Hi allI'm new at this gauge creating thing and I stumble across a problem while creating my first gauge.The gauge I'm creating is an analogue IASI with s display in the middle showing the mach number and the IAS. The mach number always shows .20 if you are below that mach number. The IAS starts counting from 60. But the strings don't show up ...Would appreciate it if anybody could help me out cause I'm stuck and my C ain't that good yet :(I've also searched on the net for some good documentation about the C language used by the gauges but haven't really found yet, so any advise on those is welcome too :).h file

// DC-8 Project Super 60 gauges// Copyright (c) 2010 DC-8 Project.  All rights reserved.//#define		 VERSION_MAJOR		   1#define		 VERSION_MINOR		   0#define		 VERSION_BUILD		   0// magic to get the preprocessor to do what we want#define		lita(arg) #arg#define		xlita(arg) lita(arg)#define		cat3(w,x,z) w##.##x##.##z##\000#define		xcat3(w,x,z) cat3(w,x,z)#define		VERSION_STRING xlita(xcat3(VERSION_MAJOR,VERSION_MINOR,VERSION_BUILD))#ifndef		VS_VERSION_INFO#define		VS_VERSION_INFO		0x0001#endif///////////////////////////////////////////////////////////////////////////////// AirspeedDigital Bitmaps//#define		BMP_AIRSPEED_DIGITAL_BACKGROUND				0x1000#define		BMP_AIRSPEED_DIGITAL_NEEDLE				0x1100

.rc

// Microsoft Visual C++ generated resource script.//#include "resource.h"#define APSTUDIO_READONLY_SYMBOLS///////////////////////////////////////////////////////////////////////////////// Generated from the TEXTINCLUDE 2 resource.//#include "afxres.h"/////////////////////////////////////////////////////////////////////////////#undef APSTUDIO_READONLY_SYMBOLS/////////////////////////////////////////////////////////////////////////////// Dutch (Belgium) resources#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_NLB)#ifdef _WIN32LANGUAGE LANG_DUTCH, SUBLANG_DUTCH_BELGIAN#pragma code_page(1252)#endif //_WIN32///////////////////////////////////////////////////////////////////////////////// Version//VS_VERSION_INFO VERSIONINFO FILEVERSION 0,1,0,0 PRODUCTVERSION 0,1,0,0 FILEFLAGSMASK 0x3fL#ifdef _DEBUG FILEFLAGS 0x1L#else FILEFLAGS 0x0L#endif FILEOS 0x10004L FILETYPE 0x1L FILESUBTYPE 0x0LBEGIN	BLOCK "StringFileInfo"	BEGIN		BLOCK "040904b0"		BEGIN			VALUE "CompanyName", "DC-8 Project"			VALUE "FileDescription", "FS2004 DC-8 Super 60 Gauge"			VALUE "FileVersion", "0.1.0"			VALUE "LegalCopyright", "Your Copyright."			VALUE "ProductName", "DC-8 Project"			VALUE "ProductVersion", "0.1.0"		END	END	BLOCK "VarFileInfo"	BEGIN		VALUE "Translation", 0x409, 1200	ENDEND///////////////////////////////////////////////////////////////////////////////// Bitmap//BMP_AIRSPEED_DIGITAL_BACKGROUND BITMAP				  "res\\DC8spr60.AirspeedDigital.bg.BMP"BMP_AIRSPEED_DIGITAL_NEEDLE BITMAP				  "res\\DC8spr60.AirspeedDigital.Ndl.BMP"#ifdef APSTUDIO_INVOKED///////////////////////////////////////////////////////////////////////////////// TEXTINCLUDE//1 TEXTINCLUDE BEGIN	"resource.\0"END3 TEXTINCLUDE BEGIN	"\r\0"END#endif	// APSTUDIO_INVOKED#endif	// Dutch (Belgium) resources/////////////////////////////////////////////////////////////////////////////#ifndef APSTUDIO_INVOKED///////////////////////////////////////////////////////////////////////////////// Generated from the TEXTINCLUDE 3 resource.///////////////////////////////////////////////////////////////////////////////#endif	// not APSTUDIO_INVOKED

.c

#include "..\inc\gauges.h"#include "DC8spr60.h"/////////////////////////////////////////////////////////////////////////////// Attitude/////////////////////////////////////////////////////////////////////////////#define		GAUGE_NAME			"Digital_ASI"#define		GAUGEHDR_VAR_NAME	gaugehdr_DigitalAsi#define		GAUGE_W				100#include "DC8spr60.digasi.c"/////////////////////////////////////////////////////////////////////////////// Gauge table entries/////////////////////////////////////////////////////////////////////////////GAUGE_TABLE_BEGIN()	GAUGE_TABLE_ENTRY(&gaugehdr_DigitalAsi)GAUGE_TABLE_END()

