Re: Conversion of image Handle hDib to Char* array in C++ - C / C++ / MFC Discussion Boards

Re: Conversion of image Handle hDib to Char* array in C++

CPallini14-Sep-12 3:16

CPallini

14-Sep-12 3:16

How can a digital camera provide a HANDLE to a DIB?

Veni, vidi, vici.

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf14-Sep-12 3:23

AhmdAxf

14-Sep-12 3:23

It is a method provided in its SDK which I'm using
It also saves it on the disk but I want to convert it into Char* array and later to jbyteArray.

Well the question is Is it possible to convert this Handle (which is obviously a pointer to that specific DIB) to char* array

modified 14-Sep-12 9:31am.

Re: Conversion of image Handle hDib to Char* array in C++

C^hris L^osinger14-Sep-12 5:56

C^hris L^osinger

14-Sep-12 5:56

if that handle is really a pointer to a DIB, then it's a pointer to an BITMAPINFOHEADER, with the pixel bytes immediately following.

image processing toolkits | batch image processing

Re: Conversion of image Handle hDib to Char* array in C++

Richard MacCutchan14-Sep-12 7:37

Richard MacCutchan

14-Sep-12 7:37

It's most unlikely that you would want to convert it to a char* array. If it is really a pointer to some form of bitmap then there should be a function that will return the actual bitmap structure or byte array for you, but without knowing anything about the SDK you are using it's impossible to know what.

One of these days I'm going to think of a really clever signature.

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf27-Sep-12 21:23

AhmdAxf

27-Sep-12 21:23

Thank you all for your response i have been able to create a

C++

HBITMAP

from my DIB

C++

HANDLE DIB

by using info header and filling it using GDI . I also have been able to save it to my disk and to draw it on screen by using

C++

StretchDIBits

method of the same library.Conversion of DIB to char* was not a good option.Now i want to know that is there any other good API or C++ library which can be used to draw DIB directly on

C++

tagRect

in an MFC application.

Re: Conversion of image Handle hDib to Char* array in C++

Richard MacCutchan27-Sep-12 22:54

Richard MacCutchan

27-Sep-12 22:54

StretchDIBits() already performs that function; what do you mean by tagRect?

One of these days I'm going to think of a really clever signature.

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf28-Sep-12 0:25

AhmdAxf

28-Sep-12 0:25

It is a structure which draws a rectangle in windows applications.
The problem with that method is that when i minimize my application and again restore it. The image disappears. I have also used the function

C++

FillRect()

but the problem still persists.
Kindly help me in this regard

Re: Conversion of image Handle hDib to Char* array in C++

Richard MacCutchan28-Sep-12 1:58

Richard MacCutchan

28-Sep-12 1:58

AhmdAxf wrote:
when i minimize my application and again restore it. The image disappears.

So, you are probably doing something wrong, quite possibly drawing in the wrong place. You must put all your drawing code inside the function that handles the WM_PAINT message.

One of these days I'm going to think of a really clever signature.

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf3-Oct-12 1:28

AhmdAxf

3-Oct-12 1:28

Actually it is not a MFC application which does have a method which contains WM_PAINT message.
Rather it is a java applet and I'm drawing through AWT native Interface.

Re: Conversion of image Handle hDib to Char* array in C++

Richard MacCutchan3-Oct-12 1:32

Richard MacCutchan

3-Oct-12 1:32

So why was this posted in the C/C++/MFC forum and titled "Conversion of image Handle hDib to Char* array in C++"?

One of these days I'm going to think of a really clever signature.

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf3-Oct-12 2:44

AhmdAxf

3-Oct-12 2:44

There is no separate forum for c++ or AWT native interface or JNI. So I have to post it here Frown | :(

Re: Conversion of image Handle hDib to Char* array in C++

AhmdAxf3-Oct-12 2:48

AhmdAxf

3-Oct-12 2:48

Please Let me know if there is any useful forum for this particular technology

Re: Conversion of image Handle hDib to Char* array in C++

Richard MacCutchan3-Oct-12 4:33

Richard MacCutchan

3-Oct-12 4:33

There are clearly marked forums here for Java and for C++; choose the one that is most appropriate to your problem and describe the problem in detail.

One of these days I'm going to think of a really clever signature.

I want to use R-Tree in my GIS project,how R-Tree is work?

mengfei35813-Sep-12 14:59

mengfei358

13-Sep-12 14:59

how to creat a R-Tree based on GIS.spatial object,if I know the MBR of each spatial object.how I can Know when to merge some MBR together?

Re: I want to use R-Tree in my GIS project,how R-Tree is work?

CPallini13-Sep-12 23:18

CPallini

13-Sep-12 23:18

Google and Wikipedia are fantastic tools, you know.
For instance, the R-Tree page[^] at Wikipedia looks promising.

Veni, vidi, vici.

Re: I want to use R-Tree in my GIS project,how R-Tree is work?

mengfei35823-Sep-12 15:04

mengfei358

23-Sep-12 15:04

Thank you

Re: I want to use R-Tree in my GIS project,how R-Tree is work?

