add text in existing file problam
in [Win32 API]
|
From: r_z_aret on 28 Oct 2009 12:41 On Tue, 27 Oct 2009 12:59:32 -0700 (PDT), "B.S" <giobs111(a)gmail.com> wrote: >It returned " The system cannot find the file specified." > >thanks for this code. > >i use TCHAR all time and i hadn't any problem and whats differens with >TCHAR and char i think they are same. No, they are NOT. Sometimes the difference is trivial, and sometimes it is decidedly not. Although tchar.h is not meant for humans (I sure needed several attempts to understand it), it defines TCHAR and relatives, so understanding it will help you a lot. ----------------------------------------- To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message). Robert E. Zaret, eMVP PenFact, Inc. 20 Park Plaza, Suite 400 Boston, MA 02116 www.penfact.com Useful reading (be sure to read its disclaimer first): http://catb.org/~esr/faqs/smart-questions.html
From: B.S on 29 Oct 2009 14:17 Thanks but in this program i need that file was all time opend but i will notise it in ather projects. and its realy sucks that it's imposible to delete some bytes. and can anyone tell me where can i find more about TCHAr and char. I whant to know where what use.
From: ScottMcP [MVP] on 29 Oct 2009 16:37 On Oct 29, 2:17 pm, "B.S" <giobs...(a)gmail.com> wrote: > Thanks but in this program i need that file was all time opend but i > will notise it in ather projects. and its realy sucks that it's > imposible to delete some bytes. That is inherent is disk files. Disks can't move the bits around, so code must be written to do it in memory and then write the new configuration to disk. > and can anyone tell me where can i find more about TCHAr and char. I > whant to know where what use. http://msdn.microsoft.com/en-us/library/ey142t48(VS.80).aspx
From: Friedel Jantzen on 30 Oct 2009 03:31 Am Thu, 29 Oct 2009 11:17:13 -0700 (PDT) schrieb B.S: > Thanks but in this program i need that file was all time opend but i You could use memory-mapped files, but perhaps too complicated. See CreateFileMapping, MapViewOfFile. > will notise it in ather projects. and its realy sucks that it's > imposible to delete some bytes. You are right, file handling is complicated. As you use fixed record lengths, you could do it like the DBASE dbf files: The records are not deleted really, only a marker is set. All records, which were marked for deleting, are deleted together on a compacting eventually. > and can anyone tell me where can i find more about TCHAr and char. I > whant to know where what use. See the link posted by Scott. Using TCHAR, you can write code for ANSI _and_ Unicode (see my last posting): TCHAR programa[MAX_PATH] = _T("C:\\Programs\\wipeall.exe"); If you call a Win32 API passing a string, the correct version A or W of the Api will be chosen depending on the defines. Very easy so far. Then you have a file with ANSI string data in a Unicode app and want to pass it to an Api function: Fails or looks like Chinese. You have to convert it to Unicode with MultiByteToWideChar before. If you write the Unicode version of the string programa to a file, you write the bytes C \0 : \0 .... \0 \0 If you want to write ANSI, you must convert it before with WideCharToMultiByte. It is not possible with a cast, this would result in the ANSI string "C". HTH, Friedel
From: Todd Aspeotis on 11 Nov 2009 03:43
Don't use a type without knowing what it does? If you have UNICODE defined then TCHAR will be wchar_t, not char. http://msdn.microsoft.com/en-us/library/c426s321%28VS.71%29.aspx "B.S" <giobs111(a)gmail.com> wrote in message news:7304c0fc-183c-4c80-a83a-3089fe0650a9(a)k13g2000prh.googlegroups.com... > Thanks but in this program i need that file was all time opend but i > will notise it in ather projects. and its realy sucks that it's > imposible to delete some bytes. > > > and can anyone tell me where can i find more about TCHAr and char. I > whant to know where what use. |