ASI c file

// DC8Spr60.AirspeedDigital.c// Copyright (c) 2000 Microsoft Corporation.  All rights reserved.//	Set up gauge headerchar digasi_gauge_name[]		= GAUGE_NAME;extern PELEMENT_HEADER		digasi_list;extern MOUSERECT			digasi_mouse_rect[];GAUGE_HEADER_FS700(GAUGE_W, digasi_gauge_name, &digasi_list,\				   digasi_mouse_rect, 0, 0, 0, 0);#define GAUGE_CHARSET				DEFAULT_CHARSET#define GAUGE_FONT_DEFAULT			"Courier New"#define GAUGE_WEIGHT_DEFAULT		FW_NORMAL/////////////////////////////////////////////////////////////////////////////FAILURE_RECORD	digasi_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};FAILURE_RECORD	ias_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};FAILURE_RECORD	mach_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};#define	GAUGE_MIN_SPEED	60#define	GAUGE_MAX_SPEED	400FLOAT64 FSAPI asi_needle_cb( PELEMENT_NEEDLE pelement ){	FLOAT64	val = pelement->source_var.var_value.n;	if (val > GAUGE_MAX_SPEED)		val = GAUGE_MAX_SPEED;	else if (val < GAUGE_MIN_SPEED)		val = GAUGE_MIN_SPEED;	return val;}FLOAT64 FSAPI mach_string_cb( PELEMENT_STRING pelement ){	FLOAT64	val = pelement->source_var[0].var_value.n;	if (val < 0.20)		val = 0.20;	else		val=val;	//wsprintf(pelement->string, "%3d", (UINT32)val);	return val;}FLOAT64 FSAPI asi_ias_cb( PELEMENT_STRING pelement ){	FLOAT64	val = pelement->source_var[0].var_value.n;	if (val > GAUGE_MAX_SPEED)		val = GAUGE_MAX_SPEED;	else if (val < GAUGE_MIN_SPEED)		val = '---';	//wsprintf(pelement->string, "%3d", (UINT32)val);	return val;}NONLINEARITY  speed_nonlinearity[] ={	{{474,	131},	 0, 0},	{{513,	132},	60, 0},	{{700,	184},	80, 0},	{{843,	318},  100, 0},	{{881,	506},  120, 0},	{{829,  688},  140, 0},	{{698,  828},  160, 0},	{{512,  872},  180, 0},	{{327,  829},  200, 0},	{{193,  691},  250, 0},	{{142,  510},  300, 0},	{{190,  326},  350, 0},	{{326,  187},  400, 0}};MAKE_STRING(	mach_string,	NULL,	mach_fail,	IMAGE_USE_ERASE | IMAGE_USE_TRANSPARENCY,	0,	492, 380,	70, 52,	3,	MACH,	MODULE_VAR_NONE,	MODULE_VAR_NONE,	RGB(213,208,171),	RGB(0,0,0),	RGB(92,92,92),	GAUGE_FONT_DEFAULT,	GAUGE_WEIGHT_DEFAULT,	GAUGE_CHARSET,	0,	DT_CENTER | DT_VCENTER | DT_SINGLELINE,	NULL,	mach_string_cb)MAKE_STRING(	ias_string,	NULL,	ias_fail,	IMAGE_USE_TRANSPARENCY | IMAGE_USE_ERASE,	0,	428, 576,	70, 52,	3,	AIRSPEED,	MODULE_VAR_NONE,	MODULE_VAR_NONE,	RGB(213,208,171),	RGB(0,0,0),	RGB(92,92,92),	GAUGE_FONT_DEFAULT,	GAUGE_WEIGHT_DEFAULT,	GAUGE_CHARSET,	0,	DT_CENTER | DT_VCENTER | DT_SINGLELINE,	NULL,	asi_ias_cb)MAKE_NEEDLE(	asi_needle,	BMP_AIRSPEED_DIGITAL_NEEDLE,	NULL,	digasi_fail,	IMAGE_USE_TRANSPARENCY | IMAGE_USE_ERASE,	0,	510, 506,	33, 38,	AIRSPEED,asi_needle_cb,	speed_nonlinearity,	18	)PELEMENT_HEADER		digasi_needle_list[] ={		&mach_string.header,	&ias_string.header,	&asi_needle.header,	NULL};MAKE_STATIC(	asi_background,	BMP_AIRSPEED_DIGITAL_BACKGROUND,	&digasi_needle_list,	digasi_fail,	IMAGE_USE_TRANSPARENCY,	0,	0,0)PELEMENT_HEADER		digasi_list	= &asi_background.header;/////////////////////////////////////////////////////////////////////////////MOUSE_BEGIN( digasi_mouse_rect,  HELPID_GAUGE_AIRSPEED, 0, 0 )MOUSE_END/////////////////////////////////////////////////////////////////////////////#undef GAUGE_NAME#undef GAUGEHDR_VAR_NAME#undef GAUGE_W

