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Delete unnecessary spaces #2693

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changeworld Feb 20, 2019
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266 changes: 133 additions & 133 deletions docs/extensibility/debugger/reference/idebuggenericparamfield-getconstraints.md
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title: "IDebugGenericParamField::GetConstraints | Microsoft Docs"
ms.date: "11/04/2016"
ms.topic: "conceptual"
helpviewer_keywords:
helpviewer_keywords:
- "IDebugGenericParamField::GetConstraints"
- "GetConstraints"
ms.assetid: 86a78b5a-ee0f-4999-a0ba-919d3dc7d969
author: "gregvanl"
ms.author: "gregvanl"
manager: jillfra
ms.workload:
ms.workload:
- "vssdk"
---
# IDebugGenericParamField::GetConstraints
Retrieves the constraints that are associated with this generic parameter.
## Syntax
```cpp
HRESULT GetConstraints(
ULONG32 cConstraints,
IDebugField** ppConstraints,
ULONG32* pcConstraints
);
```
```csharp
int GetConstraints(
uint cConstraints,
out IDebugField[] ppConstraints,
ref uint pcConstraints
);
```
#### Parameters
`cConstraints`
[in] Number of constraints.
`ppConstraints`
[out] Returns an array that contains the constraints associated with this field.
`pcConstraints`
[in, out] Number of constraints in the `ppConstraints` array.
## Return Value
If successful, returns `S_OK`; otherwise, returns an error code.
## Example
The following example shows how to implement this method for a **CDebugGenericParamFieldType** object that exposes the [IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md) interface.
```cpp
HRESULT CDebugGenericParamFieldType::GetConstraints(
ULONG32 cConstraints,
IDebugField** ppConstraints,
ULONG32* pcConstraints)
{
HRESULT hr = S_OK;
CComPtr<IMetaDataImport> pMetadata;
CComPtr<IMetaDataImport2> pMetadata2;
mdGenericParamConstraint* rgParamConsts = NULL;
HCORENUM hEnum = 0;
ULONG cConst = 0;
ULONG iConst;
ULONG iConstOut = 0;
METHOD_ENTRY( CDebugGenericParamFieldType::GetConstraints );
IfFalseGo(ppConstraints && pcConstraints, E_INVALIDARG );
*pcConstraints = 0;
IfNullGo( rgParamConsts = new mdGenericParamConstraint[cConstraints], E_OUTOFMEMORY);
IfFailGo( m_spSH->GetMetadata( m_idModule, &pMetadata ) );
IfFailGo( pMetadata->QueryInterface(IID_IMetaDataImport2, (void**)&pMetadata2) );
IfFailGo( pMetadata2->EnumGenericParamConstraints( &hEnum,
m_tokParam,
rgParamConsts,
cConstraints,
&cConst) );
pMetadata->CloseEnum(hEnum);
hEnum = NULL;
for (iConst = 0; iConst < cConst; iConst++)
{
mdToken tokConst;
IfFailGo( pMetadata2->GetGenericParamConstraintProps( rgParamConsts[iConst],
NULL,
&tokConst ) );
switch (TypeFromToken(tokConst))
{
case mdtTypeRef:
{
Module_ID mid;
mdTypeDef tokClass;
IfFailGo( CDebugClassFieldType::GetClassToken(m_spSH, m_idModule, tokConst, &mid, &tokClass) );
IfFailGo( m_spSH->CreateClassType( mid, tokClass, ppConstraints + iConstOut ) );
iConstOut++;
break;
}
case mdtTypeDef:
{
IfFailGo( m_spSH->CreateClassType( m_idModule, tokConst, ppConstraints + iConstOut ) );
iConstOut++;
break;
}
case mdtTypeSpec:
{
PCCOR_SIGNATURE pvSig;
ULONG cbSig;
DWORD cb = 0;
DWORD dwElementType;
IfFailGo( pMetadata2->GetTypeSpecFromToken( tokConst, &pvSig, &cbSig) );
cb += CorSigUncompressData(&(pvSig[cb]), &dwElementType);
IfFailGo( m_spSH->CreateType( pvSig, cbSig, m_idModule, mdMethodDefNil, m_pGenScope, ppConstraints + iConstOut ) );
iConstOut++;
break;
}
default:
{
ASSERT(!"Bad constraint token");
}
}
}
*pcConstraints = iConstOut;
Error:
METHOD_EXIT( CDebugGenericParamFieldType::GetConstraints, hr );
DELETERG(rgParamConsts);
return hr;
}
```
## See Also
[IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md)
Retrieves the constraints that are associated with this generic parameter.

