C / C++ / MFC

19-Mar-02 4:20

You need a bitmap associated with memory DC. Search CodeProject for CMemDC class - it'll do the boring stuff for you.

Tomasz Sowinski -- http://www.shooltz.com

Window Repainting

#realJSOP19-Mar-02 4:07

#realJSOP

19-Mar-02 4:07

I have a weird little problem, and I think it's associated with DirectShow.

I have an app that creates a CView-based window, and passes the hwnd to a DLL. The hwnd allows me to "attach" (don't know a better word at the moment) a live video preview to the window that was created in the app.

When I move the child window/view around in the app's window, everything is fine - the window always repaints itself. However, if I move the window so that a portion of the client rect is clipped by the app window, when I move the child completely back onto the app window, the portion that *was* clipped does not repaint itself.

I tried various API calls (MoveWindow, SetWindowPos, UpdateWindow, InvalidateRect, and RedrawWindow), but to no avail.

Thinking the problem might be one of timing (a message was getting lost/ignored somehow), I put Sleep(1000); in the code just before my rectangle update. This caused the window to repaint itself correctly at first, but then after the one-second delay, *my* repaint occurred, and the portion that was previously out of view repainted as black.

As an afterthought, I decided to just comment out the contents of my dll window repainting function, and exactly the same thing happens, so I know it's not my code that's causing this.

Does anyone have any words of wisdom?

PS. Both the app and the DLL use MFC, and I cannot add additional parameters that can be passed to the DLL from the app (architectural restriction, not mine).

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: Window Repainting

Tomasz Sowinski19-Mar-02 4:35

changing an application's shell icon

19-Mar-02 4:35

Does it still happen when you leave CYourView::OnDraw empty?

Tomasz Sowinski -- http://www.shooltz.com

Re: Window Repainting

#realJSOP19-Mar-02 5:11

#realJSOP

19-Mar-02 5:11

I found the problem. I had to add the style WS_CLIPCHILDREN to the view in OnPrecreateWindow().

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Chris Hambleton19-Mar-02 3:45

Chris Hambleton

19-Mar-02 3:45

Hi,

I've created an application in which I want to change the menu, accelerators, toolbars, etc dependent on a particular license file. This all works fine, except I don't see how to change the icon that shows up in the shell for the application.

I can easily change the icon in the app's caption/title bar, but not the the icon for the app that would show up on the Windows Desktop or in Windows Explorer.

Any ideas on how / if I can do this?

Thanks!

Re: changing an application's shell icon

Tomasz Sowinski19-Mar-02 3:50

Re: changing an application's shell icon

19-Mar-02 3:50

AFAIR, the shell just grabs first icon it founds in resources embedded in .exe.

Tomasz Sowinski -- http://www.shooltz.com

Chris Hambleton19-Mar-02 4:12

Chris Hambleton

19-Mar-02 4:12

Thanks for your reply -- that makes sense about what icon the shell grabs.

However, is there any way to change which icon is displayed through the shell (like after the first time the app is run)?

Re: changing an application's shell icon

Tomasz Sowinski19-Mar-02 4:24

19-Mar-02 4:24

Chris Hambleton wrote:
However, is there any way to change which icon is displayed through the shell

Shell grabs *and* displays first icon in .exe. What do you mean by 'like after the first time the app is run'? App only registers its file types, not the .exe icon itself.

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 3:45

19-Mar-02 3:45

Insert this before #including Windows headers

#define WINVER 0x0500

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 4:02

19-Mar-02 4:02

No. In your program #define WINVER before including windows headers.

#define WINVER 0x0500
#include <windows.h>

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 4:31

19-Mar-02 4:31

Use 'Find in Files' command to search for COMBOBOXINFO identifier in your include directory. If it's not there, you'll need to download recent Platform SDK from msdn.microsoft.com.

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 4:43

19-Mar-02 4:43

Set the cursor at tagCOMBOBOXINFO, then press Ctrl+J. You'll probably see this line:

#ifndef NOWINABLE

Then press Ctrl+J again. On my workstation it goes to the following line:

#if(WINVER >= 0x0500)

What's displayed on your screen?

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 4:48

19-Mar-02 4:48

Post the #define WINVER and #includes. You've screwed something - maybe WINVER is #defined too late.

