Tag: function

I just discovered powershell workflows and am experimenting, but I have some difficulties. I don't know if workflows have any of the following functions at all, but if so, I would appreciate instructions for the following functions to work.

In short, my role workflow ProcessFrame is (hopefully) designed to accept an array of arrays, look at two fields in the second dimension of the array, and return certain values ​​from other arrays of the second dimension to a if the paired values ​​in one of the arrays of the second dimension match the conditional parameters match new array that returns the function. Okay, I understand that this description may have given you a headache. So let me create an example using the script.

By the way, I know how to do that with a traditional one foreach Loop, but if possible I want to use that foreach -parallel Powershell workflow features to learn a new skill.

When I refer to the "second" or "third" field of an array, I start from zero. The field on the far left would be called "zero". An array of (1,2,3) would be called fields zero, one and two. I just want to avoid confusion.

Suppose the array or arrays are filled as follows (as a variable $ inputArray):

$inputArray(0):(1,1,FRAME,BEGIN,1)
$inputArray(1):(1,2,media_type,video,2)
$inputArray(2):(1,2,pkt_pts,1234,3)
$inputArray(3):(1,2,pict_type,P,4)
$inputArray(4):(1,1,key_frame,0,5)

The following script is intended to process all arrays of the second dimension in $ inputArray and return key data if the conditions are met. In particular, it should first be determined whether the matching pair of exists media_type,video in the fields $inputArray()(2),$inputArray()(3) in a single array with a second dimension (in this example $inputArray(1)(2),$inputArray(1)(3)). If not, return a one-dimensional array with three solid fields $returnArray=@(0,0,0). If the matching pair exists – as in this example in $inputArray(1)(2),$inputArray(1)(3) – Then a one-dimensional array with data from other arrays should be returned.

In particular, it should find the second dimension arrays that contain pict_type and key_frame in the field of the second dimension $inputArray()(2). Then the matching values ​​of the same array of the second dimension should be extracted in the field $inputArray()(3). It should then fill the $ returnArray with the corresponding values ​​of $returnArray=@($inputArray(0)(0),$inputArray(3)(3),$inputArray(4)(3)). Please do not worry about the first return field from $inputArray(0)(0) as a value in the first field of arrays of the second dimension – $inputArray()(0) will all be the same; it is simply passed on to them $returnArray.

Provided that this is possible with workflow and foreach -parallelI am unable to figure out how to tell the function if any of the second dimension arrays match media_type,video in their second and third fields they meet if-then Condition. Once I figure out how to do it in you foreach -parallel Loop, I will continue on how to respond to this information. Especially if they don't meet them if-then Condition, return a (0,0,0) Array; Otherwise, continue processing the second dimension arrays and look for keywords in the second field. If found, return the value of the third field within the specified array of the second dimension.

So here is the skeletal structure that I have. I've tried a lot of things, but I'm not getting anywhere near the results I want. Thanks for your help.

workflow ProcessFrame
{
    (CmdletBinding())
    param (
        # The input will be an array of arrays where the first dimension is of variable length (20-45) and the second dimension each have 5 fields.
        # Example (with only two first dimensions - that is, 2 arrays of arrays):
        # $frameArray(0):@(int32,int32,string,string,int32)
        # $frameArray(1):@(int32,int32,string,string,int32)
        $inputArray
    )

    foreach -parallel ($i in $inputArray)
    { 
        # Determine if any single second dimension array $inputArray()(2),$inputArray()(3) matches "media_type,video".
        # If not exit function with return array of (0,0,0)
        if ($i(2) -eq "media_type" -and $i(3) -ne "video")
        {
            # the following may now work; it is a placeholder until I know the correct commands.
            Write-Output @(0,0,0)
        }
        # Determine if any single second dimension array $inputArray()(2),$inputArray()(3) matches "media_type,video".
        # If yes, extract key data from specific second dimension arrays and return values
        else
        {
            if ($i(2) -eq "pict_type")
            {
                $pictType=$inputArray()(3)
            }
            if ($i(2) -eq "key_frame")
            {
                $keyFrame=$inputArray()(3)
            }

            # the following may now work; it is a placeholder until I know the correct commands.
            Write-Output "$($inputArray(0)(0)),$pictType,$keyFrame)"          
        }
    }
}