Add Example for EFI_BROWSER_ACTION_RETRIEVE callback

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9426 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 18 insertions, 2 deletions

diff --git a/MdeModulePkg/Universal/DriverSampleDxe/DriverSample.c b/MdeModulePkg/Universal/DriverSampleDxe/DriverSample.c
index a3aa2511bc..d40d60d663 100644
--- a/MdeModulePkg/Universal/DriverSampleDxe/DriverSample.c
+++ b/MdeModulePkg/Universal/DriverSampleDxe/DriverSample.c
@@ -556,6 +556,7 @@ DriverCallback (
   EFI_IFR_GUID_LABEL              *EndLabel;

   EFI_INPUT_KEY                   Key;

   DRIVER_SAMPLE_CONFIGURATION     *Configuration;

+  UINTN                           MyVarSize;

 

   if (Action == EFI_BROWSER_ACTION_FORM_OPEN) {

     //

@@ -624,7 +625,6 @@ DriverCallback (
     return EFI_INVALID_PARAMETER;

   }

 

-

   Status = EFI_SUCCESS;

   PrivateData = DRIVER_SAMPLE_PRIVATE_FROM_THIS (This);

 

@@ -821,12 +821,13 @@ DriverCallback (
     // Change an EFI Variable storage (MyEfiVar) asynchronous, this will cause

     // the first statement in Form 3 be suppressed

     //

+    MyVarSize = 1;

     MyVar = 111;

     Status = gRT->SetVariable(

                     L"MyVar",

                     &mFormSetGuid,

                     EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,

-                    1,

+                    MyVarSize,

                     &MyVar

                     );

     break;

@@ -870,6 +871,21 @@ DriverCallback (
 

     break;

 

+  case 0x1111:

+    //

+    // EfiVarstore question takes sample action (print value as debug information) 

+    // after read/write question.

+    //

+    MyVarSize = 1;

+    Status = gRT->GetVariable(

+                    L"MyVar",

+                    &mFormSetGuid,

+                    NULL,

+                    &MyVarSize,

+                    &MyVar

+                    );

+    ASSERT_EFI_ERROR (Status);

+    DEBUG ((DEBUG_INFO, "EfiVarstore question: Tall value is %d with value width %d\n", MyVar, MyVarSize));

   default:

     break;

   }