C / C++ / MFC Discussion Boards

Re: Non-rectangular client area [modified]

rnendel1-Feb-10 6:06

1-Feb-10 6:06

Yes, I just did it.&nbsp;&nbsp; The concept is fairly easy to implement if you are managing your own custom container control ( which I'm fairly certain is what you are doing based on the thread ).

To implement this; however, you need to use only custom child controls or child controls that have OnPaint() overridden so that you can interject a clipping region prior to the child control being rendered.

1. In your custom container control, in the OnPaint() event, calculate the desired client area GraphicsPath.&nbsp;&nbsp; Save that path as a public member for later use by chlid controls, let's name it 'ClientAreaPath' for fun.

2. For any control that can be added to your custom container, define the control as a custom control, or at least inherit and override the OnPaint() event.

3. In your child controls, in the OnPaint() override, determine if the control is a child of your custom container and, if so, then transform and apply the ClientAreaPath that was calculated and saved in step #1 above.&nbsp;&nbsp; Viola - non-rectangular clipping Smile | :)

Here's a rough c# outline of the child control OnPaint() operations.

public override void OnPaint( PaintEventArgs e )
{
   // determine if this control is parented and if the parent can supply a ClientAreaPath
   try
   {
         // attempt to cast, will cause exception if nothing else
         MyCustomContainer parentContainer = ( MyCustomContainer )Parent;

         // get a copy of the custom client path
         GraphicsPath p = new GraphicsPath(parentContainer.ChildPath.PathPoints, parentContainer.ChildPath.PathTypes);

         // transfrom the path to be relative to the client (critical step here)
         // all paths are "zero-relative" so the client needs to see this path expressed
         // not as zero-relative, but client-location relative instead
         Matrix translateMatrix = new Matrix();
         translateMatrix.Translate(-(Location.X), -(Location.Y));
         p.Transform(translateMatrix);

         // now apply a nice clipping region to the control's graphics object so that
         // all subsequent render related operations will clip appropritely
         e.Graphics.SetClip( p );
   }
   catch( &lt;bleh&gt; )
   {
   }

   // ******* now render your control using whatever means you want, just make sure that
   // you do not reset the clipping path - if you need to clip additional client-relative
   // areas, use a clipping combine mode of compliment ( or whatever that option is )
}

Hope this helps Smile | :)

Of course, based on the date of the post ( 3 years ago ), probably not LOL.

modified on Monday, February 1, 2010 12:32 PM

Re: Non-rectangular client area

Nishad S1-Feb-10 13:36

Nishad S

1-Feb-10 13:36

rnendel wrote:
Hope this helps Of course, based on the date of the post ( 3 years ago ), probably not LOL.

This solution was not applicable (at that time) I think... Smile | :)

- ns ami -

request time out

neha.agarwal279-Oct-07 22:20

neha.agarwal27

9-Oct-07 22:20

Hello all,

I have written a code for getting html code of any given link using api's .
Now what i want is when a particular page is taking more then 10 sec to get its html code a message box stating time out should be displayed. How can i do this?

Thanks in advance

Re: request time out

Nelek9-Oct-07 22:24

Nelek

9-Oct-07 22:24

You can use SetTimer (...) when the function to get the code starts, and KillTimer (...) when the function ends succesfully with the download of the code.

If the timer reachs the end of the interval, then you can code you dialogbox with the error in the message WM_TIMER.

hope it helps

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: request time out

neha.agarwal2710-Oct-07 23:50

neha.agarwal27

10-Oct-07 23:50

SetTimer is a function in CWnd class and i am doing all my processing in a worker thread. How to apply this functionality in a thread

Re: request time out

Nelek29-Oct-07 22:15

Nelek

29-Oct-07 22:15

can sleep maybe help?

DLL Information

Sunil Bhaskar9-Oct-07 21:56

Sunil Bhaskar

9-Oct-07 21:56

Hi,

I have a third party dll and a lib file. Now i want to check whether the lib file and the dll have been built using the same .obj files or not?

Is there any tool or utility which can give me the names of the .obj files used in building the correspinding dll.

For .lib files we can use the lib.exe utility which comes with visual studio.

Any help will be great.

Desktop Changed Information

ashishbhatt9-Oct-07 21:50

ashishbhatt

9-Oct-07 21:50

Hello All,

I want to know that my desktop is changed or not ??

I want the message handler that will inform my application that my desktop is changed.

I want to continuesly check that my desktop changing information.

I want that specific changed rectangle from the desktop.

Thanks in Advance,

Ashish

Re: Desktop Changed Information

David Crow11-Oct-07 2:56

David Crow

11-Oct-07 2:56

ashishbhatt wrote:
I want to know that my desktop is changed or not ??

See if WM_SETTINGCHANGE is of any help?

ashishbhatt wrote:
I want that specific changed rectangle from the desktop.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Why the type conversion is needed?

LiYS9-Oct-07 21:37

LiYS

9-Oct-07 21:37

Hi all:

I'm wondering why the following code need type conversion from PVOID to PBYTE, is it because of the type of "Size"? and why PBYTE, will any other type will do the same thing?

