其中sound.c 用于錄音和回放。其中特別需要注意的是:1。目前聲卡似乎不能打開全雙工，所以如果fd = Open("/dev/dsp", O_RDWR) ，則無法錄音和回放。只能分別設置RDONLY和WRONLY。即半雙工方式。否則，就是在錄音的時候可以聽見，但是無法回放。分析下來似乎是IIC總線中只分配了一個通道給聲卡，或者是只啟用了一個通道，所以無法錄音和放音同步進行。解決方法就是分別以RDONLY方式打開進行錄音和WRONLY方式打開進行放音。 Sound1.c用于將錄音保存在test.wav文件中，并利用cast test.wav > /dev/sound/dsp回放文件。此處需要注意的是，錄音頻率必須是44100才能正確回放。否則就會出現類似快放的效果。分析應該是cast方式利用了dsp的默認播放頻率44100，所以如果錄音的時候低于這個頻率，這放的時候就會快放。 此外，設置采樣率的時候必須設置成16bit，否則會提示出錯。原因尚不知道，估計是與聲卡有關。
上傳時間： 2013-12-31
上傳用戶：cc1
What Does the code DO? Sometimes we may desire to hide our file contents from others.One of the possible way is encrypting these files.Here a simple encryption technique is used(In VB - The same technique can be implemented in "c" also.) Program flow Explained * Open the File to be encrypted for Binary Access Read(Say Source File) * Open a temparory file where encrypted data is stored for Binary Access Write(Say Destination File) * Loop through the Source File Byte by Byte * For each byte read from the file, Complement the data. (Using Not operator (in C we have to use "~" operator) * Write Complemented Data to Destination File * Delete the Source File * Rename Destination file as Source File(Now Encryption is over)
標簽： Sometimes the contents desire
上傳時間： 2013-12-25
上傳用戶：playboys0
This C/C++ code example demonstrates porting standard C software to the S60 platform. In this example, an Open source FTP library (ftplib and qftp) written in C has been ported to Open C. In addition, a simple UI has been written in Symbian C++ to provide a GUI application.
標簽： demonstrates platform standard software
上傳時間： 2014-10-25
上傳用戶：cc1
mmsv1.2 文檔，可以在Open mobile alliance free download
上傳時間： 2015-12-18
上傳用戶：trepb001
MD5加密算法java代碼，歡迎下載,歡迎Open
上傳時間： 2013-12-01
上傳用戶：qunquan
對于單個控件,COMPONET-->INSTALL COMPONENT..-->PAS或DCU文件-->INSTALL。 2.對于帶*.DPK文件的控件包,FILE-->Open(下拉列表框中選*.DPK)-->INSTALL即可。 3.對于帶*.BPL文件的控件包,INSTALL PACKAGES-->ADD-->BPL文件名即可。 4.如果以上INSTALL按鈕為失效的話,試試COMPILE按鈕。 5.是RUN TIME LIB則在OPTION下的PACKAGES下的RUNTIMEPACKES加之。 如果編譯時提示文件找不到的話,一般是控件的安裝目錄不在DELPHI的LIB目錄中, 有兩種方法可以解決： 1.反安裝的源文件拷入到DELPHI的LIB目錄下。 2.或者TOOLS-->ENVIRONMENT OPTIONS中把控件源代碼路徑加入到DELPHI的LIB目錄中即可。
標簽： INSTALL gt COMPONENT COMPONET
上傳時間： 2013-12-25
上傳用戶：ljmwh2000
學會對文件的記錄鎖定，及解鎖。#include <stdio.h> #include <unistd.h> #include <fcntl.h> int main() { int fd int i struct { char name[20] uint ID int age } myrec fd =Open("name", O_RDWR|O_CREAT, 0755) if (fd == -1) return -1 printf("Input your name:") scanf("％s", myrec.name) printf("Inpute your ID :") scanf("％d", &myrec.ID) printf("Input your age :") scanf("％d", &myrec.age) lseek(fd, 0,SEEK_END) lockf(fd, 1, 0) write(fd, (void *)&myrec, sizeof(myrec)) lockf(fd, 0 ,0) return 0 } 執行命令cc lock.c –o lock.out Chmod +x lock.out ./lock.out
標簽： 記錄
上傳時間： 2016-01-04
上傳用戶：亞亞娟娟123
Linux 2.4.18 s3c2440 led driver 使用dev-C++撰寫，需要linux 2.4.18 kernel include，編譯完成後產生led module。 insmod main.o //安裝模組 mknod /dev/leds c 221 0 使用方法： int main(int argc, char *argv[]) { int testdev //led test... testdev = Open("/dev/QuickMarkLed",O_RDWR) ioctl(testdev, 2, 1) //ioctl(device, led number, Open/close) Open=1 ioctl(testdev, argv[1][0]- 0 , argv[2][0]- 0 ) //ioctl(device, led number, Open/close) Open=1 close(testdev) return 0 }
標簽： s3c2440 driver Linux dev-C
上傳時間： 2014-01-01
上傳用戶：qlpqlq
The Tremor Vorbis I stream and file decoder provides an embeddable, integer-only library [libvorbisidec] intended for decoding all current and future Vorbis I compliant streams. The Tremor libvorbisidec library exposes an API intended to be as similar as possible to the familiar vorbisfile library included with the Open source Vorbis reference libraries distributed for free by Xiph.org. Tremor can be used along with any ANSI compliant stdio implementation for file/stream access, or use custom stream i/o routines provided by the embedded environment. Both uses are described in detail in this documentation.
標簽： integer-only embeddable libvorbisi provides
上傳時間： 2013-12-25
上傳用戶：lindor
The Tremor Vorbis I stream and file decoder provides an embeddable, integer-only library [libvorbisidec] intended for decoding all current and future Vorbis I compliant streams. The Tremor libvorbisidec library exposes an API intended to be as similar as possible to the familiar vorbisfile library included with the Open source Vorbis reference libraries distributed for free by Xiph.org. ogg vorbis decoder, evc project Tremor can be used along with any ANSI compliant stdio implementation for file/stream access, or use custom stream i/o routines provided by the embedded environment. Both uses are described in detail in this documentation.
標簽： integer-only embeddable libvorbisi provides
上傳時間： 2016-01-21
上傳用戶：gengxiaochao
