I have Windows 7 64-bit, Ms Visual Studio Professional Edition, an the latest Ati Stream SDK isntalled, on a Core2Duo E8400 system, with an EAH4850 graphic card. The samples are running, theres no problem with that.

I start VS, and click File->New->Project...

there Visual C++->Win32->Win32 Console Application, lets name it Test,

in the wizard i click empty project.

Now i right click on Test->Properties->Configuration Properties->

->C/C++->Genereal, and there, i add the include directory of Ati Stream, to the Additional Include Directories.

I can build, and run this sample code:

"#include

int main()
{
}

"

When i try

"#include

int main()
{
    cl_int a;
    cl_uint n_e=10;
    cl_platform_id *p=NULL;
    cl_uint *n_p=NULL;
    a=clGetPlatformIDs(n_e,p,n_p);
}
"

this code (may be buggy, sorry, im a noob), i get:

1>------ Build started: Project: Test, Configuration: Debug Win32 ------
1>Compiling...
1>Proba.cpp
1>Linking...
1>Proba.obj : error LNK2019: unresolved external symbol __imp__clGetPlatformIDs@12 referenced in function _main
1>C:\Users\Stib\Documents\Visual Studio 2008\Projects\Test\Debug\Test.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://c:\Users\Stib\Documents\Visual Studio 2008\Projects\Test\Test\Debug\BuildLog.htm"
1>Test - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

What am i doing wrong? Can someone help me?

UPDATE: my 2 includes are the CL/cl.h

I'm trying the C++ bindings. I use, the code at the end of the post, and i'm getting similar errors:

1>------ Build started: Project: Test, Configuration: Release Win32 ------
1>Compiling...
1>Proba.cpp
1>Linking...
1>Proba.obj : error LNK2001: unresolved external symbol __imp__clCreateContextFromType@24
1>Proba.obj : error LNK2001: unresolved external symbol __imp__clReleaseContext@4
1>C:\Users\Stib\Documents\Visual Studio 2008\Projects\Test\Release\Test.exe : fatal error LNK1120: 2 unresolved externals
1>Build log was saved at "file://c:\Users\Stib\Documents\Visual Studio 2008\Projects\Test\Test\Release\BuildLog.htm"
1>Test - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Have you specified the OpenCL library to link to?

If not, add OpenCL.lib in additional dependencies under Properties->Linker->input

and

"$(ATISTREAMSDKROOT)/lib/x86" to addtional library directories under Properties->Linker->General

That solved the problem, thank you! If i have another problem/question, i post it here. 

Ok, next issue: the first C++ binding seems to work. By the second, i get:

1>------ Build started: Project: Test, Configuration: Release Win32 ------
1>Compiling...
1>Proba.cpp
1>.\Proba.cpp(13) : error C2783: 'detail::Param_traits::Param_type cl::Context::getInfo(cl_int *) const' : could not deduce template argument for 'name'
1>        C:\Program Files (x86)\ATI Stream\include\CL/cl.hpp(1612) : see declaration of 'cl::Context::getInfo'
1>.\Proba.cpp(13) : error C2780: 'cl_int cl::Context::getInfo(cl_context_info,T *) const' : expects 2 arguments - 0 provided
1>        C:\Program Files (x86)\ATI Stream\include\CL/cl.hpp(1583) : see declaration of 'cl::Context::getInfo'
1>Build log was saved at "file://c:\Users\Stib\Documents\Visual Studio 2008\Projects\Test\Test\Release\BuildLog.htm"
1>Test - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Here is, where i work from:

LINK

The error is because of incorrect usage. The code given there is pseudocode, you can find the source code at the bottom of the same page.

THX again! I'm using that source code from now on, for my learning.

Hi!

New issue...

cl_uint num_entries=10;//in your code this should be 1
cl_platform_id platforms[10]; //make array of ten paltform id
cl_uint num_platforms;
clGetPlatformIDs(num_entries, platforms, &num_platforms);

The 10 is fine, it means, that up to 10 available platforms can be added, to the list. The thing with the array works not, tried it.

how do you mean it didnt work? currently you can obtain only one platform even if you have for example ATi and nvidia card in system.

Even if i can only get 1 platform, the code should work, only for one. But when i tested it, my program crashed. It does not work with arrays, or i do not know.

UPDATE: I tryed again, and it seems to work now, but it did not worked earlyer...interesting.

So, thanx for the help with the first issue nou!

And the other issue with the Vendor IDs?

And if i have cl_command_queue_properties, how can i view what it contains? How do i know what property to change, when i do not know the status of them? cout chrashes, and i did not found a function to view it.

And here is the next!

i think reason that vendor id is same for GPU and CPU even if its intel processor is that implemntation of OpenCL is from AMD so it return AMD vedor id.

cl_command_queue_propertis which is cl_bitfield which is cl_ulong which is 64 bit unigned int. so cout should print out it.

if(com_queue_prop & CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE)cout << "out of order is enabled";

THX again! It is great, that here i can ask, and learn!

I found to the exception thing this:

"warning C4290: C++ exception specification ignored except to indicate a function is not __declspec(nothrow)"

Could be the source of the problem this?

UPDATE: I found out, that i get random chrashes, by running my application. This explains that some of your solutions seemed not to work for me earlyer. Can it be because OpenCL is only beta??

UPDATE2: It works now. I dont know why, but it does. I did not do anything...

you must track down where it is crash. i dont help you with C++ binding.

Thank you nou for all your help!

"UPDATE2: It works now. I dont know why, but it does. I did not do anything..."

I think i got the source of the mysterious crash:

no wonder it crash. you create "wild" pointer that point to random place in memory.

I tought, that the function allocates the memory space for himself, copy the result, and gives only the pointer back. But if i know, that i MUST allocate the memory space i want to use, it all gives sense. I try to learn from Khronos's OpenCL specification 1.0 Rev.:43, opencl 1.0 c++ bindings Documentation, and from sample codes. It is not easy, with my not so good english skills, and C++ is new too for me. I learned ANSI C at the University, and i forgot many things by the time. The pointers are the hardest part from all...

Anyways, i see a future for OpenCL, i hope i'm right, and it is worth for me to learn it now. I read the discussion in the other topic, that OpenCL is slow compared to other Computing languages. I hope this will improve, because OpenCL did amaze me with its performance (i did not even heard of CUDA, or Brook+ up to that point). I want to use it on high performance level, and i do not would like to learn a "better" language for that.

Huh. So much OFF... Sorry.

Great thread

Know I knew where to start