DavidCrow wrote:

Do you not think it pertinent to include the line number of the code this error refers to? We're not mind readers.

Oh sorry, pointed lines are : real_T d; and ** real_T is the representation of double in this format, even if i write there 'double' appears again as error ** num.d = *uPtrs[0]; Thank you for your consideration! Cahit

Hi all, i am working on a simulink model (graphical block programming) and in a block i am supposed to write a user defined function (S-Function) which takes a double value and outputs 8 uint8 values. It has some simulink related commands but basically C Code. Since i have an error message, i would like to share it with you all to find a way out. #define S_FUNCTION_NAME double2integer #define S_FUNCTION_LEVEL 2 #include "simstruc.h" typedef union { uint8_T uvalue[8]; real_T d; //real_T is double } UnionNum; static void mdlInitializeSizes(SimStruct *S) { ssSetNumSFcnParams(S, 0); if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) { return; /* Parameter mismatch will be reported by Simulink */ } if (!ssSetNumInputPorts(S, 1)) return; ssSetInputPortWidth(S, 0, 1); ssSetInputPortDataType(S, 0, SS_DOUBLE); ssSetInputPortDirectFeedThrough(S, 0, 1); if (!ssSetNumOutputPorts(S,1)) return; ssSetOutputPortWidth(S, 0, 8); ssSetOutputPortDataType(S, 0, SS_UINT8); ssSetNumSampleTimes(S, 1); ssSetOptions(S,0); } static void mdlOutputs(SimStruct *S, int_T tid) { int_T i; int_T width = ssGetOutputPortWidth(S,0); InputPtrsType uPtrs = ssGetInputPortSignalPtrs(S,0); uint8_T *y = (uint8_T *)ssGetOutputPortSignal(S,0); UnionNum num; num.d = *uPtrs[0] ; for(i=0; i

Hello, I am trying to send serial port a double value as 8 sets of uint8 by means of union and receiving in the same manner. For that, im calling read and write functions from an external '.cpp'file through class-object implementation as you see in my code.I use that implementation seperately in transmit and receive functions. int transmit (double x) { union ifas { double d; unsigned char u8value[8]; //uint8 }; union ifas member; CSyncSerialComm *ObjectCSyncSerialComm; //Object in class from ext.file ObjectCSyncSerialComm = new CSyncSerialComm("0x3F8"); member.d = x; printf("\nmember.d=%f\n",member.d); ObjectCSyncSerialComm.WriteFile(m_hSerialComm, member.u8value, 8, &dwNumberOfBytesWritten, NULL); delete ObjectCSyncSerialComm ; return (int) member.u8value; } double receive(unsigned char) { union aachen { double c; unsigned char u8value[8]; }; union aachen team; CSyncSerialComm *ObjectCSyncSerialComm; ObjectCSyncSerialComm = new CSyncSerialComm("0x3F8"); ObjectCSyncSerialComm.ReadFile(m_hSerialComm, &szBuf, 10, &dwIncommingReadSize, NULL); delete ObjectCSyncSerialComm ; return (double)team.c ; } int main(int argc, char* argv[]) { double var; unsigned char z; scanf("%lf",&var); transmit(var); receive(z); return 0; } What i want to ask you is, in writing and reading commands i'm receiving syntax errors. If I type both in reading and writing (bold lines), ObjectCSyncSerialComm.ReadFile(m_hSerialComm, &szBuf, 10, &dwIncommingReadSize, NULL); Error==> On the left side of the structure . or .* is required If I type as follows, ObjectCSyncSerialComm.*ReadFile(m_hSerialComm, &szBuf, 10, &dwIncommingReadSize, NULL); Error==> Invalid pointer used. By the way, im using C++ Builder 6.0 Compiler. What could be the problem? Any other problem can cause this? I could not find any solution. Any comment and/or suggestion will be appreciated.Thank you. Regards, Cahit -- modified at 12:01 Friday 18th August, 2006

Hello, I received an error message when i tried to send serial port the datas with outportb. %Starting with dos.h library ... int port=0x378; outportb(int port, unsigned int); ... ... for ( i=0 ; i<8 ; i++) { outportb(port,member.u8value[i]); } ... Error Message ==> [Linker Error] Unresolved external '_outportb' referenced from H:\INTERFACE\INTERFACE.OBJ (Interface is the file in which all datas are saved) What could be the problem? Thanks for your tricks in advance. Regards, Cahit

Hello everyone, Thank you for your suggestions in my previous message.It's working.As next step, i want to send my uint8 values here to serial port.For that i added two lines into my code (bold) but i receive this error, [Linker Error] Unresolved external '_outportb' referenced from H:\INTERFACE\INTERFACE.OBJ (Interface is the name of my file in which i saved my code and files) I didnt get the cause of problem,what's wrong?. If anyone has an idea, would be pleased! #include #include #include #include // system() int transmit (double x); int i; system(); outportb(int port, unsigned int); int transmit (double x) { union ifas { double d; unsigned char u8value[8]; }; union ifas member; member.d = x; printf("\nmember.d=%d\n",member.d); for ( i=0 ; i<8 ; i++) { printf("\nmember.u8value[%d]=%f\n",i,member.u8value[i]); outportb(port,member.u8value[i]); } return 0; } int main(int argc, char* argv[]) //Console { double var; scanf("%lf",&var); transmit(var); system("pause"); return 0; } Regards, Cahit -- modified at 11:37 Thursday 17th August, 2006

Hi all, I am currently working on Serial Interface between a control box and PC and want to send/receive double values from Pc to the box as 8 uint8 values since the box only accepts in uint8 form. For that i thought as follows : to get that double value (64 bits) in binary form and get the last 8 bits with &(and) operator and shifting bits to right till all bits are finished,namely : double var; char var2send[8]; % in array var2send[0]= var & 0x00000000000000ff % last 8 bits with & operator var>>8; %shifting bits var2send[1]= var & 0x00000000000000ff var>>8; . . % and sending this array as output . But in this code, i received an error that says i cant use double with & operators so that must be converted 64 bit long form.Besides, cast function rounds my double value to the nearest integer even if i type number like 23.34353 with precision. How can i manage to do this?? or anyone has better way or suggestion? I hope i could clearly explain my problem. I would be very pleased if you could help me! Thanks a lot! Cahit

oh sorry, i deliver my message in visual c++ forum then!

Hi all, I am currently working on Serial Interface between a control box and PC and want to send/receive double values from Pc to the box as 8 uint8 values since the box only accepts in uint8 form. For that i thought as follows : to get that double value (64 bits) in binary form and get the last 8 bits with &(and) operator and shifting bits to right till all bits are finished,namely : double var; char var2send[8]; % in array var2send[0]= var & 0x00000000000000ff % last 8 bits with & operator var>>8; %shifting bits var2send[1]= var & 0x00000000000000ff var>>8; . . % and sending this array as output . But in this code, i received an error that says i cant use double with & operators so that must be converted 64 bit long form!! How can i manage to do this?? or anyone has better way or suggestion? I hope i could clearly explain my problem. I would be very pleased if you could help me! Thanks a lot! Cahit