Function DllExecuteCall() Foundation
Calls a function from a dynamically loaded DLL using a call-template.
DllExecuteCall( <cCallTemplate> [, <xParam,...>] ) --> xReturn
DllExecuteCall() returns the return value of the executed DLL function. If the DLL complies with the Xbase++ calling convention, the value may be of any Xbase++ data type. Otherwise, the return value is of numeric data type.
In case of a runtime error, the return value can be substituted by the error handler.
The function DllExecuteCall() is used in conjunction with DllPrepareCall() which prepares a call-template for the execution of a DLL function. The call-template is passed to DllExecuteCall() together with the parameters for the DLL function. The call-template can be reused any number of times. However, call-templates can only be used by the process in which they were created.
Notes for Xbase++ DLLs
If a DLL file is created by Xbase++, the fastest possible way to call a function contained in a dynamically loaded Xbase++ DLL is provided by the macro-operator. The following expression is used for that purpose:
The macro-operator searches for the function name in the symbol table, the execution-operator () calls this function and passes the optional parameters <xParam> to it. If a DLL does not comply with the Xbase++ calling convention, this is not possible.
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