WinApi SetFileAttributes slow-motion call
Today I did some testing with the SetFileAttributes method and encountered a phenomenon I am not able to explain logically:
I wrote a short C program:
#include <stdio.h>
#include <windows.h>
int main()
{
char* strFile = L"C:\test.txt";
if (SetFileAttributes(strFile, FILE_ATTRIBUTE_HIDDEN))
{
printf("File attribute changed.n");
}
printf("%d", GetLastError());
}
It is a test program that hides a folder or icon, and I want to do it fast, but unfortunately the process takes 1-2s.
If I hide the icon manually via properties and the checkbox selection 'Hidden', the icon is hidden promptly.
So, what makes the winapi call take so many time? Is there a way to optimize the call?
Thanks.
c windows winapi icons
asked Nov 28 '18 at 13:25
d.rkd.rk
13
|
show 5 more comments
Today I did some testing with the SetFileAttributes method and encountered a phenomenon I am not able to explain logically:
I wrote a short C program:
#include <stdio.h>
#include <windows.h>
int main()
{
char* strFile = L"C:\test.txt";
if (SetFileAttributes(strFile, FILE_ATTRIBUTE_HIDDEN))
{
printf("File attribute changed.n");
}
printf("%d", GetLastError());
}
It is a test program that hides a folder or icon, and I want to do it fast, but unfortunately the process takes 1-2s.
If I hide the icon manually via properties and the checkbox selection 'Hidden', the icon is hidden promptly.
So, what makes the winapi call take so many time? Is there a way to optimize the call?
Thanks.
c windows winapi icons
asked Nov 28 '18 at 13:25
d.rkd.rk
13
Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
1
is exactly single call toSetFileAttributestake this time ? how you measure this ?
– RbMm
Nov 28 '18 at 14:17
3
no. i ask how many time take callSetFileAttributes. look like you even not measure this
– RbMm
Nov 28 '18 at 14:26
2
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
4
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try aGetFileAttributesafter the Set.
– Paul Ogilvie
Nov 28 '18 at 14:37
|
show 5 more comments
Today I did some testing with the SetFileAttributes method and encountered a phenomenon I am not able to explain logically:
I wrote a short C program:
#include <stdio.h>
#include <windows.h>
int main()
{
char* strFile = L"C:\test.txt";
if (SetFileAttributes(strFile, FILE_ATTRIBUTE_HIDDEN))
{
printf("File attribute changed.n");
}
printf("%d", GetLastError());
}
It is a test program that hides a folder or icon, and I want to do it fast, but unfortunately the process takes 1-2s.
If I hide the icon manually via properties and the checkbox selection 'Hidden', the icon is hidden promptly.
So, what makes the winapi call take so many time? Is there a way to optimize the call?
Thanks.
c windows winapi icons
asked Nov 28 '18 at 13:25
d.rkd.rk
13
Today I did some testing with the SetFileAttributes method and encountered a phenomenon I am not able to explain logically:
I wrote a short C program:
#include <stdio.h>
#include <windows.h>
int main()
{
char* strFile = L"C:\test.txt";
if (SetFileAttributes(strFile, FILE_ATTRIBUTE_HIDDEN))
{
printf("File attribute changed.n");
}
printf("%d", GetLastError());
}
It is a test program that hides a folder or icon, and I want to do it fast, but unfortunately the process takes 1-2s.
If I hide the icon manually via properties and the checkbox selection 'Hidden', the icon is hidden promptly.
So, what makes the winapi call take so many time? Is there a way to optimize the call?
Thanks.
c windows winapi icons
c windows winapi icons
asked Nov 28 '18 at 13:25
d.rkd.rk
13
asked Nov 28 '18 at 13:25
d.rkd.rk
13
asked Nov 28 '18 at 13:25
d.rkd.rk
13
asked Nov 28 '18 at 13:25
d.rkd.rk
13
asked Nov 28 '18 at 13:25
d.rkd.rk
13
13
Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
1
is exactly single call toSetFileAttributestake this time ? how you measure this ?
– RbMm
Nov 28 '18 at 14:17
3
no. i ask how many time take callSetFileAttributes. look like you even not measure this
– RbMm
Nov 28 '18 at 14:26
2
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
4
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try aGetFileAttributesafter the Set.
