> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XPackageEstimateDownloadSize

> XPackageEstimateDownloadSize

# XPackageEstimateDownloadSize

Computes the download size of the chunks that match the specified installation selectors.

## Syntax

```cpp theme={null}
HRESULT XPackageEstimateDownloadSize(  
         const char* packageIdentifier,  
         uint32_t selectorCount,  
         XPackageChunkSelector* selectors,  
         uint64_t* downloadSize,  
         bool* shouldPresentUserConfirmation  
)  
```

### Parameters

*packageIdentifier*   \_In\_z\_\
Type: char\*

A string that uniquely identifies the installed package on the disk. For more information about package identifiers, see [Manage and license downloadable content (DLC)](/publishing/xstore-commerce/xstore-dlc).

*selectorCount*   \_In\_\
Type: uint32\_t

The number of selectors in the *selectors* parameter.

*selectors*   \_In\_reads\_(selectorCount)\
Type: [XPackageChunkSelector\*](/reference/system/xpackage/structs/xpackagechunkselector)

An array of selectors that specify the chunks to be operated on.

*downloadSize*   \_Out\_\
Type: uint64\_t\*

On return, contains the download size of the specified installation selectors.

*shouldPresentUserConfirmation*   \_Out\_opt\_\
Type: bool\*

If the download would require the user's confirmation, returns true; otherwise, returns false.

### Return value

Type: HRESULT

HRESULT success or error code.

## Remarks

<Note>This function isn't safe to call on a time-sensitive thread. For more information, see [Time-sensitive threads](https://learn.microsoft.com/gaming/gdk/docs/gdk-dev/console-dev/overviews/threads/time-sensitive-threads).</Note>

If provided, the *shouldPresentUserConfirmation* parameter will be set to true if the estimated download size is large enough to prompt the user to accept the download size.

The following example accepts a track name for a racing game and, if the track is not installed, prints the download size for the track:

```cpp theme={null}
HRESULT ListDownloadSize(char* trackName)
{
    XPackageChunkSelector selector;
    selector.type = XPackageChunkSelectorType::Tag;
    selector.tag = trackName;

    char id[XPACKAGE_IDENTIFIER_MAX_LENGTH];
    HRESULT hr = XPackageGetCurrentProcessPackageIdentifier(_countof(id), id);
    if (FAILED(hr)) return hr;

    XPackageChunkAvailability availability;
    hr = XPackageFindChunkAvailability(id, 1, &selector, &availability);
    if (FAILED(hr)) return hr;

    if (availability == XPackageChunkAvailability::Installable)
    {
        uint64_t downloadSize;
        hr = XPackageEstimateDownloadSize(id, 1, &selector, &downloadSize, nullptr);
        if (FAILED(hr)) return hr;

        printf("Download Size for track %s: %I64u\n", trackName, downloadSize);
    }

    return hr;
}
```

## Requirements

**Header:** XPackage.h

**Library:** xgameruntime.lib

**Supported platforms:** Windows, XBOX One family consoles and XBOX Series consoles

## Conceptual documentation

* [Time-sensitive threads](https://learn.microsoft.com/gaming/gdk/docs/gdk-dev/console-dev/overviews/threads/time-sensitive-threads)

## See also

[XPackage](/reference/system/xpackage/xpackage_members)\
[Streaming Installation and Intelligent Delivery](/build/core-features/common/packaging/overviews/streaming_install-intelligent_delivery)


## Related topics

- [XPackageInstallChunksAsync](/reference/system/xpackage/functions/xpackageinstallchunksasync.md)
- [XPackageInstallChunks](/reference/system/xpackage/functions/xpackageinstallchunks.md)
- [XPackage](/reference/system/xpackage/xpackage_members.md)
- [Unity C# API wrappers for the GDK](/build/gdk-and-engines/unity/unity-api-wrappers.md)
- [Make package (makepkg.exe)](/build/core-features/common/packaging/deployment/makepkg.md)