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RAD Studio VCL Reference
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TCanvas.HandleAllocated Method
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RAD Studio VCL Reference
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Indicates whether the TCanvas object has acquired a handle to a device context.
function HandleAllocated: Boolean;
__fastcall Boolean HandleAllocated();
Use HandleAllocated to determine whether the Handle property is set to an HDC value. HandleAllocated indicates whether the canvas has acquired a device context. Use HandleAllocated rather than reading the Handle property. When an application reads the Handle property, TCanvas automatically allocates a new device context and returns its handle if the property had not been previously set.
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