The DLL file has no error retrieving function. The called function returns with the error code (int).
Error Code number
Error Code
Meaning
0
PNGERR_NOERROR
No error
1
PNGERR_CREATE
Unable to create file.
2
PNGERR_OPEN
File not found.
3
PNGERR_MEMORY
Not enough memory.
4
PNGERR_HANDLE
Invalid bitmap or DIB handle.
5
PNGERR_READING
Error occured while loading.
6
PNGERR_WRITING
Error occured while saving.
7
PNGERR_CREATEDIBITMAP
Unable to create DIB.
8
PNGERR_GETDIBITS
Unable to get DIB.
9
PNGERR_PALETTE
Palette missing.
10
PNGERR_BITDEPTHORALPHA
Unsupported bit depth or alpha channel exist.