CreateCompatibleBitmap and mem allocation - C / C++ / MFC Discussion Boards

Re: How do i know when the mouse leaves an area?

toxcct14-Jun-04 11:23

toxcct

14-Jun-04 11:23

have a look at this[^], it can be very interesting for you...

TOXCCT >>> GEII power

Re: How do i know when the mouse leaves an area?

kfaday14-Jun-04 11:59

kfaday

14-Jun-04 11:59

i've solved it with:

ClientToScreen(&this->m_RectArea);
ClipCursor(this->m_RectArea);

Now, how do i unclip the cursor?

Those lines are in OMouseMove, while the lbutton is clicked.
I want to unclip it in OnLButtonUp

how could i do it?
thanks!

Re: How do i know when the mouse leaves an area?

toxcct14-Jun-04 20:46

toxcct

14-Jun-04 20:46

set a flag (a bool) into your class for example.
otherwise, i don't really understand... sorry...

TOXCCT >>> GEII power

Re: How do i know when the mouse leaves an area?

kfaday15-Jun-04 8:12

kfaday

15-Jun-04 8:12

With ClipCursor(Rect); , the mouse is trapped in that rect.
what should i call if i want the mouse to be free!.. so that i can move it over all the screen of my monitor?
something like ClipCursor(desktop) or something like that?

Re: How do i know when the mouse leaves an area?

kfaday15-Jun-04 9:19

kfaday

15-Jun-04 9:19

ClipCursor(NULL) did the job
thanks for reading the question!

Re: How do i know when the mouse leaves an area?

toxcct15-Jun-04 9:20

toxcct

15-Jun-04 9:20

TOXCCT >>> GEII power

How do i know when the mouse leaves an area?

kfaday14-Jun-04 8:46

kfaday

14-Jun-04 8:46

Hi, i'm drawing in a 'CWnd derived' custom control. I want to know which message handles the following event:
When i'm moving the mouse over the control i click the button to insert points over a list. How do i know, when i'm still clicking the left mouse button, that the mouse has 'left' the area. I'm still clicking, but outside the area.
I want to know that, because when you stop clicking the mouse button, a cpoint -1,-1 is sent to the list, so a lineTo isn't drawn to that point.
I get the rect with Getclientrect, but i can't validate with that.
any ideas?

thanks!!

CreateCompatibleBitmap and mem allocation

IGeorgeI14-Jun-04 8:46

IGeorgeI

14-Jun-04 8:46

Hello everyone

I am using CreateCompatibleBitmap to create bitmaps of my list of worksheets. The problem is, when I hit around 20 bitmaps in a loop, the CreateCompatibleBitmap call begins to fail. I have traced into the MFC function calls and I discovered that the memory allocation on the HEAP has reached its limit for creating more resources.

Has anybody ever seen this before??

If not, does anybody have any suggestions??

Thank you for you help

IGeorgeI

George W

Software Developer
www.zsystems.ca

Re: CreateCompatibleBitmap and mem allocation

Johan Rosengren14-Jun-04 9:14

Johan Rosengren

14-Jun-04 9:14

I've seen it when the bitmaps are very large, or leaked. I would try to structure the code so that I didn't need more than one bitmap at any given time, making sure to properly deselect them from any CDC , if appropriate. And, of course, calling DeleteObject , either directly or by having the dtor of the CBitmap invoked.

Re: CreateCompatibleBitmap and mem allocation

Vadim Tabakman14-Jun-04 16:59

Vadim Tabakman

14-Jun-04 16:59

How big are the bitmap sizes?
I used CreateCompatibleBitmap often in code I work with, and have not come across this issue. I very interested in what the bitmap sizes are, that cause the heap to fill up.

thanx

Sending small strings through sockets (lag problem)

kfaday14-Jun-04 7:44

kfaday

14-Jun-04 7:44

Hello.
I'm doing a small drawing application, which is multi-client.
I've implemented a pen. When you press the button and keep the mouse pressed you insert CPoints in a list, and i create a string with the points and send it with the socket.
The problem is, that i'm sending many points a second (i send in OnMouseMove) and the other user receives them, but sometimes not in order.
For example i send a,b,c,d,e,f and the user receives a,b,d,c,e,f.
How could i solve that? i tought of a buffer of ten points, so when ten points are written, a string with points is sent, to avoid the order problem.
i am sure somebody has had this problem before (or something similar).. what could i do?

thanks!!!