CPallini23-Sep-12 21:25

CPallini

23-Sep-12 21:25

You are welcome.

Veni, vidi, vici.

DirectX9 D3DXIntersect function

Seeker200213-Sep-12 9:42

Seeker2002

13-Sep-12 9:42

Hi everybody, Smile | :)

This is for the more advanced people!

I know that the DirectX9 D3DXIntersect function has the ability to gives the exact coordinates of the intersecting ray-to-polygon, and can give the distance from the ray’s starting point to the intersection point.

Now my question is, how do I retrieve that information of the exact coordinates of the ray’s intersecting point?

I think the information if I’m not mistaken is found in the LPD3DXBUFFER * ppAllHits, but I’m not sure as to how to setup the buffer, nor access the information.

Please help… Thanks!

C++

// DirectX9 D3DXIntersect function:
// Determines if a ray intersects with a mesh.
 
HRESULT D3DXIntersect(
LPD3DXBASEMESHpMesh,
CONST D3DXVECTOR3 * pRayPos,
CONST D3DXVECTOR3 * pRayDir,
BOOL *pHit,
DWORD * pFaceIndex,
FLOAT * pU,
FLOAT * pV,
FLOAT * pDist,
LPD3DXBUFFER * ppAllHits,
DWORD * pCountOfHits);

____________________________________________

My variables and code:

Note:  My code works great.

I just need help with getting and returning the exact coordinates of my ray’s intersection with the mesh.
____________________________________________

C++

float XBegin, float YBegin, float ZBegin;   // <-- Starting Position of Ray
float XEnd, float YEnd, float ZEnd;           // <-- Ending Position of Ray
sMesh *LevelMesh;
BOOL Hit;
float u, v, Dist;
float XDiff, YDiff, ZDiff, Radius;
DWORD FaceIndex;
D3DXVECTOR3 vecDir;
 
// looking for collision intersection
while(LevelMesh != NULL) {
D3DXIntersect(LevelMesh->m_Mesh, \
&D3DXVECTOR3(XBegin,YBegin,ZBegin), &vecDir, \
&Hit, &FaceIndex, &u, &v, &Dist, NULL, NULL);
if(Hit == TRUE) {
if(Dist < Radius)
return TRUE; // polygons hit
}
return FALSE; // No polygons hit
}

Re: DirectX9 D3DXIntersect function

Seeker200226-Sep-12 18:30

Seeker2002

26-Sep-12 18:30

Hmm, I know there are some smart coders out there! anyone? Sniff | :^)

How to add a library to IDE or What exactly it means adding a library to IDE ??

SanjeevCharla13-Sep-12 3:02

SanjeevCharla

13-Sep-12 3:02

First of all, i am new to c++. I am using Netbeans IDE with mingw compiler (as i am familiar with it in java development). I want to add a new library (some thing like port audio). I have copied the include files in the port audio to mingw's include library. Code suggest in netbeans is showing the headers and functions of port audio, But the build process showing erros like

undefined reference to `Pa_Initialize'

On the whole, what ever may be the IDE or what every may be the library to add, What to do inorder to add a library to build process??

Re: How to add a library to IDE or What exactly it means adding a library to IDE ??

Richard MacCutchan13-Sep-12 4:34

Richard MacCutchan

13-Sep-12 4:34

This is really not a C++ question, rather one of how to use NetBeans. You should look at the project settings section of your project, where there should be some way of adding the reference to the library you are trying to use. Failing that you could try the NetBeans forum (if such a thing exists).

One of these days I'm going to think of a really clever signature.

Re: How to add a library to IDE or What exactly it means adding a library to IDE ??

jschell13-Sep-12 8:23

jschell

13-Sep-12 8:23

C++ has to parts.
- Compiling
- Linking

Header files are using in compiling.
Libraries are used in linking.

If you are getting a compile error then there is something wrong with your includes.
If you are getting a link error then there is something wrong with your libraries OR something wrong with the way in which you used the includes. The latter is often caused by incorrectly using C code (from the library) in C++ code.

For the most part it should never matter what order libraries are in.

Re: How to add a library to IDE or What exactly it means adding a library to IDE ??

SanjeevCharla13-Sep-12 16:05

SanjeevCharla

13-Sep-12 16:05

@jschell

Thanks for your response, And i just want to know one more thing. So, to add a library to build path, we must have the header files (.h) and also library files(.dll on windows)of that library. isn't it ?

Re: How to add a library to IDE or What exactly it means adding a library to IDE ??

jschell14-Sep-12 8:49

jschell

14-Sep-12 8:49

You must specify both somewhere. And it will be in different locations.

Use of Multiple Check boxes in MFC

jawadali47712-Sep-12 20:12

jawadali477

12-Sep-12 20:12

hi,
i am using multiple Check Boxes in my GUI and i wanted that only one gets checked at a time i.e when one Check Box gets checked by user the others should automatically get unchecked.
i can't use Radio Buttons since i don't find its "Auto" check and uncheck from "Behavior" in its "Properties" in vs2008.
any help in this regards please.

Regards
Jawad

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