I'm just learning a little bit about "C" so I can use the principles in xml gauges.It looks to me like the ASI c file FLOAT64 FSAPI mach_string_cb( PELEMENT_STRING pelement ) section has 0.20 Mach set as minimum to display:

	FLOAT64	val = pelement->source_var[0].var_value.n;	if (val < 0.20)		val = 0.20;	else		val=val;	//wsprintf(pelement->string, "%3d", (UINT32)val);

I'm interpreting that as: "if Mach is less than 0.20, Display 0.20, otherwise display Mach"...Don

I'm just learning a little bit about "C" so I can use the principles in xml gauges.It looks to me like the ASI c file FLOAT64 FSAPI mach_string_cb( PELEMENT_STRING pelement ) section has 0.20 Mach set as minimum to display:I'm interpreting that as: "if Mach is less than 0.20, Display 0.20, otherwise display Mach"...Don

yep that's correct. if Mach number is lower then .20 it should display .20, otherwise it should display the current mach number. But it doesn't show anything ... :s

First... you commented out where it actually creates the strings for display://wsprintf(pelement->string, "%3d", (UINT32)val);Second... those are formating integer values, which won't work for float values.

Don't use 'stacked' PELEMENT headers

PELEMENT_HEADER		digasi_needle_list[] ={		&mach_string.header,	&ias_string.header,	&asi_needle.header,	NULL};

- I can guarantee you're storing up trouble for yourself as you get better at this game. For further info on this - and gauge design in general - search sd2gau29.zip in the Avsim or Flightsim libraries.Also, your problem is here;-

 //wsprintf(pelement->string, "%3d", (UINT32)val);

You do need that print command but it should say

 sprintf(pelement->string, "%0.3f", val);

MACH is returned as a float and is always less than one (unless you are supersonic). Better still - but it depends on your version of Visual Studio - you should consider using the security verisons of commands such as s_sprintf instead of sprintf. -Dai

Great, thx for the help so farnew code looks like this, but now my needle doesn't show up any more :( And the mach number the string is showing is way off ... While I should be at .50 the string shows me 801 for instance ...

