Re: Newbie Image Help - C / C++ / MFC Discussion Boards

Thomas Blenkers14-Dec-01 0:21

14-Dec-01 0:21

When you are in Report mode, something like this SwapRows function should help:

void CMyListCtrl::SwapRows(int row1, int row2)
{
// rowText will hold all column text for one row
CStringArray rowText;

LV_ITEM lvitemrow1, lvitemrow2;

int nColCount = GetColumnCount();

rowText.SetSize( nColCount );

int i;
for( i=0; i < nColCount; i++)
rowText[i] = GetItemText(row1, i);

lvitemrow1.mask = LVIF_IMAGE | LVIF_PARAM | LVIF_STATE;
lvitemrow1.iItem = row1;
lvitemrow1.iSubItem = 0;
lvitemrow1.stateMask = LVIS_CUT | LVIS_DROPHILITED |
LVIS_FOCUSED | LVIS_SELECTED |
LVIS_OVERLAYMASK | LVIS_STATEIMAGEMASK;

lvitemrow2 = lvitemrow1;
lvitemrow2.iItem = row2;

GetItem( &lvitemrow1 );
GetItem( &lvitemrow2 );

for( i=0; i< nColCount; i++)
SetItemText(row1, i, GetItemText(row2, i) );

lvitemrow2.iItem = row1;
SetItem( &lvitemrow2 );

for( i=0; i< nColCount; i++)
SetItemText(row2, i, rowText[i]);

lvitemrow1.iItem = row2;
SetItem( &lvitemrow1 );
}

WM_HOPEITHELPED

One more question about CreateProcess, etc

12-Dec-01 11:10

Thank you all for your help with my CreateProcess question. WaitForSingleObject was just what I was looking for!

Now I have just one more question for you. How can I wait for the process - and all processes it creates - complete? I am guessing I must somehow check the process periodically to see if it has any children, and then possibly use WaitForSingleObject on them? Confused | :confused:

Any help would be nice, especially if you can explain how or why to do something (hey, I'm still learning).

Cheers,

Russell McCurly
Hobbiest Programmer

Re: One more question about CreateProcess, etc

Bill Wilson12-Dec-01 13:04

Bill Wilson

12-Dec-01 13:04

I'm assuming you are looking for a general solution. e.g. any process with any children, not something you wrote yourself or have access to the source for.

If the process you launched waits for its child processes, you don't need to do anything more than wait for it.

I don't know how to check a process for children. But, even if there is one, I don't think you can rely on it. Here is one of the creation flags available to create process:

CREATE_NEW_PROCESS_GROUP
Here's its description from MSDN:

The new process is the root process of a new process group. The process group includes all processes that are descendants of this root process. The process identifier of the new process group is the same as the process identifier, which is returned in the lpProcessInformation parameter. Process groups are used by the GenerateConsoleCtrlEvent function to enable sending a CTRL+C or CTRL+BREAK signal to a group of console processes

Hope this helps,
Bill

Re: One more question about CreateProcess, etc

13-Dec-01 5:25

Thank you for the reply. I have tried various different ways of calling CreateProcess, including CREATE_NEW_PROCESS_GROUP as you suggested, and other flags and non-nulled parameters that mentioned some kind of inheritance, but WaitForSingleObject still say's it returns when the first process ends (rather than it's children).

Have you any further ideas?

Cheers,

Russell McCurly
Hobbiest Programmer

Newbie Image Help

Jerry Wang12-Dec-01 8:50

Jerry Wang

12-Dec-01 8:50

Hi, I have a string of RGB RGB RGB RGB bytes that makes up a image, and I'd like to display it onto the screen. Can someone please give me the road map for doing that? It's kinda confusing for someone w/ minium graphical background. Here's what I wanted to do:

1. Put the RGBRGBRGBRGB string into a CBitmap
2. Display the CBitmap onto my screenDC (where screen may have any color bit depth -32bit 24bits 16bits...)

My CBitmap image only displays properly when my monitor is set to 32bit/pixel. I believe I need to use DIB for these various bit depth compatability.

THANKS IN ADVANCE! Big Grin | :-D

Re: Newbie Image Help

Christian Graus12-Dec-01 10:17

Christian Graus

12-Dec-01 10:17

Yes, to get an image that will display on any screen, you need a DIBSECTION. There are some good DIBSECTION wrappers on this site. The good thing is having created on, you get a pointer to the image data, and can just move your byte array into it. There's a catch though - Windows stores images a BGR, not RGB. If indeed you have RGB ( not BGR ), you'll need to swap some values as you copy them in, otherwise memset will be fine.

If the wrapper you use does not have a draw method, you can just create a DC and select your image into it.

CDC memDC;
memDC.CreateCompatibleDC(NULL);
memDC.SelectObect(name of your image, dereferenced if it's a pointer, assuming it offers operator HBITMAP);

then you can just BitBlt it onto the screen.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: Newbie Image Help

12-Dec-01 12:38

Thank you Christian for the tip. I found a DIBSection wrapper in Code Project, but the image still does not display properly with 16-bit color depth monitor setting.

