Add draft for lesson 38

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

2 files changed, 89 insertions, 0 deletions

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;
+}
diff --git a/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.inf b/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.inf
new file mode 100644
index 0000000..cb57e68
--- /dev/null
+++ b/Lessons/Lesson_38/UefiLessonsPkg/SimpleClassUser/SimpleClassUser.inf
@@ -0,0 +1,22 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SimpleClassUser
+  FILE_GUID                      = 466eed70-8def-44ea-9fb4-9012b266ec8c
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  SimpleClassUser.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiLessonsPkg/UefiLessonsPkg.dec
+
+[Protocols]
+  gSimpleClassProtocolGuid
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+