wxImage ConverTo wxBitmap how to ?

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Evil85
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wxImage ConverTo wxBitmap how to ?

Post by Evil85 » Fri Aug 08, 2008 6:56 pm

Sry,my English isn't very well.

I have problem:

I want convert a wxImage to wxBitmap

I tried
wxImage img;
wxBitmap bmp = (wxBitmap)img;

this wrote Seg Fault,I don't understand,early this was good,now isn't.

App is output this:

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion `G_TYPE_IS_INSTANTIATABLE (instance_type)' failed

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:23652): GLib-GObject-CRITICAL **: g_object_new: assertion `G_TYPE_IS_OBJECT (object_type)' failed


Backtrace is here:

#0 0xb74f9079 in gtk_window_new () from /usr/lib/libgtk-x11-2.0.so.0
#1 0xb7b17634 in wxGetRootWindow () from /usr/local/lib/libwx_gtk2_core-2.8.so.0
#2 0xb7b1aa71 in wxBitmap::CreateFromImageAsPixmap () from /usr/local/lib/libwx_gtk2_core-2.8.so.0
#3 0xb7b1b798 in wxBitmap::CreateFromImage () from /usr/local/lib/libwx_gtk2_core-2.8.so.0
#4 0x0804f8ed in LoadImages (this=0xbfce29e0, [email protected], [email protected]) at /home/evil/wxWidgets-2.8.7/include/wx/gtk/bitmap.h:65
#5 0x0804e44c in Load::initFromDatFile (this=0xbfce2af0) at ../Load.cpp:244
#6 0x0804f103 in Load (this=0xbfce2af0, [email protected]) at ../Load.cpp:15
#7 0x0804fb1b in main (argc=Cannot access memory at address 0x0
) at ../Main.cpp:9


and I tried

wxBitmap bmp(img); <--this isn't good.

Documentation wrote,I don't use ConvertToBitmap.

I use wxWidgets 2.8.7 and 2.8.8

I haven't more idea.

Pleas help me.

Thanks Evil

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Post by FlyingIsFun1217 » Fri Aug 08, 2008 8:39 pm

wxBitmap(const wxImage& img, int depth = -1)

Creates bitmap object from the image. This has to be done to actually display an image as you cannot draw an image directly on a window. The resulting bitmap will use the provided colour depth (or that of the current system if depth is -1) which entails that a colour reduction has to take place.

When in 8-bit mode (PseudoColour mode), the GTK port will use a color cube created on program start-up to look up colors. This ensures a very fast conversion, but the image quality won't be perfect (and could be better for photo images using more sophisticated dithering algorithms).

On Windows, if there is a palette present (set with SetPalette), it will be used when creating the wxBitmap (most useful in 8-bit display mode). On other platforms, the palette is currently ignored.

Code: Select all

wxImage *yourwxImage = new wxImage(...);
wxBitmap *yourBMap = new wxBitmap(yourwxImage, -1);
FlyingIsFun1217 ;)

Evil85
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Post by Evil85 » Fri Aug 08, 2008 9:45 pm

FlyingIsFun1217 wrote:
wxBitmap(const wxImage& img, int depth = -1)

Creates bitmap object from the image. This has to be done to actually display an image as you cannot draw an image directly on a window. The resulting bitmap will use the provided colour depth (or that of the current system if depth is -1) which entails that a colour reduction has to take place.

When in 8-bit mode (PseudoColour mode), the GTK port will use a color cube created on program start-up to look up colors. This ensures a very fast conversion, but the image quality won't be perfect (and could be better for photo images using more sophisticated dithering algorithms).

On Windows, if there is a palette present (set with SetPalette), it will be used when creating the wxBitmap (most useful in 8-bit display mode). On other platforms, the palette is currently ignored.

Code: Select all

wxImage *yourwxImage = new wxImage(...);
wxBitmap *yourBMap = new wxBitmap(yourwxImage, -1);
FlyingIsFun1217 ;)
Thx for your help,but I tried early this too
and now too.

