specs: Handle in/out parameters more consistently.

6 files changed, 19 insertions, 19 deletions

diff --git a/specs/d3d10.py b/specs/d3d10.py
index fcf424ef..29018c12 100644
--- a/specs/d3d10.py
+++ b/specs/d3d10.py
@@ -754,7 +754,7 @@ ID3D10Multithread = Interface("ID3D10Multithread", IUnknown)
 
 ID3D10DeviceChild.methods += [
     StdMethod(Void, "GetDevice", [Out(Pointer(ObjPointer(ID3D10Device)), "ppDevice")]),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), Out(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), InOut(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "guid"), (UINT, "DataSize"), (OpaqueBlob(Const(Void), "DataSize"), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateDataInterface", [(REFGUID, "guid"), (OpaquePointer(Const(IUnknown)), "pData")], sideeffects=False),
 ]
@@ -900,7 +900,7 @@ ID3D10Device.methods += [
     StdMethod(HRESULT, "GetDeviceRemovedReason", [], sideeffects=False),
     StdMethod(HRESULT, "SetExceptionMode", [(D3D10_RAISE_FLAG, "RaiseFlags")]),
     StdMethod(D3D10_RAISE_FLAG, "GetExceptionMode", [], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), Out(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), InOut(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "guid"), (UINT, "DataSize"), (OpaqueBlob(Const(Void), "DataSize"), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateDataInterface", [(REFGUID, "guid"), (OpaquePointer(Const(IUnknown)), "pData")], sideeffects=False),
     StdMethod(Void, "ClearState", []),
diff --git a/specs/d3d11.py b/specs/d3d11.py
index 10e9e69e..f9658ace 100644
--- a/specs/d3d11.py
+++ b/specs/d3d11.py
@@ -334,7 +334,7 @@ D3D11_BOX = Struct("D3D11_BOX", [
 
 ID3D11DeviceChild.methods += [
     StdMethod(Void, "GetDevice", [Out(Pointer(ObjPointer(ID3D11Device)), "ppDevice")]),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), Out(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), InOut(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "guid"), (UINT, "DataSize"), (OpaqueBlob(Const(Void), "DataSize"), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateDataInterface", [(REFGUID, "guid"), (OpaquePointer(Const(IUnknown)), "pData")], sideeffects=False),
 ]
@@ -1221,15 +1221,15 @@ ID3D11DeviceContext.methods += [
     StdMethod(Void, "CSSetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), (Array(Const(ObjPointer(ID3D11Buffer)), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "VSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "PSGetShaderResources", [(UINT, "StartSlot"), (UINT, "NumViews"), Out(Array(ObjPointer(ID3D11ShaderResourceView), "NumViews"), "ppShaderResourceViews")]),
-    StdMethod(Void, "PSGetShader", [Out(Pointer(ObjPointer(ID3D11PixelShader)), "ppPixelShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "PSGetShader", [Out(Pointer(ObjPointer(ID3D11PixelShader)), "ppPixelShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "PSGetSamplers", [(UINT, "StartSlot"), (UINT, "NumSamplers"), Out(Array(ObjPointer(ID3D11SamplerState), "NumSamplers"), "ppSamplers")]),
-    StdMethod(Void, "VSGetShader", [Out(Pointer(ObjPointer(ID3D11VertexShader)), "ppVertexShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "VSGetShader", [Out(Pointer(ObjPointer(ID3D11VertexShader)), "ppVertexShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "PSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "IAGetInputLayout", [Out(Pointer(ObjPointer(ID3D11InputLayout)), "ppInputLayout")]),
     StdMethod(Void, "IAGetVertexBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppVertexBuffers"), Out(Array(UINT, "NumBuffers"), "pStrides"), Out(Array(UINT, "NumBuffers"), "pOffsets")]),
     StdMethod(Void, "IAGetIndexBuffer", [Out(Pointer(ObjPointer(ID3D11Buffer)), "pIndexBuffer"), Out(Pointer(DXGI_FORMAT), "Format"), Out(Pointer(UINT), "Offset")]),
     StdMethod(Void, "GSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
