How to statically init DEVMODE structure?

[taj]

Help!

I am sadly failing in VC++ Express to statically initialise with values filled in the following structure:

http://msdn2.microsoft.com/en-us/library/ms535771.aspx

I want to do something like:

static DEVMODE dmScreenSettings={
(BCHAR)NULL, //device name
(WORD)0, //spec version
(WORD)0, // driver version
(WORD)sizeof(dmScreenSettings),
...
..

but I cant get it to work. Can anyone provide a quick example?
A web search didnt reveal much.

I should add, under XP/Vista!

Chris

[ahayweh]

What errors are you getting? Using the method  you are using, you *have* to intialize all members of the DEVMODE struct. If you only want to  init certain members, just use the member access operator.

Here is a rip from an old engine of mine :

pOGL is a pointer to a OpenGL interface struct.

DEVMODE dmScreenSettings;

memset(&dmScreenSettings , 0 , sizeof(dmScreenSettings));

dmScreenSettings.dmSize=sizeof(dmScreenSettings);   
dmScreenSettings.dmPelsWidth   = pOGL->contextPitch;         
dmScreenSettings.dmPelsHeight   = pOGL->yResolution;         
dmScreenSettings.dmBitsPerPel   = pOGL->contextDepth;            
dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;

[taj]

ahayweh,

I want to do it statically and assign all relevant members, *not* at run time. My errors are:

.\Main.cpp(95) : warning C4305: 'initializing' : truncation from 'DWORD' to 'BYTE'
.\Main.cpp(95) : warning C4309: 'initializing' : truncation of constant value
.\Main.cpp(104) : warning C4309: 'initializing' : truncation of constant value
.\Main.cpp(105) : warning C4309: 'initializing' : truncation of constant value

Chris

[stormbringer]

looks more like warnings because of type casting rather than errors...

[taj]

looks more like warnings because of type casting rather than errors...

Yes I know, but I have cast to the correct types. No something else is wrong in what I'm doing.

Aha! It doesnt work yet but I got rid of the errors:

static DEVMODE dmScreenSettings={
(BCHAR)NULL, //device name

Should be

static DEVMODE dmScreenSettings={
(BCHAR)"", //device name

Chris

[Jim]

Man!  Device name is an array!!
So it needs a CCHDEVICENAME-long initializer.  Something of type char[CCHDEVICENAME].  Null won't work.  (BCHAR)"" is hopeful
Take out ALL the casts, and then fix them on a case-by-case basis.  With the casts in there you're lieing to yourself and the compiler.

Jim

[taj]

Aha, cracked it!

static DEVMODE dmScreenSettings={
"",0,0,
(WORD)sizeof(dmScreenSettings),
0,
DM_PELSWIDTH|DM_PELSHEIGHT,
0,0,0,0,0,0,0,0,0,0,0,0,0,
"",
0,0,
1024,
768,
0,0,0,0,0,0,0,0,0,0};

...it was those "" quotes that were killing me. OK incase you are wondering, this is all about crunching a few more bytes from 1k frameworks. Thanks to those who tried to help.

Chris