PVOID pvAddressBlk;
SIZE_T RegionSize;
pvAddressBlk = (PVOID) ((PBYTE) pvAddressBlk + Size);

Thanks,

Re: Why the type conversion is needed?

Cedric Moonen9-Oct-07 21:44

Cedric Moonen

9-Oct-07 21:44

Because you are doing pointers arithmetics here. A PVOID pointer is a pointer to an unknown type (so, which size is not known). In that case, you cannot increment the pointer because the size to which it points to is unknown (so, impossible to go to the next element). A pointer to a byte (PBYTE) knows the size to which it points to (1 byte), so incrementing the pointer will move to the next byte.

Similarly, if you casted your pointer to int* for example, then incrementing (++) the pointer would make it points 4 bytes after its current position (because the size of an int is 4 bytes, so, the next integer is 4 bytes after the current position).

Hope it is clear.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: Why the type conversion is needed?

LiYS9-Oct-07 22:06

LiYS

9-Oct-07 22:06

Thanks for the reply, the code makes sense to me now: it's trying to increment the address by (type size * n) bytes.

Re: Why the type conversion is needed?

Naveen9-Oct-07 21:48

Naveen

9-Oct-07 21:48

LiYS wrote:
is it because of the type of "Size"?

No. Let me explain with an example. Suppose you have two pointer variables say

int *pInt and <br />
char *pchar

And you increament both this varibales by one

pInt++;<br />
pChar++;

In the above case the pInt will increament by four. But pChar will be advanced by only one.( i. e when a pointer is increamented or added for n times, compiler actually adds n times the size of datatype the pointer pointing to )

In your case it is a void* pointer. So it cannot decide how much to increment. thats why compiler gives the error.

nave

[OpenedFileFinder]

Re: Why the type conversion is needed?

LiYS9-Oct-07 22:06

LiYS

9-Oct-07 22:06

Thanks for the reply, the code makes sense to me now!

InternetFindNextFile function falis

onlyjaypatel9-Oct-07 19:50

onlyjaypatel

9-Oct-07 19:50

I want all the filenames in perticular folder of web server
with http call.

InternetFindNextFile function falis

some sample of code.
.
.

CString sUserAgentName = "Microsoft Internet Explorer";

DWORD dwAccessType = INTERNET_OPEN_TYPE_PRECONFIG ;

DWORD dwFlags =INTERNET_FLAG_DONT_CACHE|INTERNET_FLAG_RELOAD ;

//pInternetSession = new CInternetSession(sUserAgentName,dwContext,dwAccessType,NULL,NULL,dwFlags);

CString sUrl="http://www.test.com/1";
WIN32_FIND_DATA wfd;
HINTERNET hInternetFind,hInternetOpen = InternetOpen(sUserAgentName,dwAccessType,NULL,NULL,0);
CStringArray saFileName, saDirectoryName;
CString sName;

CString sServerName , sServerObjectName ;

DWORD dwServiceType = 0 ;

INTERNET_PORT nServerPort = 0;

CString strHeaders ;

CString sUserName = "";

CString sPassword ;

DWORD dwContext = 0;

if(AfxParseURL(sUrl,dwServiceType,sServerName,sServerObjectName,nServerPort)==FALSE)
{
AfxMessageBox("AfxParseURL() Fails");
return false;
}
int err;

//pConnection = pInternetSession->GetHttpConnection(sServerName,nServerPort,sUserName,sPassword);

//HINTERNET hInternetConnect =

::InternetConnect(hInternetOpen,sServerName,nServerPort,sUserName,sPassword,INTERNET_SERVICE_HTTP,dwFlags,dwContext);

//err = GetLastError();

//hInternetFind = FtpFindFirstFile(hInternetConnect,"*.*",&wfd,0,0);
/*if i try function FtpFindFirstFile than it returns null and errorcode is

ERROR_INTERNET_INCORRECT_HANDLE_TYPE(12018)
*/

//err = GetLastError();

hInternetFind = InternetOpenUrl(hInternetOpen,sUrl,NULL,0,INTERNET_FLAG_RAW_DATA| INTERNET_FLAG_RELOAD|
INTERNET_FLAG_DONT_CACHE,0);
/* if i try InternetOpenUrl than it retrn not null but when InternetFindNextFile is called than it returns FALSE
ERROR_INTERNET_INVALID_OPERATION(12016)*/

err = GetLastError();

if (hInternetFind ==NULL)
{
AfxMessageBox("(hInternetFind == NULL)");
}

if (InternetFindNextFile(hInternetFind, &wfd) == FALSE)
{
err = GetLastError();
AfxMessageBox("(InternetFindNextFile = fails)");
}
do
{
if(wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
sName = (const char*) &wfd.cFileName;
if(!sName.IsEmpty())
{
if (sName.GetAt(0) == '.')
continue;
saDirectoryName.Add(sName);
}

}
else
saFileName.Add(sName);

}
while (InternetFindNextFile (hInternetFind, &wfd));
InternetCloseHandle(hInternetFind);
.
.
.