But my app write output :

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion `G_TYPE_IS_INSTANTIATABLE (instance_type)' failed

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: gtype.c:2242: initialization assertion failed, use IA__g_type_init() prior to this function

(process:26380): GLib-GObject-CRITICAL **: g_object_new: assertion `G_TYPE_IS_OBJECT (object_type)' failed

I don't know why ...

I tried debug my app with eclipse ,but
I step by step in my app and unexpectedly it call gtk_window_new() and I don't know why and then crashed my app . I don't use GUI this version,this version is only cmd line version.

Anything idea? somebody ?

Thx Evil

U see the Attachment File ,it is Full BackTrace
Attachments
full_backtrace.txt
Full BackTrace of my App
(4.5 KiB) Downloaded 45 times

FlyingIsFun1217
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Post by FlyingIsFun1217 » Fri Aug 08, 2008 10:02 pm

Since wxImage and wxBitmap are custom types, you cannot typecast as you can with the standard library.

Every try typecasting a char to a wxString? It doesn't work well, does it? ;)

Again, I would suggest trying the method I posted, I can guarantee it will work (the method, not my code).

FlyingIsFun1217

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Post by doublemax » Fri Aug 08, 2008 10:06 pm

wxBitmap bmp(img) should work.

use wxImage::IsOk() to check if your wxImage contains any valid data.
How do you create the wxImage object?
If you load it from an external file, check if the loading was successful.
Use the source, Luke!

Evil85
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Post by Evil85 » Fri Aug 08, 2008 10:13 pm

FlyingIsFun1217 wrote:Since wxImage and wxBitmap are custom types, you cannot typecast as you can with the standard library.

Every try typecasting a char to a wxString? It doesn't work well, does it? ;)

Again, I would suggest trying the method I posted, I can guarantee it will work (the method, not my code).

FlyingIsFun1217
I tried your method,but it wrote was I copy here early ...
I don't know why ..

Evil85
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Post by Evil85 » Fri Aug 08, 2008 10:17 pm

doublemax wrote:wxBitmap bmp(img) should work.

use wxImage::IsOk() to check if your wxImage contains any valid data.
How do you create the wxImage object?
If you load it from an external file, check if the loading was successful.
I check all step ...

U see this :

Load::Load(wxString filename) {
if (!filename.IsEmpty()) {
if (m_inputfile.Open(filename)) {
wxPrintf(_T("All right, '%s' file open succesful.\n "), m_inputfile.GetName());
//initFromDatFile();
} else {
wxPrintf(_T("ERROR: can't open '%s'\n"), m_inputfile.GetName());
}
}else{
wxPrintf(_T("ERROR: I need minimum one filename!"));
}
}


and sorry for form of code ,It looks badly here

so and :

ImplementOfAlg.m_TemplateImage = new wxImage();
if ( !(*ImplementOfAlg.m_TemplateImage).LoadFile(TemplateImg) ) {
wxLogError(_T("Couldn't load Template Image from '%s'."),
TemplateImg.c_str());
} else {
*ImplementOfAlg.m_TemplateImage =(*ImplementOfAlg.m_TemplateImage).ConvertToGreyscale();
ImplementOfAlg.m_pTemplateColours = (*ImplementOfAlg.m_TemplateImage).GetData();
ImplementOfAlg.m_pTemplateColours = ImplementOfAlg.Thresholding(ImplementOfAlg.m_pTemplateColours, *ImplementOfAlg.m_TemplateImage, 0);



(ImplementOfAlg.m_TemplateImageBitmap)=new wxBitmap(*ImplementOfAlg.m_TemplateImage);

}

I check All ,in all line ,and all case

anything idea ?

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Post by doublemax » Fri Aug 08, 2008 10:36 pm

do you have an object derived from wxApp, or do you just start your program with main()?

In the latter case you need to initialize the wx library first. Just put this as the first line in main():

Code: Select all

wxInitializer initializer; 
Use the source, Luke!

Evil85
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Post by Evil85 » Fri Aug 08, 2008 11:00 pm

doublemax wrote:do you have an object derived from wxApp, or do you just start your program with main()?