// DC8Spr60.AirspeedDigital.c// Copyright (c) 2000 Microsoft Corporation.  All rights reserved.//	Set up gauge headerchar digasi_gauge_name[]		= GAUGE_NAME;extern PELEMENT_HEADER		digasi_list;extern MOUSERECT			digasi_mouse_rect[];GAUGE_HEADER_FS700(GAUGE_W, digasi_gauge_name, &digasi_list,\				   digasi_mouse_rect, 0, 0, 0, 0);#define GAUGE_CHARSET				DEFAULT_CHARSET#define GAUGE_FONT_DEFAULT			"Courier New"#define GAUGE_WEIGHT_DEFAULT		FW_NORMAL/////////////////////////////////////////////////////////////////////////////FAILURE_RECORD	digasi_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};FAILURE_RECORD	ias_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};FAILURE_RECORD	mach_fail[] ={	{FAIL_GAUGE_AIRSPEED, FAIL_ACTION_ZERO},	{FAIL_SYSTEM_ELECTRICAL_PANELS, FAIL_ACTION_ZERO},	{FAIL_NONE, FAIL_ACTION_NONE}};#define	GAUGE_MIN_SPEED	0#define	GAUGE_MAX_SPEED	400FLOAT64 FSAPI asi_needle_cb( PELEMENT_NEEDLE pelement ){	FLOAT64	val = pelement->source_var.var_value.n;	if (val > GAUGE_MAX_SPEED)		val = GAUGE_MAX_SPEED;	else if (val < 60)		val = GAUGE_MIN_SPEED;	return val;}FLOAT64 FSAPI mach_string_cb( PELEMENT_STRING pelement ){	FLOAT64	val = pelement->source_var[0].var_value.n;	if (val < 0.20)		val = 0.20;	else		val=val;	sprintf(pelement->string, "%0.3f", val);	return val;}FLOAT64 FSAPI asi_ias_cb( PELEMENT_STRING pelement ){	FLOAT64	val = pelement->source_var[0].var_value.n;	if (val > GAUGE_MAX_SPEED)		val = GAUGE_MAX_SPEED;	else if (val < GAUGE_MIN_SPEED)		val = '---';	sprintf(pelement->string, "%3d", (UINT32)val);	return val;}NONLINEARITY  speed_nonlinearity[] ={	{{474,	131},	 0, 0},	{{513,	132},	60, 0},	{{700,	184},	80, 0},	{{843,	318},  100, 0},	{{881,	506},  120, 0},	{{829,  688},  140, 0},	{{698,  828},  160, 0},	{{512,  872},  180, 0},	{{327,  829},  200, 0},	{{193,  691},  250, 0},	{{142,  510},  300, 0},	{{190,  326},  350, 0},	{{326,  187},  400, 0}};MAKE_NEEDLE(	asi_needle,	BMP_AIRSPEED_DIGITAL_NEEDLE,	NULL,	digasi_fail,	IMAGE_USE_TRANSPARENCY | IMAGE_USE_ERASE,	0,	510, 506,	33, 38,	AIRSPEED,asi_needle_cb,	speed_nonlinearity,	18	)PELEMENT_HEADER asi_needle_list[] ={&asi_needle.header,NULL};MAKE_STRING(	mach_string,	NULL,	mach_fail,	IMAGE_USE_ERASE | IMAGE_USE_TRANSPARENCY,	0,	492, 380,	140, 80,	3,	MACH,	MODULE_VAR_NONE,	MODULE_VAR_NONE,	RGB(213,208,171),	RGB(0,0,0),	RGB(92,92,92),	GAUGE_FONT_DEFAULT,	GAUGE_WEIGHT_DEFAULT,	GAUGE_CHARSET,	0,	DT_CENTER | DT_VCENTER | DT_SINGLELINE,	NULL,	mach_string_cb)PELEMENT_HEADER mach_string_list[] ={&mach_string.header,NULL};/*MAKE_STRING(	ias_string,	NULL,	ias_fail,	IMAGE_USE_TRANSPARENCY | IMAGE_USE_ERASE,	0,	428, 576,	180, 70,	3,	AIRSPEED,	MODULE_VAR_NONE,	MODULE_VAR_NONE,	RGB(213,208,171),	RGB(0,0,0),	RGB(92,92,92),	GAUGE_FONT_DEFAULT,	GAUGE_WEIGHT_DEFAULT,	GAUGE_CHARSET,	0,	DT_CENTER | DT_VCENTER | DT_SINGLELINE,	NULL,	asi_ias_cb)PELEMENT_HEADER ias_string_list[] ={&ias_string.header,NULL};*/MAKE_STATIC(	asi_background,	BMP_AIRSPEED_DIGITAL_BACKGROUND,	mach_string_list,	digasi_fail,	IMAGE_USE_TRANSPARENCY,	0,	0,0)PELEMENT_HEADER		digasi_list	= &asi_background.header;/////////////////////////////////////////////////////////////////////////////MOUSE_BEGIN( digasi_mouse_rect,  HELPID_GAUGE_AIRSPEED, 0, 0 )MOUSE_END/////////////////////////////////////////////////////////////////////////////#undef GAUGE_NAME#undef GAUGEHDR_VAR_NAME#undef GAUGE_W

you might notice that I commented the IAS string because I'm still trying to find out how to make this:

sprintf(pelement->string, "%0.3f", val);

work for IASand s_sprintf doesn't work, undeclared identifier ...EDIT: got the needle back to work

Do you know how to program in C/C++ to begin with?

Do you know how to program in C/C++ to begin with?

very basic Cthat's why I placed this in the first post:

Would appreciate it if anybody could help me out cause I'm stuck and my C ain't that good yet ohmy.gifI've also searched on the net for some good documentation about the C language used by the gauges but haven't really found yet, so any advise on those is welcome too

Seriously - download sd2gau29.zip. It will answer a lot of your questions, plus a few you didn't even think of yet.-Dai[Edit] s_sprintf is not included in your version of Visual Studio. I guess you are using VS2003.

sprintf is used to format strings. Use of the help file, or a search of the internet would be a great deal of help for you in understanding how to use it: http://www.cplusplus.com/reference/clibrary/cstdio/sprintf/

already got that creating C-gauges file open and using it since the beginning.using VS2008 Pro (got it from school)

As I already stated as FS-Developer, the MACH variable in FS doesn't actually return a "mach value" at all...

MACH,	//  mach, 64k=3.2 mach (would be better as UIF32)

That's why there's a macro to convert the FS return to "mach":

#define		FS_MACH(val)			(val*3.2/65536.0)

Alternatively, you could simply use this FS variable instead:

BARBER_POLE_MACH,	// real mach

BARBER_POLE_MACH is Mmo... not current mach.

Mach speed

FLOAT64 tempval = 0.0;lookup_var (&mach);	//module var MACHtempval = mach.var_value.n;machind = (UINT32)(tempval / 20.480);sprintf(pelement->string, "%03d", machind);

Airspeed

lookup_var (&ias);	//module var AIRSPEEDsprintf(pelement->string, "%03d", (int)ias.var_value.n);

-Dai