From 4eecf242d526781ef7cc1b8da54fb08a71edf4ad Mon Sep 17 00:00:00 2001
From: Konstantin Aladyshev <aladyshev22@gmail.com>
Date: Sun, 11 Jul 2021 23:42:42 +0300
Subject: Add draft for lesson 38

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
---
 .../SimpleClassUser/SimpleClassUser.c              | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.c

(limited to 'Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.c')

diff --git a/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.c b/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.c
new file mode 100644
index 0000000..bd3ac1d
--- /dev/null
+++ b/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.c
@@ -0,0 +1,67 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/SimpleClass.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINTN                  HandleCount;
+  EFI_HANDLE*            HandleBuffer;
+  UINTN Index;
+  SIMPLE_CLASS_PROTOCOL* SimpleClass;
+
+  EFI_STATUS Status = gBS->LocateHandleBuffer (
+                  ByProtocol,
+                  &gSimpleClassProtocolGuid,
+                  NULL,
+                  &HandleCount,
+                  &HandleBuffer
+                  );
+  if (EFI_ERROR (Status)) {
+    Print(L"Error! Can't find any handle with gSimpleClassProtocolGuid: %r\n", Status);
+    return Status;
+  }
+
+  for (Index = 0; Index < HandleCount; Index++) {
+    Print(L"Handle = %p\n", HandleBuffer[Index]);
+    Status = gBS->OpenProtocol(
+      HandleBuffer[Index],
+      &gSimpleClassProtocolGuid,
+      (VOID **)&SimpleClass,
+      ImageHandle,
+      NULL,
+      EFI_OPEN_PROTOCOL_GET_PROTOCOL
+    );
+
+    if (!EFI_ERROR(Status)) {
+      UINTN Number;
+
+      Status = SimpleClass->GetNumber(&Number);
+      if (!EFI_ERROR(Status)) {
+        Print(L"Number before=%d\n", Number);
+      } else {
+        Print(L"Error! Can't get number: %r\n", Status);
+      }
+
+      Status = SimpleClass->SetNumber(Number+5);
+      if (EFI_ERROR(Status))
+        Print(L"Error! Can't set number: %r\n", Status);
+
+      Status = SimpleClass->GetNumber(&Number);
+      if (!EFI_ERROR(Status)) {
+        Print(L"Number after=%d\n", Number);
+      } else {
+        Print(L"Error! Can't get number: %r\n", Status);
+      }
+    } else {
+      Print(L"Error! Can't open SimpleClass protocol: %r\n", Status);
+    }
+  }
+
+  return Status;
+}
-- 
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