Rose | [Rose]

thanx

Re: InternetFindNextFile function falis

David Crow10-Oct-07 2:57

David Crow

10-Oct-07 2:57

jay_p_patel wrote:
InternetFindNextFile function falis

So what does GetLastError() return?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: InternetFindNextFile function falis

onlyjaypatel10-Oct-07 19:11

onlyjaypatel

10-Oct-07 19:11

i wrote in that code
ERROR_INTERNET_INVALID_OPERATION(12016)

Re: InternetFindNextFile function falis

David Crow11-Oct-07 2:52

David Crow

11-Oct-07 2:52

Your code snippet is next to impossible to read. I can't tell what you've got commented out and what's actual code. Please reformat it AND make use of the <pre> tags.

You need something similar to:

HINTERNET hOpen = InternetOpen(...);
if (hOpen != NULL)
{
    HINTERNET hConnect = InternetConnect(hOpen, ...);
    if (hConnect != NULL)
    {
        WIN32_FIND_DATA findData;
        
        HINTERNET hFind = FtpFindFirstFile(hConnect, NULL, &findData, ...);
        if (hFind != NULL)
        {
            do
            {
                ...
            } while (InternetFindNextFile(hFind, &findData))
        }
    }
}

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: InternetFindNextFile function falis

onlyjaypatel16-Oct-07 20:53

onlyjaypatel

16-Oct-07 20:53

Hello Sir,

The code you send me that i already tried.
when i use
HINTERNET hFind = FtpFindFirstFile(hConnect, NULL, &findData, ...);
it returns hFind = NULL
and in GetLastError it returns
Error No.12018 ERROR_INTERNET_INCORRECT_HANDLE_TYPE

i read in msdn that we can use InternetOpenUrl in place of FtpFindFirstFile
HINTERNET hFind = InternetOpenUrlhInternetOpen,sUrl,NULL,0,INTERNET_FLAG_RAW_DATA| INTERNET_FLAG_RELOAD|
INTERNET_FLAG_DONT_CACHE,0);

now hFind is not Null but when i use this hFind in
InternetFindNextFile API than it return false.
So this is the problem.

Anyway thanx for helping me.
sorry for ur inconvinience.
Smile | :)

Where is the first data location in Monochrome BMP image?

Mohammad Khodaea9-Oct-07 19:24

Mohammad Khodaea

9-Oct-07 19:24

Hi dear
I want to ask you if you know where the first address for image data in monochrome bitmap is. I know the header allocate 54 bytes but I am not sure about this in Monochrome images.
Please if you can tell me where is the location of the first data, I will be so thankful.
Note: Monochrome Bitmaps (one bit per pixel)
Thanks Confused | :confused:

Re: Where is the first data location in Monochrome BMP image?

Nishad S9-Oct-07 19:48

Nishad S

9-Oct-07 19:48

The image data address is stored in the image header itself. So better you read it and check. I think you are not considering color table info.

- NS -

Re: Where is the first data location in Monochrome BMP image?

Mark Salsbery10-Oct-07 6:19

Mark Salsbery

10-Oct-07 6:19

I answered this before for you and you still haven't provided enough information.

If the BMP is a file, the file begins with a BITMAPFILEHEADER structure.
The bfOffBits member of this struct is the offset of the pixel bits from the
beginning of the file.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Read stream of bytes in a buffer as a String [modified]

CodingLover9-Oct-07 18:40

CodingLover

9-Oct-07 18:40

Hi all, here's my question.

First I read a binary file, which includes large number of streams of bytes. Each stream has specific details. Using a buffer I read each stream and extract some details. Actually stream consist two parts, fixed data and a message. Fixed data length actually fixed in 24 number of bytes. Rest of the bytes include the message. What I want to do is, read the bytes which message include and print as a String(actually as a message).

Those bytes are in the buffer and I know how many bytes are there.

I work on Visual Studio .Net 2003

Can you guys help me to solve this.

Thanks Smile | :)

-- modified at 0:45 Wednesday 10th October, 2007 -- adding more details

Hi all....

Re: Read stream of bytes in a buffer as a String

chandu0049-Oct-07 18:57

chandu004

9-Oct-07 18:57

Eranga Thennakoon wrote:
What I want to do is, read the bytes which message include and print as a String(actually as a message).

this sentence is not clear can you just elaborate it?

Re: Read stream of bytes in a buffer as a String [modified]

CodingLover9-Oct-07 19:05

CodingLover

9-Oct-07 19:05

Ok, after reading each stream I've found that number of bytes which include the message of each and every stream separately. As a example,

stream 1 - message use 4 bytes
stream 2 - message use 1500 bytes
stream 3 - message use 100 bytes
etc..

Right now all those bytes are in a buffer. What I want to do is read that bytes in the buffer and find the message there, I mean read stream 1 bytes of 4 and find the message. Then read the stream 2 bytes of 1500 and find the message and so on

I think it is clear now. Smile | :)

-- modified at 1:10 Wednesday 10th October, 2007

I appreciate your help all the time...

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.