Pixel Plotting with a Pointer - Problem [RESOLVED]

[ISDP]

Hi,

After reading this thread: http://www.vbforums.com/showthread.p...hreadid=209455 I found a link to the following site, which describes how to use a pointer as the fastest way to plot single pixels: http://rookscape.com/vbgaming/tutAY.php , but I'm having some problems with it.

At the beginning it declares the variable 'sa' as a 'SAFEARRAY2D' to store the image's data in, but when the data has been assigned and the CopyMemory function is used, with the variable 'sa' as the source of the data, I get the following warning:

Compile Error:

Type mismatch: array or user-defined type expected

If anyone could take a look at the code in the link and see why it might be doing this I would be very greatful,

Thanks,

ISDP

[cyborg]

i've had the same problem with that code...

[Machaira]

I think he forgot some steps. Try the example here instead - http://www.allapi.net/apilist/GetObject.shtml

[Electroman]

You need to declare two versions of the API:

Private Declare Function VarPtrArray Lib "msvbvm50.dll" Alias "VarPtr" (Ptr() As Any) As Long
Private Declare Function VarPtr Lib "msvbvm50.dll" (Ptr As Any) As Long

He only put one of the in, its the same API except one takes a Array and the other doesn't. Use:

CopyMemory ByVal VarPtrArray(pic), VarPtr(sa), 4

[ISDP]

Ok, thanks for all the help, it's been very useful! I'll get back to you all if I have any more problems,

ISDP