Magtek MAGTEK User Manual download pdf (Page 71)

Section 5. Application Programmable Interface

McpCall

This function is used to execute an MCP command request. Commands can be issued to the

MCP device or MCP device application embedded within the MCP device.

DWORD McpCall( HANDLE hDevice, PMCPBUS pMCPBUS );

Parameters

hDevice

Handle to the specified device (communications resource) that is to execute the command. This

handle was returned from the McpOpen function.

pMCPBUS

Pointer to the MCPBUS structure used by the MCP API function to perform this operation.

The following structure members are used as input parameters.

Member Meaning

dwApplicationID Device Application ID.

dwCommandID Command Code. Specific command to be executed by the application.

lpInBuffer Pointer to storage buffer containing addition data associated with the

command.

dwInBufferLen Length (in bytes) of data contained in the Input Buffer pointed to by

lpInBuffer

lpOutBuffer Pointer to storage buffer to receive the response from the application

dwOutBufferSize Size (in bytes) of output storage buffer pointed to by lpOutBuffer

The following members are used as output parameters.

Member Meaning

dwResultCode Result Code. Refer to the device's Command Reference for possible

values.

lpOutBuffer Pointer to storage buffer containing the response from the application

dwResponseLen Length (in bytes) of the response returned in the buffer pointed to by

lpOutBuffer

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Magtek MAGTEK User Manual Page 71