forked from jchv/go-webview2
/
module.go
107 lines (98 loc) · 3.07 KB
/
module.go
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package webviewloader
import (
"fmt"
"sync"
"unsafe"
"github.com/jchv/go-winloader"
"golang.org/x/sys/windows"
)
var (
nativeModule = windows.NewLazyDLL("WebView2Loader")
nativeCreate = nativeModule.NewProc("CreateCoreWebView2EnvironmentWithOptions")
nativeCompareBrowserVersions = nativeModule.NewProc("CompareBrowserVersions")
memOnce sync.Once
memModule winloader.Module
memCreate winloader.Proc
memCompareBrowserVersions winloader.Proc
memErr error
)
// CompareBrowserVersions will compare the 2 given versions and return:
// -1 = v1 < v2
// 0 = v1 == v2
// 1 = v1 > v2
func CompareBrowserVersions(v1 string, v2 string) (int, error) {
_v1, err := windows.UTF16PtrFromString(v1)
if err != nil {
return 0, err
}
_v2, err := windows.UTF16PtrFromString(v2)
if err != nil {
return 0, err
}
nativeErr := nativeModule.Load()
if nativeErr == nil {
nativeErr = nativeCompareBrowserVersions.Find()
}
var result int
if nativeErr != nil {
err := loadFromMemory(nativeErr)
if err != nil {
return 0, fmt.Errorf("Unable to load WebView2Loader.dll from disk: %v -- or from memory: %w", nativeErr, memErr)
}
_, _, err = memCompareBrowserVersions.Call(
uint64(uintptr(unsafe.Pointer(_v1))),
uint64(uintptr(unsafe.Pointer(_v2))),
uint64(uintptr(unsafe.Pointer(&result))))
} else {
_, _, err = nativeCompareBrowserVersions.Call(
uintptr(unsafe.Pointer(_v1)),
uintptr(unsafe.Pointer(_v2)),
uintptr(unsafe.Pointer(&result)))
}
if err != windows.ERROR_SUCCESS {
return result, err
}
return result, nil
}
// CreateCoreWebView2EnvironmentWithOptions tries to load WebviewLoader2 and
// call the CreateCoreWebView2EnvironmentWithOptions routine.
func CreateCoreWebView2EnvironmentWithOptions(browserExecutableFolder, userDataFolder *uint16, environmentOptions uintptr, environmentCompletedHandle uintptr) (uintptr, error) {
nativeErr := nativeModule.Load()
if nativeErr == nil {
nativeErr = nativeCreate.Find()
}
if nativeErr != nil {
err := loadFromMemory(nativeErr)
if err != nil {
return 0, err
}
res, _, _ := memCreate.Call(
uint64(uintptr(unsafe.Pointer(browserExecutableFolder))),
uint64(uintptr(unsafe.Pointer(userDataFolder))),
uint64(environmentOptions),
uint64(environmentCompletedHandle),
)
return uintptr(res), nil
}
res, _, _ := nativeCreate.Call(
uintptr(unsafe.Pointer(browserExecutableFolder)),
uintptr(unsafe.Pointer(userDataFolder)),
environmentOptions,
environmentCompletedHandle,
)
return res, nil
}
func loadFromMemory(nativeErr error) error {
var err error
// DLL is not available natively. Try loading embedded copy.
memOnce.Do(func() {
memModule, memErr = winloader.LoadFromMemory(WebView2Loader)
if memErr != nil {
err = fmt.Errorf("Unable to load WebView2Loader.dll from disk: %v -- or from memory: %w", nativeErr, memErr)
return
}
memCreate = memModule.Proc("CreateCoreWebView2EnvironmentWithOptions")
memCompareBrowserVersions = memModule.Proc("CompareBrowserVersions")
})
return err
}