I think it's because I am creating a bitmap wrong. Can you please take a look at the following:

*imageBuffer points to my image array BGRxBGRxBGRx...

<br />
	bitmapBefore.CreateBitmap(sizeBefore.cx, sizeBefore.cy, 1, 32, imageBuffer);<br />

And then I display the bitmapBefore in my view.

This is what I did before in view:

<br />
	CBitmap *bitmap = &(pDoc->bitmapBefore);<br />
	dcTemp.CreateCompatibleDC(&cDC);<br />
	dcTemp.SelectObject(bitmap);<br />
	cDC.BitBlt(0,0, pDoc->sizeAfter.cx, pDoc->sizeBefore.cy,<br />
			   &dcTemp, 0, 0, SRCCOPY);<br />
<br />

and this is what I changed w/ DIBSection wrapper:

<br />
	CBitmap *bitmap = &(pDoc->bitmapBefore);<br />
	CDIBSectionLite dibsection;<br />
	dibsection.SetBitmap(*bitmap);<br />
	dibsection.Draw(&cDC, CPoint(0,0));<br />

They give the same results... Whenever I set my screen color depth to anything other than True Color (32bit), I get white surface. Can you spot what I'm doing wrong?

Thanks for your help!

Jerry

Re: Newbie Image Help

Christian Graus12-Dec-01 13:12

Christian Graus

12-Dec-01 13:12

Having looked at the DIBSectionLite code, the draw function works one of two ways, depending on if hDrawDib is defined ( not NULL ).

I don't know anything about DibDrawDib, but if you comment out lines 636-649 of DibSectionLite, it will then act the way I was anticipating, and I see no reason for you to have any worries.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: Newbie Image Help

Joaquín M López Muñoz12-Dec-01 11:55

Joaquín M López Muñoz

12-Dec-01 11:55

Christian has already answered your question in an authoritative fashion, but I'd like to point out two more catches (apart from the BGR order) you should be aware of:

There's a padding issue, namely that all bitmap rows must occupy a number of bytes that is multiple of 4. For instance, if your image is 5 pixels wide, then the bitmap is stored as
```
/----row 1-----\/----row 2-----\/----row 3-----\
BGRBGRBGRBGRBGRXBGRBGRBGRBGRBGRXBGRBGRBGRBGRBGRX...
```
Where the X is one padding byte that makes every row occupy 16 bytes (the value of this byte is irrelevant).
The first row stored is at the bottom, and the last one at the top. The usual assumption is the other way around, but the MS guys decided on this order for some strange reason.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Newbie Image Help

12-Dec-01 12:53

Really? I'm a bit confused... I experimented w/ byte ordering RGB values in my CBitmap, and it came out to be BGRxBGRxBGRx... which displayed properly in a 32-bit color depth monitor setting.

So, that must be what's wrong w/ my code then? I should create BGRBGRBGRBGRX... and how should I create this DIB? Is DIB a sub-catagory of CBitmap?

Also, since CreateDIBSection asks for pDC, how can I create an DIB image when I don't have a DC that goes with it... or can I?

Thanks man!

Re: Newbie Image Help

Christian Graus12-Dec-01 13:18

Christian Graus

12-Dec-01 13:18

Yes, the bottom to top ordering and the BGR ordering are standard in windows, so if the image is coming in that way, then it's fine.

CBitmap is a DDB - a device dependant bitmap. A DIB is device INdependant, in other words it defines it's own colour depth instead of relying on the colour depth of a device. A DIB cannot be used to draw on, etc. using a CDC. A DIBSection is a hybrid creature - a DIB that has a HBITMAP which can be selected into a DC and used like any other HBITMAP ( which CBitmap is an extended wrapper for ).

CreateDIBSection can just be passed in a CDC created with CreateCompatibleDC(NULL); The code I pointed you to on the WDJ site does this.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: Newbie Image Help

13-Dec-01 12:11

Thanks Christian for the explaination. Thanks Jouquin for your help also. PJ Arends sent me a really helpful section of the code using CreateDIBSection and SetDIBits. Just like you said. I am able to display images in different bit depths now Smile | :)

Thanks so much.

How to launch an executable directly from memory?

John Osborn12-Dec-01 8:39

John Osborn

12-Dec-01 8:39

I need some ideas. I have an encrypted executable file on disk. I decrypt the file to an array of bytes in memory. I would like to execute the file directly from memory without writing the decrypted file to disk. Anyone have an idea how to do this on Windows 2000?

Re: How to launch an executable directly from memory?

