更快地写入文件的方式 [英] Faster way to write in a file
问题描述
目前，我在fprintf
函数的文件中写了一个带签名的long long：
签名long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0;
pDataRx =（签名长long *）malloc（sizeof（签名长多头）*
（65536 * 16 * 8）/ 8）;
for（k = 0; k< DataAvail / 8; k ++）{
fprintf（pFilec，"％lli \ t"，pData [k]）;
}
问题是函数非常慢！
在几个论坛中，我看到fwrite函数更好，但是我不知道如何使用它。
你能帮助我吗？
Tk。
Hi,
Currently, I write an signed long long in a file with the fprintf
function:
signed long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0 ;
pDataRx = (signed long long *) malloc ( sizeof(signed long long ) *
(65536*16*8) / 8);
for ( k = 0; k < DataAvail/8; k ++ ) {
fprintf ( pFilec, "%lli\t", pData[k]);
}
The problem is that function is very very slow !
In several forums, I saw that fwrite function is better, but I don''t
know how to use it.
Can you help me, please ?
Tk.
推荐答案
LilacSkin写道：
LilacSkin wrote:
目前，我在fprintf
函数的文件中写了一个带签名的long long：
签名l ong long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0;
pDataRx = （签名长long *）malloc（sizeof（签名长）*
（65536 * 16 * 8）/ 8）;
for（k = 0; k< DataAvail / 8; k ++）{
fprintf（pFilec，"％lli \ t"，pData [k]）;
}
问题是函数非常慢！
在几个论坛中，我看到fwrite函数更好，但我不是
知道如何使用它。
你能帮助我吗？
Hi,
Currently, I write an signed long long in a file with the fprintf
function:
signed long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0 ;
pDataRx = (signed long long *) malloc ( sizeof(signed long long ) *
(65536*16*8) / 8);
for ( k = 0; k < DataAvail/8; k ++ ) {
fprintf ( pFilec, "%lli\t", pData[k]);
}
The problem is that function is very very slow !
In several forums, I saw that fwrite function is better, but I don''t
know how to use it.
Can you help me, please ?
size_t rc;
rc = fwrite（pData，sizeof * pData，1048576UL，pFilec）;
if（rc！= 1048576）{
puts（Write error。）;
/ * ... * /
}
size_t rc;
rc = fwrite(pData, sizeof *pData, 1048576UL, pFilec);
if (rc != 1048576) {
puts("Write error.");
/* ... */
}
13fév，13：47，santosh< santosh .... @ gmail.comwrote：
On 13 fév, 13:47, santosh <santosh....@gmail.comwrote:
LilacSkin写道：
LilacSkin wrote:
Hi,
目前，我在fprintf
函数的文件中写了一个带符号的long long：
Currently, I write an signed long long in a file with the fprintf
function:
signed long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0;
signed long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0 ;
pDataRx =（签名长long *）malloc（sizeof（签名长多头）*
（65536 * 16 * 8）/ 8）;
pDataRx = (signed long long *) malloc ( sizeof(signed long long ) *
(65536*16*8) / 8);
for（k = 0; k< DataAvail / 8; k ++）{
fprintf（pFilec， "％lli \ t"，pData [k]）;
}
for ( k = 0; k < DataAvail/8; k ++ ) {
fprintf ( pFilec, "%lli\t", pData[k]);
}
问题是函数是非常慢！
The problem is that function is very very slow !
在几个论坛中，我看到fwrite函数更好，但我不知道
知道如何使用它。
你能帮帮我吗？
In several forums, I saw that fwrite function is better, but I don''t
know how to use it.
Can you help me, please ?
size_t rc;
rc = fwrite（pData，sizeof * pData，1048576UL，pFilec）;
if（rc！= 1048576）{
puts（Write error。）;
/ * ... * /
}
size_t rc;
rc = fwrite(pData, sizeof *pData, 1048576UL, pFilec);
if (rc != 1048576) {
puts("Write error.");
/* ... */
}
它不起作用！
It''s not working !
LilacSkin写道：
LilacSkin wrote:
13fév，13：47，santosh< santosh .... @ gmail.comwrote：
On 13 fév, 13:47, santosh <santosh....@gmail.comwrote:
> ; LilacSkin写道：
>LilacSkin wrote:
Hi,
目前，我写了一个签名长的在一个带有fprintf的文件中
函数：
Currently, I write an signed long long in a file with the fprintf
function:
签长长* pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0;
signed long long * pData = NULL;
unsigned long long k = 0;
unsigned long DataAvail = 0 ;
pDataRx =（签名长long *）malloc（sizeof（签名长多头）*
（65536 * 16 * 8）/ 8）;
pDataRx = (signed long long *) malloc ( sizeof(signed long long ) *
(65536*16*8) / 8);
for（k = 0; k< DataAvail / 8; k ++）{
fprintf（pFilec， "％lli \ t"，pData [k]）;
}
for ( k = 0; k < DataAvail/8; k ++ ) {
fprintf ( pFilec, "%lli\t", pData[k]);
}
问题是函数是非常慢！
The problem is that function is very very slow !
在几个论坛中，我看到fwrite函数更好，但是我
我不知道如何使用它。
你能帮帮我吗？
In several forums, I saw that fwrite function is better, but I
don''t know how to use it.
Can you help me, please ?
size_t rc;
rc = fwrite（pData，sizeof * pData，1048576UL，pFilec）;
if（rc！= 1048576）{
puts（写错误。）;
/ * ... * /
}
size_t rc;
rc = fwrite(pData, sizeof *pData, 1048576UL, pFilec);
if (rc != 1048576) {
puts("Write error.");
/* ... */
}
它不起作用！
It''s not working !
到底是怎么回事？您是否检查过elements参数是否正确？什么
是fcrite（）调用后rc的值？ pFilec是否指向
您有适当权限的有效流？
How exactly? Did you check that the elements parameter is correct? What
is the value that rc has after the fwrite() call? Is pFilec pointing to
a valid stream for which you have appropriate permissions?
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