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ERROR_GRAPHICS_PARAMETER_ARRAY_TOO_SMALL
Locate the failing graphics boundary: graphics parameter array too small
The useful interpretation of ERROR_GRAPHICS_PARAMETER_ARRAY_TOO_SMALL (0xC02625E6) starts at the gdi monitor boundary: the caller-provided array cannot hold every structure the API needs to return. In practical terms, inspect monitor enumeration output array before changing application-wide graphics settings.
A display adapter can be enumerated without being attached to the current desktop or without owning a physical monitor. Keep those states distinct in UI and logs.
Evidence that makes the result actionable
| Capture item | Why it matters |
|---|---|
| Rejected condition | the caller-provided array cannot hold every structure the API needs to return |
| What to capture | input element count, returned required count, structure size and whether monitor topology changed between calls |
| Current graph state | GDI display-device enumeration, desktop attachment and physical-monitor mapping |
| Supporting trace | EnumDisplayDevices snapshot, DISPLAY_DEVICE flags, session ID, HMONITOR list and physical-monitor count |
| Object identity | monitor enumeration output array |
A controlled comparison
- Capture the failing state. Record input element count, returned required count, structure size and whether monitor topology changed between calls.
- Perform the count query followed by allocation and a second enumeration.
The comparison with ERROR_GRAPHICS_PARTIAL_DATA_POPULATED is especially useful: ERROR_GRAPHICS_PARTIAL_DATA_POPULATED may return usable partial interface-specific data.
Correction and proof
Use the documented two-call pattern and retry once if hot-plug changes the count.
- debug-layer, ETW or driver diagnostics no longer report the rejected monitor enumeration output array contract during the same scenario.
Implementation notes
Log EnumDisplayDevices snapshot, DISPLAY_DEVICE flags, session ID, HMONITOR list and physical-monitor count.
Technical references
- Microsoft: Multiple display monitors — background for the monitor enumeration output array.
- Microsoft: Monitor configuration functions
- Microsoft: EnumDisplayDevices
- Microsoft: Graphics error codes
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