-    StdMethod(Void, "GSGetShader", [Out(Pointer(ObjPointer(ID3D11GeometryShader)), "ppGeometryShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "GSGetShader", [Out(Pointer(ObjPointer(ID3D11GeometryShader)), "ppGeometryShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "IAGetPrimitiveTopology", [Out(Pointer(D3D11_PRIMITIVE_TOPOLOGY), "pTopology")], sideeffects=False),
     StdMethod(Void, "VSGetShaderResources", [(UINT, "StartSlot"), (UINT, "NumViews"), Out(Array(ObjPointer(ID3D11ShaderResourceView), "NumViews"), "ppShaderResourceViews")]),
     StdMethod(Void, "VSGetSamplers", [(UINT, "StartSlot"), (UINT, "NumSamplers"), Out(Array(ObjPointer(ID3D11SamplerState), "NumSamplers"), "ppSamplers")]),
@@ -1245,16 +1245,16 @@ ID3D11DeviceContext.methods += [
     StdMethod(Void, "RSGetViewports", [InOut(Pointer(UINT), "pNumViewports"), Out(Array(D3D11_VIEWPORT, "*pNumViewports"), "pViewports")], sideeffects=False),
     StdMethod(Void, "RSGetScissorRects", [InOut(Pointer(UINT), "pNumRects"), Out(Array(D3D11_RECT, "*pNumRects"), "pRects")], sideeffects=False),
     StdMethod(Void, "HSGetShaderResources", [(UINT, "StartSlot"), (UINT, "NumViews"), Out(Array(ObjPointer(ID3D11ShaderResourceView), "NumViews"), "ppShaderResourceViews")]),
-    StdMethod(Void, "HSGetShader", [Out(Pointer(ObjPointer(ID3D11HullShader)), "ppHullShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "HSGetShader", [Out(Pointer(ObjPointer(ID3D11HullShader)), "ppHullShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "HSGetSamplers", [(UINT, "StartSlot"), (UINT, "NumSamplers"), Out(Array(ObjPointer(ID3D11SamplerState), "NumSamplers"), "ppSamplers")]),
     StdMethod(Void, "HSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "DSGetShaderResources", [(UINT, "StartSlot"), (UINT, "NumViews"), Out(Array(ObjPointer(ID3D11ShaderResourceView), "NumViews"), "ppShaderResourceViews")]),
-    StdMethod(Void, "DSGetShader", [Out(Pointer(ObjPointer(ID3D11DomainShader)), "ppDomainShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "DSGetShader", [Out(Pointer(ObjPointer(ID3D11DomainShader)), "ppDomainShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "DSGetSamplers", [(UINT, "StartSlot"), (UINT, "NumSamplers"), Out(Array(ObjPointer(ID3D11SamplerState), "NumSamplers"), "ppSamplers")]),
     StdMethod(Void, "DSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "CSGetShaderResources", [(UINT, "StartSlot"), (UINT, "NumViews"), Out(Array(ObjPointer(ID3D11ShaderResourceView), "NumViews"), "ppShaderResourceViews")]),
     StdMethod(Void, "CSGetUnorderedAccessViews", [(UINT, "StartSlot"), (UINT, "NumUAVs"), Out(Array(ObjPointer(ID3D11UnorderedAccessView), "NumUAVs"), "ppUnorderedAccessViews")]),
-    StdMethod(Void, "CSGetShader", [Out(Pointer(ObjPointer(ID3D11ComputeShader)), "ppComputeShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), Out(Pointer(UINT), "pNumClassInstances")]),
+    StdMethod(Void, "CSGetShader", [Out(Pointer(ObjPointer(ID3D11ComputeShader)), "ppComputeShader"), Out(Array(ObjPointer(ID3D11ClassInstance), "*pNumClassInstances"), "ppClassInstances"), InOut(Pointer(UINT), "pNumClassInstances")]),
     StdMethod(Void, "CSGetSamplers", [(UINT, "StartSlot"), (UINT, "NumSamplers"), Out(Array(ObjPointer(ID3D11SamplerState), "NumSamplers"), "ppSamplers")]),
     StdMethod(Void, "CSGetConstantBuffers", [(UINT, "StartSlot"), (UINT, "NumBuffers"), Out(Array(ObjPointer(ID3D11Buffer), "NumBuffers"), "ppConstantBuffers")]),
     StdMethod(Void, "ClearState", []),
@@ -1304,7 +1304,7 @@ ID3D11Device.methods += [
     StdMethod(Void, "CheckCounterInfo", [Out(Pointer(D3D11_COUNTER_INFO), "pCounterInfo")], sideeffects=False),
     StdMethod(HRESULT, "CheckCounter", [(Pointer(Const(D3D11_COUNTER_DESC)), "pDesc"), Out(Pointer(D3D11_COUNTER_TYPE), "pType"), Out(Pointer(UINT), "pActiveCounters"), Out(LPSTR, "szName"), Out(Pointer(UINT), "pNameLength"), Out(LPSTR, "szUnits"), Out(Pointer(UINT), "pUnitsLength"), Out(LPSTR, "szDescription"), Out(Pointer(UINT), "pDescriptionLength")], sideeffects=False),
