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关于多线程的问题!

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关于多线程的问题![已结贴,结贴人:qqqqqqpppp]

发表于：2007-01-21 14:42:54 楼主

程序根据不同条件给同一函数a传递不同参数,启动多线程,当在单线程条件下,函数a正常运行,但是在多线程条件下,只有最后启动的线程工作,而且也不能保证正常运行.前面启动的线程根本不工作,根据createthread和getlasterror返回值,都显示正常.这到底是怎么回事呢?请各位高手给些建议!小弟比较穷,只能给20分了!谢谢!

发表于：2007-01-21 14:51:271楼得分:0

猜点代码吧。

发表于：2007-01-21 14:54:122楼得分:0

“帖”，奇怪，怎么打成“猜”。。。。。

发表于：2007-01-21 16:43:033楼得分:0

void winapi monitordirectory（lpstr path)

{

handle hdir;
char notify[1024], tmp[256];
dword cbbytes,i;
char ansichar[3];
wchar_t unicodechar[2];
file_notify_information *pnotify=（file_notify_information *)notify;
file_notify_information *tmp;
strcpy（tmp , path);
hdir = createfile（ tmp ,file_list_directory, file_share_read ¦ file_share_write ¦ file_share_delete, null, open_existing, file_flag_backup_semantics ¦ file_flag_overlapped, null);
if （hdir == invalid_handle_value) { printf（ "hdir:invalid_handle_value ");
return;
}
while （true)
{
if（readdirectorychangesw（hdir, notify, sizeof（notify), false, file_notify_change_file_name ¦ file_notify_change_last_write, &cbbytes, null, null))
{
// printf（ "readdirectorychangesw success\n ");
tmp = pnotify;
do
{
switch（tmp-> action)
{
case file_action_added: printf（ "directory/file added - "); break;
case file_action_removed: printf（ "directory/file removed - "); break;
case file_action_modified: printf（ "directory/file modified - "); break;
case file_action_renamed_old_name: printf（ "directory/file old name - "); break;
case file_action_renamed_new_name: printf（ "directory/file new name - "); break;
default: break;
}
//end switch
for（i=0;i <tmp-> filenamelength/2;i++)
{
unicodechar[0]=tmp-> filename[i];
unicodechar[1]=0;
zeromemory（ansichar,3);
widechartomultibyte（cp_acp,0,unicodechar,-1,ansichar,3,null,null);
printf（ "%s ",ansichar);
}
printf（ "\n ");
if（tmp-> nextentryoffset !=0)
{
i = tmp-> nextentryoffset;
tmp = （pfile_notify_information) （（lpbyte)tmp+i);
} else break; }while（1); }
//end if
else printf（ "readdirectorychangesw error\n ");
}//end while

}
代码如上,也是从网上copy来的,给它传递不同的参数,就监控了不同的文件夹,但是多线程的时候就不行了.

发表于：2007-01-22 14:45:414楼得分:20

我试了，代码没问题啊？？

#include "stdafx.h "

uint winapi monitordirectory（void *param);

int main（int argc, char* argv[])
{
char spath[256];
char spath2[256];
strcpy（spath, "c:\\ ");
strcpy（spath2, "d:\\ ");

_beginthreadex（null,0,monitordirectory,spath,0,null);
_beginthreadex（null,0,monitordirectory,spath2,0,null);
while （true) {
sleep（10000);
}
return 0;
}

uint winapi monitordirectory（void *param)

{

handle hdir;
char notify[1024], tmp[256];
dword cbbytes,i;
char ansichar[3];
wchar_t unicodechar[2];
file_notify_information *pnotify=（file_notify_information *)notify;
file_notify_information *tmp;
strcpy（tmp , （char*)param);
hdir = createfile（ tmp ,file_list_directory, file_share_read ¦ file_share_write ¦ file_share_delete, null, open_existing, file_flag_backup_semantics ¦ file_flag_overlapped, null);
if （hdir == invalid_handle_value) { printf（ "hdir:invalid_handle_value ");
return 0;
}
while （true)
{
if（readdirectorychangesw（hdir, notify, sizeof（notify), false, file_notify_change_file_name ¦ file_notify_change_last_write, &cbbytes, null, null))
{
// printf（ "readdirectorychangesw success\n ");
tmp = pnotify;
do
{
switch（tmp-> action)
{
case file_action_added: printf（ "\ndirectory/file added - "); break;
case file_action_removed: printf（ "\ndirectory/file removed - "); break;
case file_action_modified: printf（ "\ndirectory/file modified - "); break;
case file_action_renamed_old_name: printf（ "\ndirectory/file old name - "); break;
case file_action_renamed_new_name: printf（ "\ndirectory/file new name - "); break;
default: break;
}
//end switch
for（i=0;i <tmp-> filenamelength/2;i++)
{
unicodechar[0]=tmp-> filename[i];
unicodechar[1]=0;
zeromemory（ansichar,3);
widechartomultibyte（cp_acp,0,unicodechar,-1,ansichar,3,null,null);
printf（ "%s ",ansichar);
}
if（tmp-> nextentryoffset !=0)
{
i = tmp-> nextentryoffset;
tmp = （pfile_notify_information) （（lpbyte)tmp+i);
} else break; }while（1); }
//end if
else printf（ "readdirectorychangesw error\n ");
}//end while
return 0;
}

发表于：2007-01-22 15:50:465楼得分:0

谢谢microyzy了,原来是工程设置里的问题,真的谢谢啦.还有个一个小问题,就是readdirectorychangesw函数,为什么一个文件修改后,它会识别两次呢?再次谢谢啦!

发表于：2007-01-22 16:56:166楼得分:0

这个我8清楚啦，呵呵，这个函数我也没用过，可能跟你设置的参数有关吧：
file_notify_change_file_name ¦ file_notify_change_last_write

你换换参数试试

发表于：2007-01-22 19:04:257楼得分:0

试试先,不过还是很感谢啦,结贴老!

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