Why does EnumPrinters come up as undefined?

[mkdutchman]

Is there some other call that I've missed that does the same thing?

[ToutEnMasm]

Perhaps have you no printers connected or with power on.
Perhaps give you bad parameters to the function.
can you post the call to the function ?

[MichaelW]

This is just a guess, but your source must include winspool.inc and winspool.lib.

[mkdutchman]

This is what I have now, when I try to assemble it the assembler states that EnumPrinters is undefined. Will check on the winspool files.........

Code Select Expand


    .486                                ; create 32 bit code
    .model flat, stdcall                ; 32 bit memory model
    option casemap :none                ; case sensitive
 
    include \masm32\include\windows.inc
    include \masm32\include\masm32.inc
    include \masm32\include\gdi32.inc
    include \masm32\include\user32.inc
    include \masm32\include\kernel32.inc
    include \masm32\include\Comctl32.inc
    include \masm32\include\comdlg32.inc
    include \masm32\include\shell32.inc
    include \masm32\include\oleaut32.inc
    include \masm32\include\msvcrt.inc

    includelib \masm32\lib\masm32.lib
    includelib \masm32\lib\gdi32.lib
    includelib \masm32\lib\user32.lib
    includelib \masm32\lib\kernel32.lib
    includelib \masm32\lib\Comctl32.lib
    includelib \masm32\lib\comdlg32.lib
    includelib \masm32\lib\shell32.lib
    includelib \masm32\lib\oleaut32.lib
    includelib \masm32\lib\msvcrt.lib

    .data?
        EnumStructure   db  1024 DUP (?)
        Bytescopied     dd  ?
        numPrinters     dd  ?
    .data
        Flags   dd  PRINTER_ENUM_LOCAL
        pName   dd  NULL
        Level   dd  2
        pEnum   dd  OFFSET EnumStructure
        cbBuf   dd  1024
        Needed  dd  OFFSET Bytescopied
        Retrned dd  OFFSET numPrinters

        Capt    db  "Debug Messagebox",NULL
        mFalse  db  "Didn't work",NULL
        mTrue   db  "Worked",NULL
    .code

start:
 
; «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««
invoke EnumPrinters,Flags,pName,Level,pEnum,cbBuf,Needed,Retrned

    cmp al,TRUE
    jz worked
invoke MessageBox,0,addr mFalse,addr Capt,MB_OK
invoke ExitProcess,NULL

worked:
invoke MessageBox,0,addr mTrue,addr Capt,MB_OK
invoke ExitProcess,NULL
; «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««

end start


[mkdutchman]

This is just a guess, but your source must include winspool.inc and winspool.lib.

That's what is was, sure enough

[MichaelW]

On most systems EnumPrinters will enumerate more than one printer, even if the system has only one physical printer attached. For example, on my system it enumerates two:

HP DeskJet 1000C,HP DeskJet 1000C
Fax,Windows NT Fax Driver

Since you have no reasonably way to know how many printers will be enumerated, or how big the returned data for each printer will be, Microsoft provided a method of determining the size of the required buffer. To do this you first call the function with the cbBuf parameter set to zero, then use the value returned in cbNeeded to size the buffer. On return from a successful second call the buffer will include, for each printer, the PRINTER_INFO_x structure (all of which are defined in the MASM32 windows.inc), and then following the last structure any associated strings (and possibly other data).