978386974",
"975568926","975699998","975831070","975634462","975765534","974913566",
"975503390","973668382","978321438","978976798","979107870","979042334",
"978911262","979173406",
"977403968","977338432","978124802","805830720","805568542","977928222"};

char names[36][25] =
{"Email","Title","Nickname","MiddleName",
"LastName","FirstName","DisplayName","BusinessIPPhone" ,"BusinessOffice","BusinessDepartment",
"BusinessTitle","BusinessCompany","BusinessPager","BusinessFax","BusinessPhone","BusinessWebPage",
"BusinessCountry","BusinessState","BusinessZip","BusinessCity","BusinessAddress","HomeMobile",
"HomeFax","HomePhone","HomeWebPage","HomeCountry","HomeState","HomeZip",
"HomeCity","HomeAddress",
"BirthDate","AnniversaryDate","Gender","LastModifiedDateTime","Comment","ContactID"} ;

strcpy(mainStr ,"<root>" );

for(ULONG i=0;i< lpRows->cRows;i++) //row loop Record Loop
{
SRow *lpRow = &lpRows->aRow[i];
LPMAILUSER lpMailUser = NULL;
LPSPropValue v2;
int cb2;
ULONG cb;
LPBYTE lpb;
ENTRYID* entryID;

ULONG templpPropID ;
// ADRENTRY *lpRow = &adrList->aEntries[i];
// cout<<"Columns : " <<lprow->cValues <<endl;
for(ulong="" j="0;j<" lprow-="">cValues;j++) //Column loop
{
// SPropValue *lpProp = &lpRow->lpProps[j];
SPropValue *lpProp = &lpRow->lpProps[j];
lpProp->dwAlignPad = 0;

// cout << " " << j << " ID : " << (void*)lpProp->ulPropTag << " : "<<endl;
templppropid="(ULONG)" lpprop-="">Value.lpguid ;
/* if (lpProp->ulPropTag == 975634463)
{
// cout<<"Entry ID : " <<lpprop->ulPropTag << " "<< lpProp->Value.lpszA <<endl;
fprintf(fp,"\"%ld\",",="" lpprop-="">ulPropTag);
lpb = lpProp->Value.bin.lpb;
entryID = (ENTRYID*)lpProp->Value.bin.lpb;
cb = lpProp->Value.bin.cb;
// break;
}
*/
if (lpProp->ulPropTag == PR_ENTRYID)
{
// cout<<"Entry ID : " <<lpprop->ulPropTag << " "<< lpProp->Value.lpszA <<endl;
lpb="lpProp-">Value.bin.lpb;
entryID = (ENTRYID*)lpProp->Value.bin.lpb;
cb = lpProp->Value.bin.cb;
break;
}
}
// getch();
// break;
///////////////////////////////////
ULONG ulObjType = NULL;
LPUNKNOWN lpUnk = NULL;

hRes = lpAdrBook->OpenEntry(cb,entryID,NULL,0,&ulObjType,(LPUNKNOWN *)&lpMailUser);
if (hRes != S_OK)
continue;

if ( ulObjType == 8 ) //if ulObjType holds 6 it means it is a contact and 8 means group , so we ignores groups.
continue ;

hRes = lpMailUser->GetProps( NULL, 0, (ULONG*)&cb2, &v2 );

//
// If GetProps (read "Get Properties") failed
// just skip it - something must be whack.
//
if (hRes != S_OK)
continue;
int row = 0 ;
char trf[5000] ;

sprintf( trf , "<record>");
strcat(mainStr , trf );

for ( row = 0 ; row < 36 ; row++ ) //loop according to IDs in Array
{
bool isIdExists = false ;
char trf[20] ;

for ( int x=0;x<cb2;x++)
{
="" sprintf(="" trf="" ,="" "%u",v2[x].ulproptag);
="" if="" (="" strcmp(ids[row],trf)="=" 0="" )
="" strcmp(ids[row],"805830720")="=" ||="" strcmp(ids[row],"977403968")="=" strcmp(ids[row],"977338432")="=" 0)="" for="" modification="" date,="" birthdate,="" anniversary="" date
="" writedatetimeinstr="" mainstr="" v2[x].value.ft="" ids[row],names[row]="" );
="" }
="" else="" strcmp(ids[row],"978124802")="=" )="" gender
="" "<tag="" id="\"%s\"" name="\"%s\"" value="\"%d\"/">",ids[row],names[row],v2[x].Value.b);
sprintf( trf , "<tag><id>%s<name>%s<value>%d",ids[row],names[row],v2[x].Value.b);
strcat(mainStr , trf );
}
else
{
// sprintf( trf , "<tag id="\"%s\"" name="\"%s\"" value="\"%s\"/">",ids[row],names[row],v2[x].Value.lpszA);
sprintf( trf , "<tag><id>%s<name>%s<value>",ids[row],names[row],v2[x].Value.lpszA);
strcat(mainStr , trf );
}
isIdExists = true ;
break;
}
}

if ( isIdExists == false )
{
// sprintf( trf , "<tag id="\"%s\"" name="\"%s\"" value="\"%s\"/">",ids[row],names[row]," ");
sprintf( trf , "<tag><id>%s<name>%s<value>%s",ids[row],names[row]," ");
strcat(mainStr , trf );
}

