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Fixes issue with wrong numbers printing to console in csound for iOS #97

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Fixes issue with wrong numbers printing to console in csound for iOS #97

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9 changes: 3 additions & 6 deletions book/12-d-csound-in-ios.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1008,19 +1008,16 @@ The process demonstrated in the code examples below can be described as:
}
```

Note that in Swift, we have to create a `CVaListPointer` (equivalent to a
`va_list *` in C) for use with the `vsnprintf()` function:


```swift
// Swift
func messageCallback(_ infoObj: NSValue) {
var info = Message()
infoObj.getValue(&info)
let message = UnsafeMutablePointer<Int8>.allocate(capacity: 1024)
let va_ptr: CVaListPointer = CVaListPointer(
_fromUnsafeMutablePointer: &(info.valist)
)
vsnprintf(message, 1024, info.format, va_ptr)

vsnprintf(message, 1024, info.format, info.valist)
let messageStr = String(cString: message)
print(messageStr)
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@jase5 jase5 Sep 28, 2024 •
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Also, the memory for buffer should be deallocated in the end to prevent excessive memory use:
message?.deallocate()

}
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