     StdMethod(HRESULT, "CheckFeatureSupport", [(D3D11_FEATURE, "Feature"), Out(D3D11_FEATURE_DATA, "pFeatureSupportData"), (UINT, "FeatureSupportDataSize")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), Out(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "guid"), InOut(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "guid"), (UINT, "DataSize"), (OpaqueBlob(Const(Void), "DataSize"), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateDataInterface", [(REFGUID, "guid"), (OpaquePointer(Const(IUnknown)), "pData")], sideeffects=False),
     StdMethod(D3D_FEATURE_LEVEL, "GetFeatureLevel", [], sideeffects=False),
diff --git a/specs/d3d8.py b/specs/d3d8.py
index 1166ea49..d6b466b0 100644
--- a/specs/d3d8.py
+++ b/specs/d3d8.py
@@ -227,7 +227,7 @@ IDirect3DSwapChain8.methods += [
 IDirect3DResource8.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE8), "ppDevice")]),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "refguid"), (OpaqueBlob(Const(Void), "SizeOfData"), "pData"), (DWORD, "SizeOfData"), (D3DSPD, "Flags")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), Out(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), InOut(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
     StdMethod(HRESULT, "FreePrivateData", [(REFGUID, "refguid")], sideeffects=False),
     StdMethod(DWORD, "SetPriority", [(DWORD, "PriorityNew")]),
     StdMethod(DWORD, "GetPriority", [], sideeffects=False),
@@ -280,7 +280,7 @@ IDirect3DIndexBuffer8.methods += [
 IDirect3DSurface8.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE8), "ppDevice")]),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "refguid"), (OpaqueBlob(Const(Void), "SizeOfData"), "pData"), (DWORD, "SizeOfData"), (D3DSPD, "Flags")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), Out(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), InOut(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
     StdMethod(HRESULT, "FreePrivateData", [(REFGUID, "refguid")], sideeffects=False),
     StdMethod(HRESULT, "GetContainer", [(REFIID, "riid"), Out(Pointer(ObjPointer(Void)), "ppContainer")]),
     StdMethod(HRESULT, "GetDesc", [Out(Pointer(D3DSURFACE_DESC), "pDesc")], sideeffects=False),
@@ -291,7 +291,7 @@ IDirect3DSurface8.methods += [
 IDirect3DVolume8.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE8), "ppDevice")]),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "refguid"), (OpaqueBlob(Const(Void), "SizeOfData"), "pData"), (DWORD, "SizeOfData"), (D3DSPD, "Flags")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), Out(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), InOut(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
     StdMethod(HRESULT, "FreePrivateData", [(REFGUID, "refguid")], sideeffects=False),
     StdMethod(HRESULT, "GetContainer", [(REFIID, "riid"), Out(Pointer(ObjPointer(Void)), "ppContainer")]),
     StdMethod(HRESULT, "GetDesc", [Out(Pointer(D3DVOLUME_DESC), "pDesc")], sideeffects=False),
diff --git a/specs/d3d9.py b/specs/d3d9.py
index 5530ccb0..8cd8ccad 100644
--- a/specs/d3d9.py
+++ b/specs/d3d9.py
@@ -290,7 +290,7 @@ IDirect3DSwapChain9.methods += [
 IDirect3DResource9.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE9), "ppDevice")]),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "refguid"), (OpaqueBlob(Const(Void), "SizeOfData"), "pData"), (DWORD, "SizeOfData"), (D3DSPD, "Flags")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), Out(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), InOut(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
     StdMethod(HRESULT, "FreePrivateData", [(REFGUID, "refguid")], sideeffects=False),
     StdMethod(D3D9_RESOURCE_PRIORITY, "SetPriority", [(D3D9_RESOURCE_PRIORITY, "PriorityNew")]),
     StdMethod(D3D9_RESOURCE_PRIORITY, "GetPriority", [], sideeffects=False),
