---
title: "withPlatformString(_:)"
framework: system
role: symbol
role_heading: Instance Method
path: "system/filepath/root-swift.struct/withplatformstring(_:)"
---

# withPlatformString(_:)

Calls the given closure with a pointer to the contents of the file path root, represented as a null-terminated platform string.

## Declaration

```swift
func withPlatformString<Result>(_ body: (UnsafePointer<CInterop.PlatformChar>) throws -> Result) rethrows -> Result
```

## Parameters

- `body`: A closure with a pointer parameter that points to a null-terminated platform string. If body has a return value, that value is also used as the return value for this method.

## Return Value

Return Value The return value, if any, of the body closure parameter.

## Discussion

Discussion If the path has a relative portion, an allocation will occur in order to add the null terminator. The pointer passed as an argument to body is valid only during the execution of this method. Don’t try to store the pointer for later use.