Windows C++ : DocumentProperties() doesn't modify the print settings of StartDocPrinter()

Question

Hello,

I would like to print on two-sided (duplex),

the complete code is here, can you reproduce it ?

but my HP printer prints one sided.

I allocated the correct size of buffer.

like refer to the Doc:Modify printer settings with the DocumentProperties() Function

Thanks

Answer 1

You don't use the returned DEVMODE

As MSDN says :" The resulting DEVMODE that is returned to the caller is suitable for other API calls that use DEVMODE buffers such a CreateDC(), SetPrinter(), PrintDlg(), or ResetDC().

Answer 2

DocumentProperties(NULL
    hPrinter,
    pDevice,
    pDevMode, /* Reuse our buffer for output. */ 
    pDevMode, /* Pass the driver our changes. */ 
    DM_IN_BUFFER | /* Commands to Merge our changes and */ 
    DM_OUT_BUFFER); /* write the result. */

Le DEVMODE is passed to DocumentProperties() which is stored in the spool file.

but it's ignored by « Hp Smart Universal Printing » driver...