[coding] External Symbols

[pixelstudio]

Hi there people,

i was experimenting a bit with the sdk.

i have the following code:

std::string MsgStr;
PixelBufferInterface *pixelBuffer=static_cast<PixelBufferInterface*>(GE T_INTERFACE(vrayVFB, EXT_PIXEL_BUFFER_INTERFACE));


if (pixelBuffer) {
int width=pixelBuffer->getWidth();
int height=pixelBuffer->getHeight();
//printf("Image size is %i x %i\n", width, height);
MsgStr += "Image width is :";
MsgStr += width;

//CString cs(MsgStr.c_str());
MessageBox(NULL,MsgStr.c_str(),"Warning",MB_OK);
}

it all compiles fine, but when i try to build the project i get an error:
error LNK2019: unresolved external symbol "class ClassDesc2 * __cdecl GetInterfaceToolDesc(void)" (?GetInterfaceToolDesc@@YAPAVClassDesc2@@XZ) referenced in function "class ClassDesc * __cdecl LibClassDesc(int)" (?LibClassDesc@@YAPAVClassDesc@@H@Z)

the only thing i change in this code (what was taken from the help file) was :EXT_PIXEL_BUFFER_INTERFACE
the helpfile it says without EXT_ and that i not working.
Perhaps you c++ guru's know why i get this error ?
i added a couple of lib files to my project but that does not seem to solve it.

ps: there is a little typo error in the help by getting the width

[vlado]

Just copy and paste the InterfaceID for EXT_PIXEL_BUFFER_INTERFACE and it should be fine. For some weird reason it is not a #define like other extensions.

Best regards,
Vlado

[pixelstudio]

hmm was something else,
i put a part of code in the vutils namespace, corrected this and it seems to work. even with EXT_PIXEL_BUFFER_INTERFACE

[vlado]

Ah, good.

Best regards,
Vlado

[pixelstudio]

i'm still trying to connect to the VFB,

i use the following function:

std::string MsgStr;
//#define EXT_PIXEL_BUFFER_INTERFACE InterfaceID(LARGE_CONST(2005120901))
//EXT EXT_PIXEL_BUFFER_INTERFACE
VUtils::PixelBufferInterface *pixelBuffer=static_cast<VUtils::PixelBufferInterf ace*>(GET_INTERFACE(vrayVFB,EXT_PIXEL_BUFFER_INTER FACE));


if (pixelBuffer) {
int width=pixelBuffer->getWidth();
int height=pixelBuffer->getHeight();
//printf("Image size is %i x %i\n", width, height);
MsgStr += "Image width is :";
MsgStr += width;

//CString cs(MsgStr.c_str());
MessageBox(NULL,MsgStr.c_str(),"Warning",MB_OK);
} else {
MessageBox(NULL,"Connect to VFB Failed...","Warning", MB_OK);
}

for some reason pixelBuffer is null and i get connect to vfb failed.
i tried using the const value instead of : EXT_PIXEL_BUFFER_INTERFACE but that also does not work. the declaration for the vrayVFB is : VUtils::VRayVFB *vrayVFB;

any idea what i'm doing wrong ?

cheers

[vlado]

Where do you obtain the vrayVFB variable value from?

Best regards,
Vlado

[pixelstudio]

hmm that is a good question

i have to check if the vrayVFB is filled with something in this function.
hmm thx. something to look into. i'll repost when i have something new.

[pixelstudio]

Hmm before get_interface need a vrayVFB.

i declare vrayVFB as : VUtils::VRayVFB *vrayVFB
For getting contense of the vrayvfb do i need to create a new one?

if yes, then i should use:
VRayExport VRayVFB * VUtils::VRayVFB::newDefaultVRayVFB (VRayVFBNotifyCallback *notifyCb, int noGUI)


Perhaps you have can show an example how to do this cause i'm not gettings this to work.....

[vlado]

You can obtain a pointer to the current frame buffer if you use the V-Ray renderer interface (e.g. you get a pointer to the current renderer, obtain from it a VRENDER_INTERFACE interface, cast it to a VRenderInterface class and call its method for accessing the current VFB). I don't have the code in front of me right now, but I'll check later and post it.

Best regards,
Vlado

[pixelstudio]

hmm i tried something but still doing things wrong hehehe c++ is hard to get used to. but well i'll keepon trying. this is what i have sofar:

VRenderInterface *vrender=GetVRenderInterface(GetCOREInterface()->GetCurrentRenderer());
if (vrender) {
// Renderer is V-Ray
//now get a pointer to the vrayrender.. ?
MessageBox(NULL,"Render is vray","Warning", MB_OK);
//VR::VRayVFB * getRenderVFB(vrayVFB);
VUtils::VRayVFB *vrayVFB=static_cast<VR::VRayVFB*>(getRenderVFB);

VUtils::PixelBufferInterface *pixelBuffer=static_cast<VUtils::PixelBufferInterf ace*>(GET_INTERFACE(vrayVFB,LARGE_CONST(2005120901 )));
if (pixelBuffer) {
int width=pixelBuffer->getWidth();
int height=pixelBuffer->getHeight();
//printf("Image size is %i x %i\n", width, height);
MsgStr += "Image width is :";
MsgStr += width;

//CString cs(MsgStr.c_str());
MessageBox(NULL,MsgStr.c_str(),"Warning",MB_OK);
} else {
MessageBox(NULL,"Connect to VFB Failed...","Warning", MB_OK);
}
}

btw: tested with the large_const number instead of ext_.... to see if it made a difference.

[vlado]

VUtils::VRayVFB *vrayVFB=static_cast<VR::VRayVFB*>(getRenderVFB);

Eh, you are supposed to call the method, not to get its address It should be like this:

VUtils::VRayVFB *vrayVFB=vrender->getRenderVFB();
if (vrayVFB) {
  // Do something...
}

Best regards,
Vlado