奇怪的fwrite [英] Strange fwrite
问题描述
我写了一个小程序，它做了类似tftp的事情 - 转移了
文件和一些聊天，无论如何我遇到了fwrite的问题，这里是我的一个
片段。代码：
while（length> 0）{
putchar（''。''）; //这些用于错误检查
if（length< = bsize）{//缓冲区大于剩余文件
realloc（缓冲区，长度* sizeof（char） ）; //调整大小缓冲区
保持
rec = recv（袜子，缓冲区，长度，0）; //收到数据
p = buffer; //将p设置为缓冲区
i = length; //设置我保持
而（i> 128）{//分解成128字节块
putchar（''。''）;
fwrite（p，sizeof（char），128，writefile）;
p = p + 128; //转到下一个128字节
i = i - 128;
}
fwrite（p，sizeof（char），i，writefile） ;
} else {
rec = recv（sock，buffer，bsize，0）; // bsize是1024
putchar（''。''）;
p =缓冲区;
for（i = 0; i< 8 ; i ++）{
fwrite（p，sizeof（char），128，writefile）;
putchar（''。''）;
p = p + 128;
}
}
长度是要传输的整个文件的长度，bsize是
接收缓冲区的大小，sock是一个socket，p是指针，rec和
i是整数。
现在来了我的问题我编译了这个代码并在Windows下运行它
2000（作为接收者）它挂在fwrite调用（因为我
见2点）然后我将程序复制到我的WinXP机器上，它很快地运行了
!!!
有没有人有什么想法那里有什么问题？我花了我6个小时直到
i发现这不是我的错（之后我在winXP上尝试过）
要添加的一件事是最新的那个奇怪的分解成128块
块。我运行了一个小测试程序，用fwrite一次增加了写入的
字节的数量，我得到一个大约140的错误，所以我认为
一次认为128个字节应该是保存。
非常感谢你。
I wrote a small program which does something like tftp - transfering
files and some chat, anyway i got a problem with fwrite, here is a
snippet of my code:
while(length > 0) {
putchar(''.''); //These were for error checking
if(length <= bsize) { //Buffer is bigger than remaining File
realloc(buffer,length * sizeof(char)); //resize buffer
to remain
rec = recv(sock,buffer,length,0); //recieve Data
p = buffer; //set p to buffer
i = length; //set i to remain
while(i > 128) { //break down into 128byte blocks
putchar(''.'');
fwrite(p,sizeof(char),128,writefile);
p = p + 128; //go to next 128 bytes
i = i - 128;
}
fwrite(p,sizeof(char),i,writefile);
} else {
rec = recv(sock,buffer,bsize,0); //bsize is 1024
putchar(''.'');
p = buffer;
for(i=0;i<8;i++) {
fwrite(p,sizeof(char),128,writefile);
putchar(''.'');
p = p + 128;
}
}
length is the length of the whole file to be transmitted, bsize is the
size of the recieve buffer, sock is a socket, p is as pointer, rec and
i are integers.
And now comes my Problem i compiled this code and ran it under Windows
2000 (being the reciever) and it hangs at the fwrite calls (since I
see 2 dots) then i copied the programm to my WinXP machine and it ran
happily!!!
Has Anybody got any Idea whats wrong there??? I costed me 6 hours till
i figured out that it wasn''t my fault (after that i tried it on winXP)
One thing to add is whats up with that strange breaking down into 128
Blocks. I ran a small test programm ever increasing the number of
bytes written at once with fwrite, and i got an Error around 140 so i
thought 128 bytes at once should be save.
Thank you soo much.
推荐答案
" SW1" < SC ********** @ yahoo.de>在消息中写道
news：79 ************************** @ posting.google.c om ...
"SW1" <sc**********@yahoo.de> wrote in message
news:79**************************@posting.google.c om...
我写了一个小程序，它做的事情就像tftp - 转移文件和一些聊天，无论如何我遇到了fwrite的问题，这里是我的代码片段：
while（长度> 0）{
putchar（''。''）; //这些用于错误检查
if（length< = bsize）{//缓冲区大于剩余文件
realloc（缓冲区，长度* sizeof（char））; //调整大小缓冲区
保留
I wrote a small program which does something like tftp - transfering
files and some chat, anyway i got a problem with fwrite, here is a
snippet of my code:
while(length > 0) {
putchar(''.''); //These were for error checking
if(length <= bsize) { //Buffer is bigger than remaining File
realloc(buffer,length * sizeof(char)); //resize buffer
to remain
在哪里存储realloc的返回值？
Where do you store the return of realloc?
没有，但它确实没问题，我唯一的问题是
fwrite !!!即使我没有重新分配，fwrite也不起作用!!
Nowhere, but it does it alright, the only problem i have is with
fwrite!!! fwrite doesn''t work even if i don''t realloc!!
" SW1" < SC ********** @ yahoo.de>在消息中写道
news：79 ************************** @ posting.google.c om ...
"SW1" <sc**********@yahoo.de> wrote in message
news:79**************************@posting.google.c om...
无处，但它没关系，我唯一的问题是用
fwrite !!!即使我没有realloc，fwrite也行不通!!
Nowhere, but it does it alright, the only problem i have is with
fwrite!!! fwrite doesn''t work even if i don''t realloc!!
NO！
修复你的所有问题调试之前的第一个！
了解F'' CODE！
GO HOME！
NO!
FIX ALL YOUR PROBLEMS FIRST BEFORE DEBUGING!
LEARN TO F''ING CODE!
GO HOME!
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