Programming Forums > Application Development > C++

freddielj · Mar 29th, 2005, 7:55 AM

i wanna store pointers of type file in an Array but declaration of an array of type file gives me the error
error C2275: 'FILE' : illegal use of this type as an expression

any ideas how i should store them?
Thanks
Freddie

Berto · Mar 29th, 2005, 8:11 AM

anychance of seeing the code ?

freddielj · Mar 29th, 2005, 8:17 AM

FILE *BernardoBellotto;
FILE *JacopoLigozzi;
FILE *LudoviceCarracci;
FILE *Monalisa;
BernardoBellotto = fopen("BernardoBellotto.txt", "r");

JacopoLigozzi = fopen("JacopoLigozzi.txt", "r");

LudoviceCarracci = fopen("LudoviceCarracci.txt", "r");

Monalisa = fopen("Monalisa.txt", "r");

FILE displayarray[numberofdisplays];

displayarray[0] = BernardoBellotto;
displayarray[1] = JacopoLigozzi;
displayarray[2] = LudoviceCarracci;
displayarray[3] = Monalisa;

Berto · Mar 29th, 2005, 9:03 AM

where does this number of displays come from?

spydoor · Mar 29th, 2005, 9:14 AM

you declared each FILE as a pointer, so your array should be of type FILE *

(Toggle Plain Text)

FILE *displayarray[numberofdisplays];

tempest · Mar 29th, 2005, 9:38 AM

Exactly, and numberofdisplays has to be a true constant.

displayarray[0] = **BernardoBellotto;
displayarray[1] = **JacopoLigozzi;
displayarray[2] = **LudoviceCarracci;
displayarray[3] = **Monalisa;

It has to point to the memory address, it can't try and store it again.

freddielj · Mar 29th, 2005, 10:05 AM

numberofdiplays is defined as a global, an d cool hopefully its works for me thanks for the help thou
Fred

freddielj · Mar 29th, 2005, 10:41 AM

FILE *displayarray[numberofdisplays];
gives me
error C2275: 'FILE' : illegal use of this type as an expression

numberofdisplays is global.

spydoor · Mar 29th, 2005, 11:16 AM

is it possibly somewhere else in your code.
This simple example worked for me on 2 different compilers

(Toggle Plain Text)

#include <stdio.h>

int main()
{

    FILE *ME;
    char s[1000];

    ME = fopen("file.c", "r");

    FILE *displayarray[5];

    displayarray[0] = ME;

    while (fgets(s,1000 , displayarray[0])!=NULL)
        printf("%s",s);
    fclose(displayarray[0]);

    return 0;
}

freddielj · Mar 29th, 2005, 11:40 AM

thanks spydoor

Mar 29th, 2005, 7:55 AM	#1
freddielj Newbie Join Date: Mar 2005 Posts: 18 Rep Power: 0	Solve Declaration type i wanna store pointers of type file in an Array but declaration of an array of type file gives me the error error C2275: 'FILE' : illegal use of this type as an expression any ideas how i should store them? Thanks Freddie

Mar 29th, 2005, 9:14 AM	#5
spydoor Programmer Join Date: Feb 2005 Posts: 64 Rep Power: 4	you declared each FILE as a pointer, so your array should be of type FILE * (Toggle Plain Text) FILE displayarray[numberofdisplays]; FILE displayarray[numberofdisplays];

Mar 29th, 2005, 11:16 AM	#9
spydoor Programmer Join Date: Feb 2005 Posts: 64 Rep Power: 4	is it possibly somewhere else in your code. This simple example worked for me on 2 different compilers (Toggle Plain Text) #include <stdio.h> int main() { FILE ME; char s[1000]; ME = fopen("file.c", "r"); FILE displayarray[5]; displayarray[0] = ME; while (fgets(s,1000 , displayarray[0])!=NULL) printf("%s",s); fclose(displayarray[0]); return 0; } #include <stdio.h> int main() { FILE ME; char s[1000]; ME = fopen("file.c", "r"); FILE displayarray[5]; displayarray[0] = ME; while (fgets(s,1000 , displayarray[0])!=NULL) printf("%s",s); fclose(displayarray[0]); return 0; }

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Mar 29th, 2005, 8:11 AM	#2
Berto Programming Guru Join Date: Aug 2004 Posts: 1,022 Rep Power: 6	anychance of seeing the code ?

Mar 29th, 2005, 8:17 AM	#3
freddielj Newbie Join Date: Mar 2005 Posts: 18 Rep Power: 0	FILE BernardoBellotto; FILE JacopoLigozzi; FILE LudoviceCarracci; FILE Monalisa; BernardoBellotto = fopen("BernardoBellotto.txt", "r"); JacopoLigozzi = fopen("JacopoLigozzi.txt", "r"); LudoviceCarracci = fopen("LudoviceCarracci.txt", "r"); Monalisa = fopen("Monalisa.txt", "r"); FILE displayarray[numberofdisplays]; displayarray[0] = BernardoBellotto; displayarray[1] = JacopoLigozzi; displayarray[2] = LudoviceCarracci; displayarray[3] = Monalisa;

Mar 29th, 2005, 9:03 AM	#4
Berto Programming Guru Join Date: Aug 2004 Posts: 1,022 Rep Power: 6	where does this number of displays come from?

Mar 29th, 2005, 9:38 AM	#6
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 6	Exactly, and numberofdisplays has to be a true constant. displayarray[0] = BernardoBellotto; displayarray[1] = JacopoLigozzi; displayarray[2] = LudoviceCarracci; displayarray[3] = Monalisa; It has to point to the memory address, it can't try and store it again.

Mar 29th, 2005, 10:05 AM	#7
freddielj Newbie Join Date: Mar 2005 Posts: 18 Rep Power: 0	numberofdiplays is defined as a global, an d cool hopefully its works for me thanks for the help thou Fred

Mar 29th, 2005, 10:41 AM	#8
freddielj Newbie Join Date: Mar 2005 Posts: 18 Rep Power: 0	FILE *displayarray[numberofdisplays]; gives me error C2275: 'FILE' : illegal use of this type as an expression numberofdisplays is global.

Mar 29th, 2005, 11:40 AM	#10
freddielj Newbie Join Date: Mar 2005 Posts: 18 Rep Power: 0	thanks spydoor

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Programming Forums > Application Development > C++

Solve Declaration type