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski19-Mar-02 4:53

Re: help needed on arrays

19-Mar-02 4:53

Move #define WINVER 0x0500 into stdafx.h. It must be placed before #includes.

Tomasz Sowinski -- http://www.shooltz.com

help needed on arrays

Jasmin Khan19-Mar-02 3:16

Jasmin Khan

19-Mar-02 3:16

Hi,
Dose any body know how to use arrays?. im trying to put the following in a array. I need help on the code to store it and use it when needed
thankyou
- - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
B - B C D E F G H I J K L M N O P Q R S T U V W X Y Z A
C - C D E F G H I J K L M N O P Q R S T U V W X Y Z A B
D - D E F G H I J K L M N O P Q R S T U V W X Y Z A B C
E - E F G H I J K L M N O P Q R S T U V W X Y Z A B C D
.
.
. (and so on)
.
.
X - X Y Z A B C D E F G H I J K L M N O P Q R S T U V W
Y - Y Z A B C D E F G H I J K L M N O P Q R S T U V W X
Z - Z A B C D E F G H I J K L M N O P Q R S T U V W X Y

Blush | :O

RalfPeter19-Mar-02 3:35

RalfPeter

19-Mar-02 3:35

I'm not sure I understand the question. Here's one way to store and print your array:

void printArray(char *array);

int main(void) {
char array[] = {'-','-','A',...,'Z'};//enter all letters of the alphabet

printArray(array);

return 0;
}

void printArray(char *array){
//code to print it in whatever format you need
}

ralf.riedel@usm.edu

Re: help needed on arrays

Jasmin Khan19-Mar-02 4:02

Jasmin Khan

19-Mar-02 4:02

im trying to create an Vigenere cipher demo.
It basically needs the alpabetbet grid to encrypt data.
There for the grid must be stored in a way in which it is possible to read up/down the column and row to get the chipertext.
i could do with any help on the code
thankyou

x-axiz Keyword: RELAT IONSR ELATI ONSRE LATIO NSREL
y-axis Plaintext: TOBEO RNOTT OBETH ATIST HEQUE STION
Ciphertext: KSMEH ZBBLK SMEMP OGAJX SEJCS FLZSY

Re: help needed on arrays

Jon Hulatt19-Mar-02 5:58

Jon Hulatt

19-Mar-02 5:58

You can do a Vigniere cipher much easier than that. You don't need an array.

a character in C is simply an 8 bit number. eg, the letter 'A' is value 65. 'B' is 66 etc.

You can use single characters and numbers interchangeably.

eg. char MyNumber = 'A'; // MyNumber contains 65.

To this end, you can encipher characters just by adding or subtracting an offset to them.

Try this:

char message[]="This is the plaintext";
int shift=5;

cout << "Plaintext: " << message << "\n";

for (int i=0; i < strlen(plaintext); i++)
{
  *message[i] += shift;
}


cout << "Ciphertext: " << message << "\n";

That should give you a good start.

Jon

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Visual C++ class view

Gutner19-Mar-02 1:52

Gutner

19-Mar-02 1:52

The file names in my Visual C++ project have
extensions of "cc" and "hh" ( not the standard cpp and h ).
Class view does not work when these extensions are used.
How can I keep these extensions and make class view work properly?

Shai Gutner
shai.gutner@schema.com
www.schema.com

Mazdak19-Mar-02 2:08

Mazdak

19-Mar-02 2:08

Did you add them dynamicly to class view?

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Gutner19-Mar-02 2:24

Gutner

19-Mar-02 2:24

I did not add anything to class view.
I created the project from .cc and .hh files.
As far as I know, the class view should work automatically.

Shai Gutner
shai.gutner@schema.com
www.schema.com

Mazdak19-Mar-02 2:47

Mazdak

19-Mar-02 2:47

Gutner wrote:
I did not add anything to class view.

So when it doesn't do it.do it by hand.

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Gutner19-Mar-02 3:08

Gutner

19-Mar-02 3:08

What do you mean "by hand"?
Is there a way to perform it automatically?

Shai Gutner
shai.gutner@schema.com

Tomasz Sowinski19-Mar-02 3:10

19-Mar-02 3:10

COuld you at least think twice before posting? You can't add anything to ClassView - it's generated automatically.

Tomasz Sowinski -- http://www.shooltz.com