– Paul Ogilvie
Nov 28 '18 at 14:37
|
show 5 more comments
Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
1
is exactly single call toSetFileAttributestake this time ? how you measure this ?
– RbMm
Nov 28 '18 at 14:17
3
no. i ask how many time take callSetFileAttributes. look like you even not measure this
– RbMm
Nov 28 '18 at 14:26
2
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
4
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try aGetFileAttributesafter the Set.
– Paul Ogilvie
Nov 28 '18 at 14:37
Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
1
1
is exactly single call to
SetFileAttributes take this time ? how you measure this ?– RbMm
Nov 28 '18 at 14:17
is exactly single call to
SetFileAttributes take this time ? how you measure this ?– RbMm
Nov 28 '18 at 14:17
3
3
no. i ask how many time take call
SetFileAttributes. look like you even not measure this– RbMm
Nov 28 '18 at 14:26
no. i ask how many time take call
SetFileAttributes. look like you even not measure this– RbMm
Nov 28 '18 at 14:26
2
2
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
4
4
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try a
GetFileAttributes after the Set.– Paul Ogilvie
Nov 28 '18 at 14:37
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try a
GetFileAttributes after the Set.– Paul Ogilvie
Nov 28 '18 at 14:37
|
show 5 more comments
1 Answer
1
active
oldest
votes
First of all: Thanks for your suggestions. You were right, the explorer view / the desktop gets only updated after the time I did mention.
I was able to solve the slowmotion issue by using the winapi call SHChangeNotify. It is important to combine the uFlags part with SHCNF_FLUSH, then the change is visible instantly.
answered Nov 29 '18 at 7:30
d.rkd.rk
13
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1 Answer
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votes
1 Answer
1
active
oldest
votes
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oldest
votes
active
oldest
votes
First of all: Thanks for your suggestions. You were right, the explorer view / the desktop gets only updated after the time I did mention.
I was able to solve the slowmotion issue by using the winapi call SHChangeNotify. It is important to combine the uFlags part with SHCNF_FLUSH, then the change is visible instantly.
answered Nov 29 '18 at 7:30
d.rkd.rk
13
add a comment |
First of all: Thanks for your suggestions. You were right, the explorer view / the desktop gets only updated after the time I did mention.
I was able to solve the slowmotion issue by using the winapi call SHChangeNotify. It is important to combine the uFlags part with SHCNF_FLUSH, then the change is visible instantly.
answered Nov 29 '18 at 7:30
d.rkd.rk
13
add a comment |
First of all: Thanks for your suggestions. You were right, the explorer view / the desktop gets only updated after the time I did mention.
I was able to solve the slowmotion issue by using the winapi call SHChangeNotify. It is important to combine the uFlags part with SHCNF_FLUSH, then the change is visible instantly.
answered Nov 29 '18 at 7:30
d.rkd.rk
13
First of all: Thanks for your suggestions. You were right, the explorer view / the desktop gets only updated after the time I did mention.
I was able to solve the slowmotion issue by using the winapi call SHChangeNotify. It is important to combine the uFlags part with SHCNF_FLUSH, then the change is visible instantly.
answered Nov 29 '18 at 7:30
d.rkd.rk
13
answered Nov 29 '18 at 7:30
d.rkd.rk
13
answered Nov 29 '18 at 7:30
d.rkd.rk
13
answered Nov 29 '18 at 7:30
d.rkd.rk
13
13
add a comment |
add a comment |
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Try closing Explorer or have it look at another directory. It might be that the file or directory is considered in use.
– Paul Ogilvie
Nov 28 '18 at 13:33
1
is exactly single call to
SetFileAttributestake this time ? how you measure this ?– RbMm
Nov 28 '18 at 14:17
3
no. i ask how many time take call
SetFileAttributes. look like you even not measure this– RbMm
Nov 28 '18 at 14:26
2
Explorer probably only checks for or otherwise gets notified of changes to file metadata that need to be reflected in its display every few seconds.
– Shawn
Nov 28 '18 at 14:37
4
I think it takes 2 seconds until the Explorer view is updated, not until the attribute was set. Try a
GetFileAttributesafter the Set.– Paul Ogilvie
Nov 28 '18 at 14:37