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devicescale: Use more runtime.KeepAlive for Windows

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This commit is contained in:
Hajime Hoshi 2019-04-03 11:57:00 +09:00
parent 8005682786
commit 0d0b347411
1 changed files with 5 additions and 3 deletions
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8
internal/devicescale/impl_windows.go
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@ -172,8 +172,10 @@ func getMonitorInfo(hMonitor uintptr, lpMonitorInfo uintptr) error {
return nil return nil
} }
func getDpiForMonitor(hMonitor uintptr, dpiType uintptr, dpiX, dpiY uintptr) error { func getDpiForMonitor(hMonitor uintptr, dpiType uintptr, dpiX, dpiY *uint32) error {
r, _, e := procGetDpiForMonitor.Call(hMonitor, dpiType, dpiX, dpiY) r, _, e := procGetDpiForMonitor.Call(hMonitor, dpiType, uintptr(unsafe.Pointer(dpiX)), uintptr(unsafe.Pointer(dpiY)))
runtime.KeepAlive(dpiX)
runtime.KeepAlive(dpiY)
if e != nil && e.(windows.Errno) != 0 { if e != nil && e.(windows.Errno) != 0 {
return &winErr{ return &winErr{
FuncName: "GetDpiForMonitor", FuncName: "GetDpiForMonitor",
@ -247,7 +249,7 @@ func impl(x, y int) float64 {
dpiX := uint32(0) dpiX := uint32(0)
dpiY := uint32(0) // Passing dpiY is needed even though this is not used. dpiY := uint32(0) // Passing dpiY is needed even though this is not used.
if err := getDpiForMonitor(m, mdtEffectiveDpi, uintptr(unsafe.Pointer(&dpiX)), uintptr(unsafe.Pointer(&dpiY))); err != nil { if err := getDpiForMonitor(m, mdtEffectiveDpi, &dpiX, &dpiY); err != nil {
panic(err) panic(err)
} }
return float64(dpiX) / 96 return float64(dpiX) / 96