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標題: problem in C language write .txt [打印本頁]

作者: cwfw 時間: 2012-4-2 03:34 PM 標題: problem in C language write .txt

please read the code:

when I ready try to generate a .hex file for this code, the system said 'FILE' and 'fp' are undefined identifier. Do anyone know what happen?

作者: Invi6666 時間: 2012-4-2 10:34 PM

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作者: cwfw 時間: 2012-4-3 05:46 AM

Invi6666 發表於 2012-4-2 10:34 PM
What compiler you use？ I don't have any problem after compiled your program

Keil uVision2

I use this to generate a .hex file.

作者: mp0801 時間: 2012-4-3 06:56 AM

I think Keil uVision2 is not support FILE function. You need ensure keil c library
have FILE function and include it.

作者: cwfw 時間: 2012-4-3 06:34 PM

mp0801 發表於 2012-4-3 06:56 AM
I think Keil uVision2 is not support FILE function. You need ensure keil c library
have FILE functio ...

I am sorry, can you tell me more. Do I need to include some library or use other command?

補充內容 (2012-4-3 06:36 PM):
what library do I miss?

作者: mp0801 時間: 2012-4-3 09:03 PM

Keil C is support embedded system platform. Just like 8051, ARM ......
It c library is not same with computer C(GCC).
Keil C have not all C(GCC) library function.
You use FILE maybe include <stdio.h>, but Keil C <stdio.h> must have FILE function.
I remember Keil C is not support FILE function.
If you want create HEX file, you can try computer C platform.(window,linux,...)

作者: cwfw 時間: 2012-4-4 05:11 PM

mp0801 發表於 2012-4-3 09:03 PM
Keil C is support embedded system platform. Just like 8051, ARM ......
It c library is not same with ...

sorry, don't understand.
computer C plarform?
you mean using keil C in linux or what???????
can window 7 ok?

作者: EdisonX 時間: 2012-4-5 03:27 AM

cwfw 發表於 2012-4-4 05:11 PM
sorry, don't understand.
computer C plarform?
you mean using keil C in linux or what???????

what reason makes you to use keil C ?

作者: mp0801 時間: 2012-4-5 06:37 AM

window 7 is OK, and I design some thing for embedded system.
So I have some experience for using Keil C

作者: cwfw 時間: 2012-4-5 08:07 AM

EdisonX 發表於 2012-4-5 03:27 AM
what reason makes you to use keil C ?

it's one part of my project actually.

作者: EdisonX 時間: 2012-4-5 04:22 PM

execute me, can I answer those in Chinese ? Orz

I don't know why using file stream instructions in embedded system ,
but I think this action is not rational.

FILE struct is defined in <stdio.h> header
but Keil C has no this header, the reason as below description.

Microprocessor is not personal computer (PC).
Is there any disc on the system ?

If not, it means there is no disc, no operation system, no document system.
how can we expect that , Keil C has file stream instructions ?

finally, sorry for my poor English.

作者: cwfw 時間: 2012-4-5 04:57 PM

EdisonX 發表於 2012-4-5 04:22 PM
execute me, can I answer those in Chinese ? Orz

I don't know why using file stream instructions in ...

you can answer in english, of course.
are you saying that even the full version of keil C have no this header?

作者: mp0801 時間: 2012-4-5 06:19 PM

Yes or No ? Actually, Keil C is not support file system, but I think you
can search third party distribution. Maybe you can find it or write a
new FILE function for yourself.

作者: EdisonX 時間: 2012-4-5 07:00 PM

As mp0801 said,
" Keil C is not support file system " ,
even the full version of keil C has no those instructions ( or header ) .

作者: cwfw 時間: 2012-4-9 01:07 PM

mp0801 發表於 2012-4-5 06:19 PM
Yes or No ? Actually, Keil C is not support file system, but I think you
can search third party dist ...

I am sorry, you can answer in Chinese.
I want to ask what if I write the data to excel? will it work? because my project must use keli C, so I must find a way to store the data, in txt or in excel is ok.

補充內容 (2012-4-9 01:18 PM):
can I use other code besides the "FILE*fopen" to do so?

作者: cwfw 時間: 2012-4-9 01:17 PM

EdisonX 發表於 2012-4-5 07:00 PM
As mp0801 said,
" Keil C is not support file system " ,
even the full version of keil C has no th ...

作者: EdisonX 時間: 2012-4-9 06:12 PM

我以中文方式把上述的結論述敘一遍。

8051 / ARM 這些 MicroProcessor ，在他們本身的硬體架構裡面，找不到任何與硬碟有關的硬體，更遑論「檔案系統」之既念，故正常而言，Keil-C 並不附關於 file stream 相關函式也是可以理解的。

當然你說的 excel 本身也是一種檔案，以自己的格式方式存入而已，所以基本上這行為是辦不到的。另外用 FILE * 方式開啟 excel 讀取數值基本上需要費相當大的功夫，通常都是使用其他 IDE ，套用 COM componment 概念下去解，這更是不可能完成的事。 (另希望你說的是 csv 檔，而不是 .xls(x) 檔)

而 mp0801 版友所言之方式，我認為應是找尋是否有廠商，專門為 Keil C 開發 file stream 之相關 library，但這前提也必須是：整個硬體系統要包含了硬碟 (基本上認為這前提不怎麼可能發生...)。

我不知究竟有什麼苦衷一定要用 Keil-C 讀檔，但我認為或許要做的，是讀取 ROM value，可能較為合理。

有誤請指正。

作者: mp0801 時間: 2012-4-9 06:21 PM

^^ maybe my English is not good.
below is my suggest.
KEIL C中沒有FILE的實作,造成無法建立出對應WINDOWS系統的檔案結構
雖然TXT只是一般的文字檔,但沒檔案結構依然無法讓系統存取,因為WINDOWS
必須要有對應的檔案結構才能存取資料,不然看起來只是一堆二進位資料.
若你要在KEIL C下建立檔案也可以考慮植入作業系統來建立相對應的平台,但
我想這似乎又有一點小題大作.
以上是我個人見解,提供你參考,或許還有其人有更好的答案.
另外你也可以提供你要實作的真正需求,或許可以提供你最佳解.

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