Experimental Physics and
Industrial Control System

On Tue, 2005-10-11 at 16:25 +0200, Jens Eden wrote:

Mark,

it is possible to link applications compiled with MinGW to
dll-Files compiled with MS Visual Studio.
So in theory it is possible to link your MinGW/QT-Application to Epics
base compiled with MS Visual C++.

No it is not.  We have already gone down this path.  We are dealing with
C++ code and the compiler that you use for building EPICS BASE must be
the same when working with Qt.

We built EPICS BASE with MS C++ and tried to link EPICS libraries with
the GPLd version of Qt which uses MinGW only; did not work.

That's all I tried, so I don't know, if there are other issues with the
two compilers if developing real world applications.

*****************
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif
__stdcall int ca_context_create(int);
__stdcall int ca_create_channel(char *, void *, void *, int, void *);
__stdcall int ca_array_get( long, long, void *, void *);
__stdcall int ca_pend_io( double);
__stdcall int ca_flush_io();
#ifdef __cplusplus
}
#endif

int main(void)
{
    int result;
    char *pvname="ringCurrent1";
    char somespace[500];
    void *mychid;
    double doubledata=1.234;

    result = ca_context_create(0);
    if (result != 1) {
        printf("CA error (%d) ca_context_create \n", result);
	return 1;
    }
    result = ca_create_channel(pvname, NULL, NULL, 0, mychid);
    if (result != 1) {
        printf("CA error (%d) ca_create_channel \n", result);
	return 1;
    }
    result = ca_flush_io();
    if (result != 1) {
        printf("CA error (%d) ca_pend_io \n", result);
	return 1;
    }
    result = ca_pend_io(1.0);
    if (result != 1) {
        printf("CA error (%d) ca_pend_io \n", result);
	return 1;
    }
    result = ca_array_get(DBR_DOUBLE, 0, mychid, &doubledata);
    if (result != 1) {
        printf("CA error (%d) ca_array_get \n", result);
	//	return 1;
    }
     result = ca_pend_io(1.0);
    if (result != 1) {
        printf("CA error (%d) ca_pend_io \n", result);
	return 1;
    }

    printf("value: %9.5g\n", doubledata);
}

Replies:

Re: Qt-compatible Channel Access lib Mark Davis

References:

Qt-compatible Channel Access lib Mark Davis

Re: Qt-compatible Channel Access lib Jens Eden

Re: Qt-compatible Channel Access lib Ernest L. Williams Jr.

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