clGetPlatformIDs
clGetPlatformIDs
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clGetPlatformIDs Obtain the list of platforms available.

##

cl_int `clGetPlatformIDs` cl_uint num_entries cl_platform_id*platforms cl_uint*num_platforms

## Parameters

`num_entries`

  The number of cl_platform_id entries that can be added to `platforms`. If `platforms` is not NULL, the `num_entries` must be greater than zero.

`platforms`

  Returns a list of OpenCL platforms found. The cl_platform_id values returned in `platforms` can be used to identify a specific OpenCL platform. If `platforms` argument is NULL, this argument is ignored. The number of OpenCL platforms returned is the mininum of the value specified by `num_entries` or the number of OpenCL platforms available.

`num_platforms`

  Returns the number of OpenCL platforms available. If `num_platforms` is NULL, this argument is ignored.

## Errors

Returns CL_SUCCESS if the function is executed successfully. Otherwise it returns CL_INVALID_VALUE if `num_entries` is equal to zero and `platforms` is not NULL, or if both `num_platforms` and `platforms` are NULL.

Returns CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

## Specification

OpenCL Specification

## Also see

clGetPlatformInfo, clGetDeviceInfo, Cardinality Diagram

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