I write my progrem in C#. I Changed resolution in this way:
TwRC rc;
TwCapability tc;
TwFix32 f32 = new TwFix32();
f32.FromFloat(100);//value of DPI
tc = new TwCapability(TwCap.Xresolution, f32);
rc = DScap(appid, srcds, TwDG.Control, TwDAT.Capability, TwMSG.Set, tc);
if (rc != TwRC.Success) {
CloseSrc();
return false;
}
f32.FromFloat(100);
tc = new TwCapability(TwCap.Yresolution, f32);
rc = DScap(appid, srcds, TwDG.Control, TwDAT.Capability, TwMSG.Set, tc);
cc = DScapcc(appid, srcds, TwDG.Control, TwDAT.Capability, TwMSG.Set, tc);
if (rc != TwRC.Success) {
CloseSrc();
return false;
}