C / C++ / MFC

26-Oct-10 22:36

You probably need a library for the purpose (the other route would be reading the PDF specifications for implementing the decoding algorithm).
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

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[My articles]

CFileDialog

MsmVc26-Oct-10 21:36

MsmVc

26-Oct-10 21:36

Hi all

How can i use FilterIndex in CFileDialog?
Please help me

Re: CFileDialog

CPallini26-Oct-10 21:55

How to reset the Combo Box to previous selection [modified]

26-Oct-10 21:55

MsmVc wrote:
How can i use FilterIndex in CFileDialog?

As specified by the documentation. MSDN gives even this sample code.
Smile | :)

msr_codeproject26-Oct-10 19:36

msr_codeproject

26-Oct-10 19:36

Hi, I have a combo box in my application.

Whenever there is CB_SELCHANGE occurs, I need to perform some operation.
If the operation fails I need to reset the combo box to previous value.

My Trail:

Whenever there is a change in selection I am copying that item to a string variable (say str).
Now I am using CB_FINDSTRING to get the index using str by calling SendMessage. But it was not working.

I have confusion with LPARAM and WPARAM in SendMessage. Please give me the syntax of SendMessage
using CB_FINDSTRING.

Can you people throw me some idea?

Thanks in advance
msr

modified on Wednesday, October 27, 2010 1:43 AM

Re: How to reset the Combo Box to previous selection

CPallini26-Oct-10 21:50

Re: How to reset the Combo Box to previous selection

26-Oct-10 21:50

A bit of book-keeping would avoid the SendMessage stuff.
Anyway you probably have to write something like (assuming your str is a char*):

LRESULT result = SendMessage(hWnd, CB_FINDSTRING, (WPARAM)-1, (LPARAM)str);

msr_codeproject26-Oct-10 22:09

msr_codeproject

26-Oct-10 22:09

Thank you. Now it is working. I have interchanged LPARAM and WPARAM parameters. Here is my code.

DWORD GetComboBoxIndex = 0;
GetComboBoxIndex = SendMessage(hWnd, CB_FINDSTRINGEXACT, -1, (LPARAM)str);
SendMessage(hWnd, CB_SETCURSEL, GetComboBoxIndex, NULL);

Regards
msr

Re: How to reset the Combo Box to previous selection

CPallini26-Oct-10 22:18

Error Heap in allocate modeless .

26-Oct-10 22:18

You are welcome.
Smile | :)

HTT9026-Oct-10 7:32

26-Oct-10 7:32

I have the code about create many modeless dialog .

for(int i=0;i < 5;++i)
    {   
        pRegionDlg[i] = new CRegionDlg ( this );
        pRegionDlg[i]->Create( IDD_DIALOG , this );
        pRegionDlg[i]->ShowWindow( SW_SHOW ) ;
    }

this code is error heap . but I don't understand why it's error . while this code can run good on other program .

Thanks for reading and helping .

David Crow26-Oct-10 7:51

David Crow

26-Oct-10 7:51

HTT90 wrote:
this code is error heap . but I don't understand why it's error . while this code can run good on other program .

What is this supposed to mean? What error? Where? How was pRegionDlg declared? Please clarify.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

CPallini26-Oct-10 9:30

26-Oct-10 9:30

Maybe 'the other program' properly allocates the pRegionDlg array.
Smile | :)

HTT9026-Oct-10 16:21

26-Oct-10 16:21

I did :

in header file :

CRegionDlg *pRegionDlg[8] ;

and when I debug , I receive a message , it's inform me no loaded from dll . and heap is error .

CPallini26-Oct-10 21:21

26-Oct-10 21:21

Please don't define arrays in header files.
Please report full error message.
Smile | :)

HTT9026-Oct-10 22:03

26-Oct-10 22:03

I don't know why now it's run good and no error . Frown | :(

.
Can You say why don't define arrays in header files ?
I'm chicken . Smile | :)

CPallini26-Oct-10 22:17

26-Oct-10 22:17

You should never define variables inside header files (headers are for declarations), because you may get multiple definitions of the same symbol (if, as usual, the header is included by many sources).
If you need to access a variable from multiple sources then you have to:

Declare it as extern inside an header file.
Define it inside just one source file.
Include the header file into every source that needs to access the variable itself.

HTT9026-Oct-10 22:42

char *> string conversion , env[]

26-Oct-10 22:42

Thanks .

ALLERSLIT26-Oct-10 7:12

ALLERSLIT

26-Oct-10 7:12

Hey,
Iam reading this book and Iam writing my own program aside.
Iam currently reading about some functions related to linux.

#include <stdio.h>
#include <iostream>

using namespace std;

int main(int argc,char *env[])
{
int i=0;
cout << env[i] << endl;
return 0;
}

This is the program, now how would I actually put the output of env[i] into a string?

In my own program Iam playing around with conversions and string editing and stuff, now I need to convert the output of env[i] into a string though, not sure how to do that.
Thankfull for any help, greetins Smile | :)

David Crow26-Oct-10 7:22

David Crow

26-Oct-10 7:22

ALLERSLIT wrote:
int main(int argc,char *env[])

This should probably be:

int main( int argc, char *argv[], char *env[] )

ALLERSLIT wrote:
how would I actually put the output of env[i] into a string?

Have you tried:

std::string str = env[i];

ALLERSLIT26-Oct-10 7:38

ALLERSLIT

26-Oct-10 7:38

Oh thanks, gotcha!

let's say I wouldn't put

char *env[]

there into the main() thingy, how would I be able to get the output of env[i] then?
Like

#include <stdio.h>
#include <iostream>
#include <string>

using namespace std;

int main()
{
char *env[];
string str = env[9];
cout << str << endl;
return 0;
}

I get this error: |14|error: storage size of ‘env’ isn't known
Makes sense to me, but how would I avoid that error?

David Crow26-Oct-10 7:46

David Crow

26-Oct-10 7:46

ALLERSLIT wrote:
Makes sense to me, but how would I avoid that error?

By declaring env as:

char *env[10];