Joaquín M López Muñoz12-Dec-01 9:22

Joaquín M López Muñoz

12-Dec-01 9:22

Well, seems what you intend is feasible in principle. The idea is to create a virtual memory area allocated, commited and given execution access with VirtualAlloc(...,MEM_COMMIT,PAGE_EXECUTE_READWRITE), copy the data there and jump into it (this last part might become tricky IMHO). Do a search on Usenet for "VirtualAlloc PAGE_EXECUTE", lots of information about this issue, though none conclusive.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: How to launch an executable directly from memory?

John Osborn12-Dec-01 13:26

John Osborn

12-Dec-01 13:26

Yes, it does look pretty tricky. The system apparently creates a process kernal object, then a 4-GB address space for the process, and maps the exe file into the address space. Then it calls LoadLibrary on each of the dlls listed in the exe file and does some address fixups when necessary. In short, this is quickly becoming very complicated. What I need is something like a CreateProcess that takes a memory address instead of a filename. Or, maybe even better, a way to create a virtual disk drive in memory and just do a file copy to the virtual drive and use CreateProcess or ShellExecute. Have you heard of any virtual disk drive programs for Win2000? I know that they are available for MS-DOS.

Is it possible to change bmp in executable

SAK12-Dec-01 7:36

SAK

12-Dec-01 7:36

I have a program installed where I need to change one of the toolbar images. All I have is the executable, I believe it is possible to extract resources from an executable but is it possible to modify these resources (in the case of the tool bar bmp).

Regards,

SAK

Re: Is it possible to change bmp in executable

Rick York12-Dec-01 7:58

Rick York

12-Dec-01 7:58

You can open the executable with Visual C++, select open as resources, and then edit the toolbar bitmaps.

I just tried it. Smile | :)

Re: Is it possible to change bmp in executable

Ernest Laurentin12-Dec-01 7:59

Ernest Laurentin

12-Dec-01 7:59

Look at these functions:

BeginUpdateResource<br />
UpdateResource<br />
EndUpdateResource

Good luck!

Re: Is it possible to change bmp in executable

Alvaro Mendez12-Dec-01 8:06

Alvaro Mendez

12-Dec-01 8:06

If you're looking for a tool for the job, ResourceHacker is probably the best one out there.

Regards,
Alvaro

Problem with ActiveX

12-Dec-01 7:00

Hi all,

I implemented an ActiveX which runs fine in Debug mode.
When I compiled the project in Release mode, I got this
error message "Can't execute program".

Apparently, after the compilation process, the
myApp::InitInstace() is called which in turn calls

STDAPI DllRegisterServer(void)
{
AFX_MANAGE_STATE(_afxModuleAddrThis);

if (!AfxOleRegisterTypeLib(AfxGetInstanceHandle(), _tlid))
return ResultFromScode(SELFREG_E_TYPELIB);

if (!COleObjectFactoryEx::UpdateRegistryAll(TRUE))
return ResultFromScode(SELFREG_E_CLASS);

return NOERROR;
}

for some wild reason, It trys to run something after InitInstance.
The DllRegisterServer() function returns NOERROR.
I tried this on the command line, still got the same error:
c:>regsvr32 myActx.ocx

Does anyone know why?
Eek! | :eek:

Thanks

Re: Problem with ActiveX

Ernest Laurentin12-Dec-01 8:32

Ernest Laurentin

12-Dec-01 8:32

Try to register it with: (menu command) Tools->Register Control
or
Try to execute it from the activex control container tool
or
You still can debug it Release, goto: Project->Settings
C/C++ Tab:
Optimizations: Default
Debug Info: Program Database for Edit and Continue

Link Tab:
[x] Generate Debug Info

Good luck!

Re: Problem with ActiveX

13-Dec-01 5:38

Thanks Ernest,
Debugging the release version won't help.
I register the activex on the command line as follows:

c:>regsvr32.exe myActX.ocx

The result was successfull. Right after that, regsvr32
trys to run something else. Then the MsDev pops up along
with the popup window with the error message:

"Cannot execute program"

It only happens when I try to build a release version.
The strange thing is It never happens in debug version Confused | :confused:

don't know why
Confused | :confused:

Re: Problem with ActiveX

Ernest Laurentin13-Dec-01 5:51

Ernest Laurentin

13-Dec-01 5:51

Can you see your control with the "ActiveX Control Container Test" program?
"Microsoft Visual Studio\Common\Tools\tstcon32.exe". If it works, your problem
is caused by something else. And check carefully the path of the control.
click "New control" toolbar button.

Re: Problem with ActiveX

13-Dec-01 6:19

Yes, I can see the ActiveX control in "ActiveX Control Container Test".
It works and the path of the control is also correct.

The client test program is also working. The regsvr32.exe does
install/uninstall the ActiveX. The BUG (perhaps not a good choice of word
for today Poke tongue | ;-P

) appears right after install/uninstall the ActiveX.

Thanks for your inputs.

Re: Problem with ActiveX

14-Dec-01 4:20

Problem solved !
Poke tongue | ;-P

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