Article View: comp.os.os2.programmer
Article #3285Re: fread()/fseek()/fwrite() problem?
From: Bill Sarantakos
Date: Tue, 05 Jan 1993 23:51
Date: Tue, 05 Jan 1993 23:51
22 lines
1365 bytes
1365 bytes
In <C0Dz8s.4u4@panix.com> Larry Salomon Jr. writes:
>It is my code or is the following a problem?
>
>pfFile=fopen("ABCD","r+b");
>fread(achLine,sizeof(achLine),1,pfFile);
>fread(&sMyStruct,sizeof(sMyStruct),1,pfFile);
>
>/* @@ */
>sMyStruct.bCheckedout=TRUE;
>fseek(pfFile,sizeof(achLine),SEEK_SET);
>fwrite(&sMyStruct,sizeof(sMyStruct),1,pfFile);
>/* @@ */
Before one can output/input after having input/output, a fflush()
or file positioning function (fseek, fsetpos, or rewind) must be called
(see top of page 131 in ANSI spec). While the above code appears to
be OK, perhaps the context from which it was taken is incorrect. If
you think the runtime is being over-zealous and disallowing this
case (since using rewind() actually works), send a test case to
cset2@vnet.ibm.com along with a note explaining the problem.
Bill Sarantakos OS/2 C++ Compiler Development Toronto, Ontario
Technical Details
Message-ID:
<19930105.155207.701@almaden.ibm.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!vnet.ibm.comReferences:
<C0Dz8s.4u4@panix.com>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!vnet.ibm.com From: bigbill@vnet.ibm.com (Bill Sarantakos) Message-ID: <19930105.155207.701@almaden.ibm.com> Date: Tue, 5 Jan 93 18:51:56 EST Newsgroups: comp.os.os2.programmer,comp.lang.c Subject: Re: fread()/fseek()/fwrite() problem? Organization: IBM Canada Laboratory Disclaimer: This posting represents the poster's views, not those of IBM News-Software: UReply 3.0 References: <C0Dz8s.4u4@panix.com> Lines: 22