Eureka!
1) Create a new cmsCIEXYZ structure this way:
CIE_XYZ MyXYZ;
2) Populate its members with test values:
MyXYZ.CIE_X = 0.9666;
MyXYZ.CIE_Y = 1.0;
MyXYZ.CIE_Z = 0.8555;
3) Create boolean variable for cmsWriteTag return code:
bool Result;
4) Allocate unmanaged memory for MyXYZ:
IntPtr Pointer = Marshal.AllocHGlobal(Marshal.SizeOf(MyXYZ));
5) Ask CLR to "move" the data from managed memory to unmanaged memory:
Marshal.StructureToPtr(MyXYZ, Pointer, true);
6) I execute the call to cmsWriteTag:
Result = cmsWriteTag(hProfiler, 0x77747074, Pointer);
7) The call succeeded! I got "Result = true"!
8) To test the change in XYZ values, I make a new call to cmsReadTag:
IntPtr Pointer = IntPtr.Zero;
Pointer = NativeMethods.cmsReadTag(hProfile, 0x77747074);
MyXYZ MediaWhitePoint = (MyCIEXYZ)Marshal.PtrToStructure(Pointer,
typeof(MyCIEXYZ));
9) And voilà! These are the new XYZ values!!!!
// X = 0.9666
// Y = 1.0
// Z = 0.8555
10) I love programming with LittleCMS -- thank YOU Marti Maria!!!!
I still have a TON of questions...
Once I modified the monitor profile, is there a way to "Save As"? Save the
profile under a new name?
/ Roger Breton
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