| .CALL ABSOLUTE Statement Details. |
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| CALL ABSOLUTE Statement Details |
|
| Syntax |
| CALL ABSOLUTE([argumentlist,]integervariable) |
| |
| Argument Description |
| argumentlist Optional arguments passed to a machine-language |
| procedure. |
| integervariable An integer variable containing a value that is |
| the offset from the beginning of the current |
| code segment, set by DEF SEG, to the starting |
| location of the procedure. The integervariable |
| argument is not passed to the procedure. Your |
| program may need to execute a DEF SEG statement |
| before executing CALL ABSOLUTE to set the code |
| segment for the called routine. |
| |
| Using a noninteger value for integervariable |
| produces unpredictable results. |
| |
| Arguments in argumentlist are passed to the machine-language program |
| as offsets (near pointers) from the current data segment. Although |
| arguments are passed as offsets, the machine-language program is |
| invoked with a far call. |
| |
| Note: The CALL ABSOLUTE statement is provided to maintain |
| compatibility with earlier versions of BASIC. Mixed-language |
| programming using the CALL statement extensions and the new |
| DECLARE statement provide a simpler way to use assembly |
| language with BASIC. |
| |
| Also, in order to use CALL ABSOLUTE you must start QuickBASIC |
| with the correct Quick library, link your program with QB.LIB, |
| or use the QB.QLB Quick library. See the disk-contents list |
| for the locations of these files. |
| |
| Differences from BASICA |
| |
| Assembly-language programs that are invoked from BASICA and that have |
| string arguments must be changed because string descriptors are now |
| four bytes long. The four bytes are the low byte and high byte of the |
| string length followed by the low byte and high byte of the string |
| address. |
| |
