how to call other dialog box without DoModel function in mfc - C / C++ / MFC Discussion Boards

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Maxwell Chen13-Aug-07 1:15

Maxwell Chen

13-Aug-07 1:15

Did you configure the Project properties for
Linker --> Input --> Additional Dependencies. ?

Maxwell Chen

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Sternocera13-Aug-07 1:17

Sternocera

13-Aug-07 1:17

Yes. I've just added libpqxx.lib, per the instructions in the readme file,
Regards,
Sternocera

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Sternocera13-Aug-07 1:18

Sternocera

13-Aug-07 1:18

The problem is that I cannot link to libpqxx_static.lib/libpqxx_staticD.lib and not to libpqxx.lib/libpqxxD.lib (fatal error LNK1104: cannot open file), and, conversely, I cannot link to libpqxx.lib/libpqxxD.lib and not to libpqxx_static.lib/libpqxx_staticD.lib (fatal error LNK1104: cannot open file).

They are dependent on each other, but prevent each other from working, it would seem!

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Sternocera13-Aug-07 1:29

Sternocera

13-Aug-07 1:29

by apending more input to my additional dependencies (essentially all my libs, both those of the wrapper and the underlieing api), I get the following linker errors:

<br />
1>ibpq.lib(fe-misc.obj) : error LNK2001: unresolved external symbol __imp__select@20<br />
1>libpq.lib(fe-connect.obj) : error LNK2001: unresolved external symbol __imp__WSAGetLastError@0<br />
1>libpq.lib(fe-misc.obj) : error LNK2001: unresolved external symbol __imp__WSAGetLastError@0<br />
<br />
// lots more similar linker errors<br />

What do you think these mean?
Regards,
Sternocera

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Steve S14-Aug-07 2:33

Steve S

14-Aug-07 2:33

That you have not specified ws2_32.lib as a dependency Smile | :)

They are routines from the WinSock library.

Steve S
Developer for hire

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

prasad_som13-Aug-07 1:37

prasad_som

13-Aug-07 1:37

Would you mind modifying your post? it is breaking forum(it is having 2357 lines).

Prasad
MS MVP - VC++

Re: Link2005 error when attempting to build project in visual studio IDE that uses libpqxx C++ wrapper for the libpq C API in visual studio

Sternocera13-Aug-07 1:38

Sternocera

13-Aug-07 1:38

Ok. I've solved the problem anyway - I simply forget to link to the winsock api

how to call other dialog box without DoModel function in mfc

rajneshmalik13-Aug-07 0:48

rajneshmalik

13-Aug-07 0:48

can any body help me

malik

Re: how to call other dialog box without DoModel function in mfc

Paresh Chitte13-Aug-07 0:59

Paresh Chitte

13-Aug-07 0:59

Refer http://msdn2.microsoft.com/en-us/library/yhth57kd(VS.80).aspx[^] to create modeless dialog boxes.

Regards,

Paresh.

Re: how to call other dialog box without DoModel function in mfc

Nishad S13-Aug-07 1:03

Nishad S

13-Aug-07 1:03

Use Create

- NS -

Re: how to call other dialog box without DoModel function in mfc

Hamid_RT13-Aug-07 7:05

Hamid_RT

13-Aug-07 7:05

CreateWindow or CreateDialog or CreateDialogParam are helpful for you.

WhiteSky

whats the result of this ...

dharani13-Aug-07 0:19

dharani

13-Aug-07 0:19

Hi all
I have piece of code like this ...

char* str;
str= new char[30];
str = new char[20];

....

delete str;

Here what will happen ?
To try it , with VS2003 I did not face any memory leaks (Or did I fail to notice it ?)
My question is : When a "new" is called second time to allocate 20 bytes what will happen to the first 30 bytes allocated ?
Will "new" make sure the first 30 bytes are freed ?
I noticed one thing . After the first "new" the location of str was 0x60878776 . After the second "new" the str was pointing to 20 bytes starting from 0x83422323 . Does it mean memory of 0x60878776 is free ?

redindian

Re: whats the result of this ...

Maxwell Chen13-Aug-07 0:26

Maxwell Chen

13-Aug-07 0:26

Let me check where the data is...
But before that, I have to say that your syntax is wrong. It should be:

char* str;<br />
str= new char[30];<br />
str = new char[20];<br />
// ....<br />
delete <big>[]</big> str;

Maxwell Chen

Re: whats the result of this ...

Maxwell Chen13-Aug-07 0:31

Maxwell Chen

13-Aug-07 0:31

Visual C++ 2005 reuses the first address of str where it was allocated.

Maxwell Chen

Re: whats the result of this ...

dharani13-Aug-07 0:39

dharani

13-Aug-07 0:39

So you mean to say in VS2003 or VC++ 6 the first memory block will be still occupied ?

redindian

Re: whats the result of this ...

1slipperyfish13-Aug-07 9:30

1slipperyfish

13-Aug-07 9:30

i would have thought so as you haven't freed it explicitly, or your compiler has done it for you, why don't you put cout << "destructor\n"; in your destructor and see?
paul

if ignorance is bliss then knock the smile off my face!!!

Re: whats the result of this ...

jhwurmbach13-Aug-07 0:39

jhwurmbach

13-Aug-07 0:39

dharani wrote:
When a "new" is called second time to allocate 20 bytes what will happen to the first 30 bytes allocated ?

The allocated memeory will become inaccessible (and thus un-deletable), because you do no longer have a 'handle' to it.

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

Re: whats the result of this ...

dharani13-Aug-07 0:40

dharani

13-Aug-07 0:40

So how to avoid such a scenario ?
I am trying to find answer ... Frown | :(

redindian

Re: whats the result of this ...

jhwurmbach13-Aug-07 0:43

jhwurmbach

13-Aug-07 0:43

dharani wrote:
So how to avoid such a scenario ?

<br />
delete[]

the old memoryadress before reallocating.
Hold the new address in another variable.
Use a string class (e.g. std::string or CString), which handles the memory for you.

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

Re: whats the result of this ...

Paresh Chitte13-Aug-07 0:46

Paresh Chitte

13-Aug-07 0:46