en:ibm:prcp:vio:getbuf

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en:ibm:prcp:vio:getbuf [2016/02/04 09:34] – created valeriusen:ibm:prcp:vio:getbuf [2016/09/14 10:59] (current) – valerius
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 ==== VioGetBuf ==== ==== VioGetBuf ====
 +
 +**Bindings**: [[getbuf#C bindings|C]], [[getbuf#MASM bindings|MASM]]
  
 This call returns the address of the logical video buffer (LVB).  This call returns the address of the logical video buffer (LVB). 
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 [[en:ibm:prcp:vio:getmode|VioGetMode]] may be used to determine the dimensions of the buffer.  [[en:ibm:prcp:vio:getmode|VioGetMode]] may be used to determine the dimensions of the buffer. 
  
-If [[en:ibm:prcp:vio:setmode|VioSetMode is issued following a [[en:ibm:prcp:vio:getbuf|VioGetBuf]] call, the size of the logical video buffer is adjusted to correspond to the new mode. There is one logical video buffer per session (or presentation space if AVIO application) that corresponds to the current mode on the current display configuration. +If [[en:ibm:prcp:vio:setmode|VioSetMode]] is issued following a [[en:ibm:prcp:vio:getbuf|VioGetBuf]] call, the size of the logical video buffer is adjusted to correspond to the new mode. There is one logical video buffer per session (or presentation space if AVIO application) that corresponds to the current mode on the current display configuration. 
  
  
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 This function returns the address and length of the Advanced VIO presentation space. The presentation space may be used to directly manipulate displayed information.  This function returns the address and length of the Advanced VIO presentation space. The presentation space may be used to directly manipulate displayed information. 
 +
 +=== C bindings ===
 +
 +<code c>
 +#define INCL_VIO
 +
 +USHORT  rc = VioGetBuf(LVBPtr, Length, VioHandle);
 +
 +PULONG           LVBPtr;        /* Points to LVB */
 +PUSHORT          Length;        /* Length of buffer */
 +HVIO             VioHandle;     /* Vio handle */
 +
 +USHORT           rc;            /* return code */
 +
 +</code>
 +
 +=== MASM bindings ===
 +
 +<code masm>
 +EXTRN  VioGetBuf:FAR
 +INCL_VIO            EQU 1
 +
 +PUSH@  DWORD   LVBPtr        ;Points to LVB
 +PUSH@  WORD    Length        ;Length of buffer
 +PUSH   WORD    VioHandle     ;Vio handle
 +CALL   VioGetBuf
 +
 +Returns WORD
 +
 +</code>