Re: Sending small strings through sockets (lag problem)

Ravi Bhavnani14-Jun-04 8:58

Ravi Bhavnani

14-Jun-04 8:58

I suggest sending the array of points when the user releases the mouse.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Sending small strings through sockets (lag problem)

gamitech14-Jun-04 9:10

gamitech

14-Jun-04 9:10

My suggestion would be this:

try to monitor the sent string and when the client reveives something just send it back and check what he has reveived. If it is the correct string pass on to the next if not send the client a string telling him that he should wait for another string.
This might make even more lag but at least you will know you got it right.

gabby

Re: Sending small strings through sockets (lag problem)

kfaday14-Jun-04 9:32

kfaday

14-Jun-04 9:32

well, i should have explained the scenario better. It's a jabber client, something like msn messenger. I send the strings to the server, and the server sends the strings to the other client.
that's why i have the order problem. Every point is sent, so there are no errors when i send them.

javi's idea is fine i think.

How to capture "network cable unplugged" event

bikram singh14-Jun-04 7:43

bikram singh

14-Jun-04 7:43

Is it possible to capture the "network cable unplugged" event that appears in a balloon tip on the notification area in Windows NT 5+?

I tried by making a thread to monitor the appearance of the balloon, but I cant get it to work.

Is there a better way of doing this??

Bikram Singh

Re: How to capture "network cable unplugged" event

David Crow14-Jun-04 8:49

David Crow

14-Jun-04 8:49

Rather than bother with a tooltip that may or not may not be available, go directly to the source.

On a WAN (e.g., VPN), you can use SENS, specifically the ISensNetwork interface. If it is a LAN, you'd need to use WSAIoctl(SIO_ADDRESS_LIST_CHANGE).

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: How to capture "network cable unplugged" event

bikram singh15-Jun-04 6:37

bikram singh

15-Jun-04 6:37

Thanks !

I managed to get it working, by using IP Helper functions.

I dont understand COM sinks very well, so I'm avoiding ISensNetwork for now... Smile | :)

Bikram Singh

NT Windows Service in C++ to call a SQL Server Stored Procedure

Anand Sundaram14-Jun-04 6:56

Anand Sundaram

14-Jun-04 6:56

Hello Everyone

I am trying to automate a database update (that involves some business logic) using a windows service. The constraints are that
1. I cannot write the service in .NET
Hence I opted to write the service as a C++ executable.

In the service, I have a call using ODBC API (ExecuteSQL method) to a SQL Server Stored procedure just before the call to Sleep method.

The problem is that the call to the stored proc to be executed does NOT work. But the Service installs/uninstalls/starts/stops fine.

If I strip off the code for the service and just run the ODBC part of it, it works fine.

I would like to know if there are issues that need to be taken into account if I make a ODBC call in an NT Service.

I will greatly appreciate any inputs on this.

Thanks
Anand

Re: NT Windows Service in C++ to call a SQL Server Stored Procedure

Xiangyang Liu 刘向阳14-Jun-04 7:05

Xiangyang Liu 刘向阳

14-Jun-04 7:05

By default, a windows service is using the "local system" account, which does not have access to user settings (registry keys, odbc data sources, etc.). It is likely that your odbc data source is a "user" source instead of a "system" source. You need to configure it to "system" data source and you probably have to reboot the machine afterwards.

Good luck.

My articles and software tools

Stored Procedure Concept

Sridhar Sanikommu14-Jun-04 6:44

Sridhar Sanikommu

14-Jun-04 6:44

Hi All,

Need help regarding stored procedure concept using CDatabase & Crecordset database classes. I am working on MFC
application which supports all major RDBMS databases(SQL Server, MySQL, Oracle & MS-Access). I have to process thousands of records from a file and do insert operations.

Right now, this is what I am doing

1. Read one record from a file. Parse it and prepare query.
2. Executing it by using cDatabase's ExecuteSql() function.

But it is taking very long time to process thousand's of records. Every time database has to process the query and prepare an execution plan. That's the reason why I need to solve this problem by using stored procedures which should work with all the databases.

I appreciate if someone could help me in this regard.

Thanks,
Sridhar

Re: Stored Procedure Concept

David Crow14-Jun-04 8:55

David Crow

14-Jun-04 8:55

Would using CRecordset::AddNew() and CRecordset::Update() be any faster? I've never directly used CDatabase::ExecuteSQL() to add rows to a table so I'm not sure which method would be more efficient.

You might want to give ExecuteSQL("BULK INSERT...") a look. If you can format your file to look like the table format, it just might work.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Stored Procedure Concept

Sridhar Sanikommu14-Jun-04 9:15

Sridhar Sanikommu

14-Jun-04 9:15

Hi David,

Did you have any example of Bulk Insert functionality? Does it work with all the databases?

Thanks,

Re: Stored Procedure Concept

David Crow14-Jun-04 10:21

David Crow

14-Jun-04 10:21

Sridhar Sanikommu wrote:
Did you have any example of Bulk Insert functionality?