@@ -300,7 +300,7 @@ IDirect3DResource9.methods += [
 
 IDirect3DVertexDeclaration9.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE9), "ppDevice")]),
-    StdMethod(HRESULT, "GetDeclaration", [Out(Array(D3DVERTEXELEMENT9, "*pNumElements"), "pElement"), Out(Pointer(UINT), "pNumElements")], sideeffects=False),
+    StdMethod(HRESULT, "GetDeclaration", [Out(Array(D3DVERTEXELEMENT9, "*pNumElements"), "pElement"), InOut(Pointer(UINT), "pNumElements")], sideeffects=False),
 ]
 
 IDirect3DVertexShader9.methods += [
@@ -370,7 +370,7 @@ IDirect3DSurface9.methods += [
 IDirect3DVolume9.methods += [
     StdMethod(HRESULT, "GetDevice", [Out(Pointer(PDIRECT3DDEVICE9), "ppDevice")]),
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "refguid"), (OpaqueBlob(Const(Void), "SizeOfData"), "pData"), (DWORD, "SizeOfData"), (D3DSPD, "Flags")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), Out(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "refguid"), Out(OpaqueBlob(Void, "*pSizeOfData"), "pData"), InOut(Pointer(DWORD), "pSizeOfData")], sideeffects=False),
     StdMethod(HRESULT, "FreePrivateData", [(REFGUID, "refguid")], sideeffects=False),
     StdMethod(HRESULT, "GetContainer", [(REFIID, "riid"), Out(Pointer(ObjPointer(Void)), "ppContainer")]),
     StdMethod(HRESULT, "GetDesc", [Out(Pointer(D3DVOLUME_DESC), "pDesc")], sideeffects=False),
diff --git a/specs/ddraw.py b/specs/ddraw.py
index 1b224763..114fc4fa 100644
--- a/specs/ddraw.py
+++ b/specs/ddraw.py
@@ -1553,7 +1553,7 @@ IDirectDrawSurface4.methods += [
     StdMethod(DDRESULT, "PageUnlock", [(DWORD, "dwFlags")]),
     StdMethod(DDRESULT, "SetSurfaceDesc", [(LPDDSURFACEDESC2, "lpDDSD"), (DWORD, "dwFlags")]),
     StdMethod(DDRESULT, "SetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), (DWORD, "cbSize"), (DWORD, "dwFlags")]),
-    StdMethod(DDRESULT, "GetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), Out(LPDWORD, "lpcbBufferSize")]),
+    StdMethod(DDRESULT, "GetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), InOut(LPDWORD, "lpcbBufferSize")]),
     StdMethod(DDRESULT, "FreePrivateData", [(REFGUID, "guidTag")]),
     StdMethod(DDRESULT, "GetUniquenessValue", [Out(LPDWORD, "lpValue")]),
     StdMethod(DDRESULT, "ChangeUniquenessValue", []),
@@ -1598,7 +1598,7 @@ IDirectDrawSurface7.methods += [
     StdMethod(DDRESULT, "PageUnlock", [(DWORD, "dwFlags")]),
     StdMethod(DDRESULT, "SetSurfaceDesc", [(LPDDSURFACEDESC2, "lpDDSD"), (DWORD, "dwFlags")]),
     StdMethod(DDRESULT, "SetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), (DWORD, "cbSize"), (DWORD, "dwFlags")]),
-    StdMethod(DDRESULT, "GetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), Out(LPDWORD, "lpcbBufferSize")]),
+    StdMethod(DDRESULT, "GetPrivateData", [(REFGUID, "guidTag"), (LPVOID, "lpData"), InOut(LPDWORD, "lpcbBufferSize")]),
     StdMethod(DDRESULT, "FreePrivateData", [(REFGUID, "guidTag")]),
     StdMethod(DDRESULT, "GetUniquenessValue", [Out(LPDWORD, "lpValue")]),
     StdMethod(DDRESULT, "ChangeUniquenessValue", []),
diff --git a/specs/dxgi.py b/specs/dxgi.py
index 89153990..5f30ac44 100644
--- a/specs/dxgi.py
+++ b/specs/dxgi.py
@@ -142,7 +142,7 @@ DXGI_SWAP_CHAIN_DESC = Struct("DXGI_SWAP_CHAIN_DESC", [
 IDXGIObject.methods += [
     StdMethod(HRESULT, "SetPrivateData", [(REFGUID, "Name"), (UINT, "DataSize"), (OpaqueBlob(Const(Void), "DataSize"), "pData")], sideeffects=False),
     StdMethod(HRESULT, "SetPrivateDataInterface", [(REFGUID, "Name"), (OpaquePointer(Const(IUnknown)), "pUnknown")], sideeffects=False),
-    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "Name"), Out(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
+    StdMethod(HRESULT, "GetPrivateData", [(REFGUID, "Name"), InOut(Pointer(UINT), "pDataSize"), Out(OpaquePointer(Void), "pData")], sideeffects=False),
     StdMethod(HRESULT, "GetParent", [(REFIID, "riid"), Out(Pointer(ObjPointer(Void)), "ppParent")]),
 ]