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TDx_Input_Library v2.00 Component Reference
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[ TDx_Input_Library::TDIPropHeader ] [ next: TDIPropRange ] [ prev: TDIPropGuidAndPath ] class TDIPropHeader : public TComponent
class PACKAGE TDIPropHeader : public TComponent
class type : Wrapper
TDIPROPHEADER
[ component ]
The TDIPropHeader component wraps the DirectX DIPROPHEADER structure which is located at the start of all TDIProperty-derived components internal structures, in a structure-in-structure relationship. These TDIProperty-derived components are TDIPropDWORD, TDIPropGuidAndPath, TDIPropRange and TDIPropString, which wrap the various DIPROPDWORD, DIGUIDANDPATH, DIPROPRANGE and DIPROPSTRING structures. Each of these internal structures contains a DIPROPHEADER structure which is used to define the size of the encapsulating structure and how the data within the encapsulating structure should be interpreted. This structure also defines a special-purpose dwSize member, usually maintained with manual code. To automatically maintain this dwSize member and to access all relevant information within these TDIProperty components, link a TDIPropHeader component using the relevant TDIPropDWORD::PropHeader, TDIPropGuidAndPath::PropHeader, TDIPropRange::PropHeader and TDIPropString::PropHeader properties. During linking, the TDIPropHeader::Size property is automatically set to the TDIProperty's Size property. Example code that sets a property :- DIPropHeader1->Obj = 0; DIPropHeader1->How = DIPH_DEVICE; DIPropDWORD1->PropHeader = DIPropHeader1; DIPropDWORD1->Data = 10; Dx_InputDevice1->SetProperty( DIPROP_BUFFERSIZE, DIPropDWORD1 ); You can also access the contents of the TDIPropDWORD's internal DIPROPHEADER structure using standard vcl code like :- DIPropDWORD1->PropHeader = DIPropHeader1; DIPropDWORD1->PropHeader->Obj = 0; DIPropDWORD1->PropHeader->How = DIPH_DEVICE; DIPropDWORD1->Data = 10; Dx_InputDevice1->SetProperty( DIPROP_BUFFERSIZE, DIPropDWORD1 ); After linking and setting up the relevant details, pass the TDIProperty-derived component into TDx_InputDevice::GetProperty() and TDx_InputDevice::SetProperty() to perform a range of property related operations on an input device or object. TDx_InputDevice::GetProperty() TDx_InputDevice::SetProperty() TDIPropDWORD::PropHeader TDIPropRange::PropHeader TDIPropString::PropHeader TDIPropGuidAndPath::PropHeader If you would like to submit additions or improvements to this page, click: darren_john_dwyer@hotmail.com. |
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