Possibly. Assuming the table looks like:

Name Type
---- ----
col1 char(3)
col2 int

Create a file named mydata.txt that looks like:

abc,1;def,2;ghi,3;

Load this file into the table with:

BULK INSERT <table name here>
FROM 'mydata.txt'
WITH
  (DATAFILETYPE = 'char',
  FIELDTERMINATOR = ',', ROWTERMINATOR = ';')

Sridhar Sanikommu wrote:
Does it work with all the databases?

Having not used "all the databases," I couldn't possibly know.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Stored Procedure Concept

Sridhar Sanikommu14-Jun-04 10:50

Sridhar Sanikommu

14-Jun-04 10:50

Hi David,

I appreciate your quick response. This is the first time I posted my question in code project though I opened my account long time back(almost two years) and been following message board Q&A's. Especially, if I encounter responses from yourself, Micheal Dunn, Ravi, Prakash(you people are top of my head) etc I go through the techniques that you guys suggest.

Keep going....pass your knowledge and empower others.

BTW, do you have any generic database module(using CDatabase & CRecordset classes) which I can get?

Thanks,
Sridhar

direct stream copy with AVIFile

Zizilamoroso14-Jun-04 6:32

Zizilamoroso

14-Jun-04 6:32

I have a question regarding copying of whole compressed (DIVX) streams with the AVIFile API.

This code snippet copies the video stream to another file, but that file gets about 10 times bigger than the original. I guess the target stream is uncompressed, but the streaminfo explicitely states DIVX.

How can I copy streams from one file to the other without decompressing/compressing (direct stream copy)?

<br />
	HRESULT hr=S_OK;<br />
<br />
	PAVIFILE pSourceFile=NULL;<br />
	PAVIFILE pTargetFile=NULL;<br />
<br />
	PAVISTREAM pSourceStream=NULL;<br />
	PAVISTREAM pTargetStream=NULL;<br />
<br />
	AVISTREAMINFO streaminfo;<br />
	BITMAPINFOHEADER bitmapinfo;<br />
<br />
	AVIFileInit();<br />
<br />
	//	SOURCE<br />
	hr=AVIFileOpen(&pSourceFile,"test_source.avi",OF_SHARE_DENY_WRITE,0L);<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	hr=AVIFileGetStream(pSourceFile,&pSourceStream,streamtypeVIDEO,0);<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	LONG bitmapinfosize=sizeof(bitmapinfo);<br />
	hr=AVIStreamReadFormat(pSourceStream,0,&bitmapinfo,&bitmapinfosize);<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	hr=AVIStreamInfo(pSourceStream,&streaminfo,sizeof(streaminfo));<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	//	TARGET<br />
	hr=AVIFileOpen(&pTargetFile,"test_target.avi",OF_CREATE|OF_WRITE,0L);<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	hr=AVIFileCreateStream(pTargetFile,&pTargetStream,&streaminfo);<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	hr=AVIStreamSetFormat(pTargetStream,0,&bitmapinfo,sizeof(bitmapinfo));<br />
	if(FAILED(hr))<br />
		...<br />
<br />
	LONG lbuffersize=20000;<br />
	BYTE* buffer;<br />
	buffer=new BYTE[lbuffersize];<br />
<br />
	//	COPY LOOP<br />
	LONG lPos=0;<br />
	LONG lLen=0;<br />
	for(long lPos=AVIStreamStart(pSourceStream);lPos<AVIStreamEnd(pSourceStream);lPos++)<br />
	{<br />
		hr=AVIStreamRead(pSourceStream,lPos,1,buffer,lbuffersize,&lLen,NULL);<br />
		if(FAILED(hr))<br />
			...<br />
<br />
		DWORD dwFlag=0;<br />
		if(AVIStreamIsKeyFrame(pSourceStream,lPos))<br />
			dwFlag=AVIIF_KEYFRAME;<br />
<br />
		hr=AVIStreamWrite(pTargetStream,lPos,1,buffer,lbuffersize,dwFlag,NULL,NULL);<br />
		if(FAILED(hr))<br />
			...<br />
	}<br />
<br />
	//	RELEASE<br />
	if(pTargetStream)<br />
		AVIStreamRelease(pTargetStream);<br />
<br />
	if(pTargetFile)<br />
		AVIFileRelease(pTargetFile);<br />
<br />
	if(pSourceStream)<br />
		AVIStreamRelease(pSourceStream);<br />
<br />
	if(pSourceFile)<br />
		AVIFileRelease(pSourceFile);<br />
<br />
	delete[] buffer;<br />
<br />
	AVIFileExit();

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

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