In the latter case you need to initialize the wx library first. Just put this as the first line in main():

Code: Select all

wxInitializer initializer; 
I think ,I don't need wxApp.
I just start my program with main().

I tried what,u wrote,but don't change nothing ...

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Post by FlyingIsFun1217 » Fri Aug 08, 2008 11:27 pm

Maybe post your source, I'm sure this would help quite a bit.

FlyingIsFun1217

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Post by Auria » Fri Aug 08, 2008 11:28 pm

Evil85 wrote: and sorry for form of code ,It looks badly here

then please use code tags
Evil85 wrote:
doublemax wrote:do you have an object derived from wxApp, or do you just start your program with main()?

In the latter case you need to initialize the wx library first. Just put this as the first line in main():

Code: Select all

wxInitializer initializer; 
I think ,I don't need wxApp.
I just start my program with main().

I tried what,u wrote,but don't change nothing ...
you do need to init wx somehow, see the docs and samples...

Evil85
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Post by Evil85 » Fri Aug 08, 2008 11:36 pm

FlyingIsFun1217 wrote:Maybe post your source, I'm sure this would help quite a bit.

FlyingIsFun1217
Okay,but my code is very unfinished ..

I wrote early this app ,but it isn't good OO app,because my menthor say ,I write fast a app ,and I have time now,I rethink all ,and refactoring full code.Early code is running,but not good code style and not OO code ... and it use a libary,but between my app and lib communication was slow,because it was throught file.I make a .so from it lib,but I use it good without communication of file ,I must edit it lib and I make .so.

I see now,I can attachment file only three .
I make a package from my source ... a moment
Attachments
Program_use_datas.tar.gz
my program use this files
(5.55 KiB) Downloaded 43 times
Package.tar.gz
my Package
(5.52 KiB) Downloaded 43 times
Last edited by Evil85 on Fri Aug 08, 2008 11:51 pm, edited 1 time in total.

Evil85
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Post by Evil85 » Fri Aug 08, 2008 11:47 pm

Auria wrote:
Evil85 wrote: and sorry for form of code ,It looks badly here

then please use code tags
Evil85 wrote:
doublemax wrote:do you have an object derived from wxApp, or do you just start your program with main()?

In the latter case you need to initialize the wx library first. Just put this as the first line in main():

Code: Select all

wxInitializer initializer; 
I think ,I don't need wxApp.
I just start my program with main().

I tried what,u wrote,but don't change nothing ...
you do need to init wx somehow, see the docs and samples...
Sry ALL ,I'm begginner here ... I register yesterday (08.08 )
Thx warning,I try in the future better write my ploblem


I found this now:

wxWidgets/Image sample /Image.cpp

if ( image.LoadFile( dir + _T("test.png") ) )
my_square = wxBitmap( image );

I tried ,but this isn't good too

Evil85
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Post by Evil85 » Sun Aug 10, 2008 1:20 pm

Evil85 wrote:
Auria wrote:
Evil85 wrote: and sorry for form of code ,It looks badly here

then please use code tags
Evil85 wrote: I think ,I don't need wxApp.
I just start my program with main().

I tried what,u wrote,but don't change nothing ...
you do need to init wx somehow, see the docs and samples...
Sry ALL ,I'm begginner here ... I register yesterday (08.08 )
Thx warning,I try in the future better write my ploblem


I found this now:

wxWidgets/Image sample /Image.cpp

if ( image.LoadFile( dir + _T("test.png") ) )
my_square = wxBitmap( image );

I tried ,but this isn't good too
somebody, anything ideas?

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Post by doublemax » Sun Aug 10, 2008 1:32 pm

not really.

After googling a bit it seems that the 'IA__g_type_init()' error indicates that the GTK part is not initialized properly, but as i work on MSW only, i have no idea why this happens and/or how to fix it.

I don't know if it helps, but i suggest rewriting your code, get rid of main() and use a wxApp instance. Check the "minimal" sample, it shouldn't be much work to do that.

BTW: i assume you're using your program with a X server running. It probably won't work in text mode only.
Use the source, Luke!

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