## Syntax

```cpp
HRESULT GetConstraints(
ULONG32 cConstraints,
IDebugField** ppConstraints,
ULONG32* pcConstraints
);
```

```csharp
int GetConstraints(
uint cConstraints,
out IDebugField[] ppConstraints,
ref uint pcConstraints
);
```

#### Parameters
`cConstraints`
[in] Number of constraints.

`ppConstraints`
[out] Returns an array that contains the constraints associated with this field.

`pcConstraints`
[in, out] Number of constraints in the `ppConstraints` array.

## Return Value
If successful, returns `S_OK`; otherwise, returns an error code.

## Example
The following example shows how to implement this method for a **CDebugGenericParamFieldType** object that exposes the [IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md) interface.

```cpp
HRESULT CDebugGenericParamFieldType::GetConstraints(
ULONG32 cConstraints,
IDebugField** ppConstraints,
ULONG32* pcConstraints)
{
HRESULT hr = S_OK;
CComPtr<IMetaDataImport> pMetadata;
CComPtr<IMetaDataImport2> pMetadata2;
mdGenericParamConstraint* rgParamConsts = NULL;
HCORENUM hEnum = 0;
ULONG cConst = 0;
ULONG iConst;
ULONG iConstOut = 0;

METHOD_ENTRY( CDebugGenericParamFieldType::GetConstraints );

IfFalseGo(ppConstraints && pcConstraints, E_INVALIDARG );
*pcConstraints = 0;

IfNullGo( rgParamConsts = new mdGenericParamConstraint[cConstraints], E_OUTOFMEMORY);

IfFailGo( m_spSH->GetMetadata( m_idModule, &pMetadata ) );
IfFailGo( pMetadata->QueryInterface(IID_IMetaDataImport2, (void**)&pMetadata2) );
IfFailGo( pMetadata2->EnumGenericParamConstraints( &hEnum,
m_tokParam,
rgParamConsts,
cConstraints,
&cConst) );
pMetadata->CloseEnum(hEnum);
hEnum = NULL;

for (iConst = 0; iConst < cConst; iConst++)
{
mdToken tokConst;

IfFailGo( pMetadata2->GetGenericParamConstraintProps( rgParamConsts[iConst],
NULL,
&tokConst ) );
switch (TypeFromToken(tokConst))
{
case mdtTypeRef:
{
Module_ID mid;
mdTypeDef tokClass;

IfFailGo( CDebugClassFieldType::GetClassToken(m_spSH, m_idModule, tokConst, &mid, &tokClass) );
IfFailGo( m_spSH->CreateClassType( mid, tokClass, ppConstraints + iConstOut ) );
iConstOut++;
break;
}
case mdtTypeDef:
{
IfFailGo( m_spSH->CreateClassType( m_idModule, tokConst, ppConstraints + iConstOut ) );
iConstOut++;
break;
}
case mdtTypeSpec:
{
PCCOR_SIGNATURE pvSig;
ULONG cbSig;
DWORD cb = 0;
DWORD dwElementType;

IfFailGo( pMetadata2->GetTypeSpecFromToken( tokConst, &pvSig, &cbSig) );

cb += CorSigUncompressData(&(pvSig[cb]), &dwElementType);

IfFailGo( m_spSH->CreateType( pvSig, cbSig, m_idModule, mdMethodDefNil, m_pGenScope, ppConstraints + iConstOut ) );

iConstOut++;

break;
}
default:
{
ASSERT(!"Bad constraint token");
}
}
}

*pcConstraints = iConstOut;

Error:

METHOD_EXIT( CDebugGenericParamFieldType::GetConstraints, hr );

DELETERG(rgParamConsts);

return hr;
}
```

## See Also
[IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md)