Import DLL: control to the @dummy @.

Hello!

I'm automatically import a DLL with Labview.

A function has an argument with the following data type:

typedef struct CHILLER_CONTROLLER_state_tag
{
    SYSTEMTIME      TimeStamp;
    unsigned char   ChillerState;
    double          ChillerWaterSetPoint;
    double          ChillerWaterTemperature;
    double          ChillerExhaustTemperature;
    double          ChillerFlow;
    double          ChillerPressure;
} CHILLER_CONTROLLER_state;

LabVIEW is reflected in the structure of the following cluster:

Dummy controls come

LabVIEW on Windows 32-bit platforms "packs of byte" given in clusters. This means that it aligns data on byte boundaries. Visual C and many other C compilers align the data in a structure (a synonym of a cluster of LabVIEW) to configurable data size. The alignment of data by default is 8 bytes, and data in a structure elements are aligned on the smallest alignment by default or its own size of the element.

This means that your double is aligned to a multiple of 8 bytes for a double has a size of 8 bytes.

However! A library developer is free to add explicit #pragma pack() instructions in the header file to cause a different default alignment (which they would then honor the import library Wizard) or... sigh... specify a different alignment in default project settings for its library (the library import wizard is not possible to know).

Fortunately, most C programmers don't know even how to change alignment of project default settings, so if there is no #pragma pack() set out in statements of header this is a pretty safe, though not a very safe assumption, use 8-bit default alignment.

Tags: NI Software

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