public static bool IsApiAvailable(string libName, string procName)
{
bool value = false;
if (!string.IsNullOrEmpty(libName) && !string.IsNullOrEmpty(procName))
{
Tuple <string, string> key = new Tuple <string, string>(libName, procName);
if (availableApis.TryGetValue(key, out value))
{
return(value);
}
IntPtr intPtr = CommonUnsafeNativeMethods.LoadLibraryFromSystemPathIfAvailable(libName);
if (intPtr != IntPtr.Zero)
{
IntPtr procAddress = CommonUnsafeNativeMethods.GetProcAddress(new HandleRef(value, intPtr), procName);
if (procAddress != IntPtr.Zero)
{
value = true;
}
}
CommonUnsafeNativeMethods.FreeLibrary(new HandleRef(value, intPtr));
availableApis[key] = value;
}
return(value);
}
/// <summary>
/// Enters given Dpi awareness scope
/// </summary>
public DpiAwarenessScope(DpiAwarenessContext awareness)
{
if (EnableDpiChangedHighDpiImprovements)
{
try
{
if (!CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(awareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNSPECIFIED))
{
originalAwareness = CommonUnsafeNativeMethods.GetThreadDpiAwarenessContext();
// If current process dpiawareness is SYSTEM_UNAWARE or SYSTEM_AWARE (must be equal to awareness), calling this method will be a no-op.
if (!CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(originalAwareness, awareness) &&
!CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(originalAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNAWARE))
{
originalAwareness = CommonUnsafeNativeMethods.SetThreadDpiAwarenessContext(awareness);
dpiAwarenessScopeIsSet = true;
}
}
}
catch (EntryPointNotFoundException)
{
dpiAwarenessScopeIsSet = false;
}
}
}
/// <summary>
/// resetting dpiawareness of the thread.
/// </summary>
private void ResetDpiAwarenessContextChanges()
{
if (dpiAwarenessScopeIsSet)
{
CommonUnsafeNativeMethods.TrySetThreadDpiAwarenessContext(originalAwareness);
dpiAwarenessScopeIsSet = false;
}
}