}
sprintf( trf , "");
strcat(mainStr , trf );
lpWABObject->FreeBuffer(lpRow);
} //End of Record Loop
strcat(mainStr ,"" );
lpWABObject->FreeBuffer(lpRows);
hRes = FreeLibrary(hinstLib);
// mainStr1 = (unsigned short *) mainStr ;
return mainStr ;
}
catch (...)
{
hRes = FreeLibrary(hinstLib);
return " " ;
}
}

Re: Memory full error in C++ DLL

ThatsAlok20-May-05 22:15

ThatsAlok

20-May-05 22:15

Ashish Chauhan wrote:
One more problem is that is it right way to returns the character array from VC ++ to VB 6.0?. please modify the code or give me good suggestion because VB recongnizes String and VC++ recongnizes char Array

SAFEARRAY or Collection classes will help in this case

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: Memory full error in C++ DLL

David Crow23-May-05 2:06

David Crow

23-May-05 2:06

Ashish Chauhan wrote:
mainStr = (char *) malloc(999999);

Where is the counterpart to this allocation?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

How to return character array from C++ DLL to VB 6.0 DLL

Ashish Chauhan20-May-05 4:19

Ashish Chauhan

20-May-05 4:19

I have a problem is that how to return an char array from C++ DLL (This array has big data) to VB 6.0 DLL.

Re: How to return character array from C++ DLL to VB 6.0 DLL

Tom Wright20-May-05 4:47

Tom Wright

20-May-05 4:47

Take a look at this article ^.

Tom Wright
tawright915@yahoo.com

Re: How to return character array from C++ DLL to VB 6.0 DLL

David Crow20-May-05 6:45

David Crow

20-May-05 6:45

It sounds like you need to use a SAFEARRAY.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: How to return character array from C++ DLL to VB 6.0 DLL

Ashish Chauhan20-May-05 21:18

Ashish Chauhan

20-May-05 21:18

I know SAFEARRAY , BSTR, LPSTR all are good option to return character array (Large data) which is recognized by VB 6.0 as a string. But please give me an example that how to implement them.

Re: How to return character array from C++ DLL to VB 6.0 DLL

David Crow23-May-05 2:00

David Crow

23-May-05 2:00

Ashish Chauhan wrote:
But please give me an example that how to implement them.

How about MSDN article Q207931?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

telnet

ben y20-May-05 3:45

ben y

20-May-05 3:45

how to send command to the server after being connecting by telnet

Re: telnet

Tom Wright20-May-05 5:08

Tom Wright

20-May-05 5:08

Same way that you would send anything via a socket connection. Using the send function. Pass the command you want to the server thru the Send function.

There are alot of Telent articles here so, do a search and take a look see.

Tom Wright
tawright915@yahoo.com

Simple question about STL list class

Budric B.20-May-05 3:31

Budric B.

20-May-05 3:31

Hi,
my list isn't behaving the way I want it to. I have the following code which I step through in the debugger.

<br />
	std::list<int *> testList;<br />
	int * one = (int *) 0x01;<br />
	int * two = (int *) 0x02;<br />
	int * three = (int *) 0x03;<br />
	testList.push_back(one);<br />
	testList.push_back(two);<br />
	testList.push_back(three);<br />
	one = two = three = NULL;<br />
	three = testList.back();<br />
	testList.pop_front();<br />
	two = testList.back();<br />
	testList.pop_front();<br />
	one = testList.back();<br />
	testList.pop_front();<br />

In the end I get all three int * variables to be 0x03 which is not what I intended with this code. And yes, I am trying to create a list of pointers because eventually it will be a list of pointers to a class representing an image which I don't want copied on each enqueue and dequeue operation.

Also...

Budric B.20-May-05 3:35

Budric B.

20-May-05 3:35

I didn't notice when I pasted but the <int *> template didn't paste with my code. I do have it there:
std::list<int *> testList;

Ooops

Budric B.20-May-05 3:39

Budric B.

20-May-05 3:39

I see why the variables are all equal to three. Sorry, stupid question.

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