CODEWITHSUNDEEP
visual-c++png
karikari
karikari

Reputation: 6797

Get PNG image file dimension

I would like to get the dimension of a PNG image file inside my local folder on Windows. How can I achieve this using visual c++?

Upvotes: 0

Views: 1393

Answers (2)

kellogs
kellogs

Reputation: 2857

aside from the well-known GDI APIs (I get the feeling you are trying to avoid these) it is worth giving http://msdn.microsoft.com/en-us/library/bb776499%28v=VS.85%29.aspx a shot. Never used it myself though :/

Upvotes: 0

Blindy
Blindy

Reputation: 67380

Should be easy, the png file is formed by an 8 byte intro, followed by a header chunk. Inside the header chunk you have the length (4 bytes), type (4 bytes), followed by the width and height.

So basically, the width is the 4 byte number at 8+8=16 bytes in the file, and the height is at 8+8+4=20 bytes in the file. Just read them!

Upvotes: 2

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