This appeared in .120 and worked in previous versions

The size of the struct should be 5 but is returned as 8.
Changing the struct to  "align(1) struct foo" gives the correct answer.

This has implications when passing structures to the Windows api.
-------------------------------------

private import std.stdio;
struct foo
{
	uint cbSize;
	char j;
}

int main()
{
	uint k=foo.sizeof; // k should be 5 but foo.sizeof returns 8
	return 0;

}

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dickl schrieb am Fri, 08 Apr 2005 23:00:53 -0400:
> This appeared in .120 and worked in previous versions
>
> The size of the struct should be 5 but is returned as 8.
> Changing the struct to  "align(1) struct foo" gives the correct answer.
>
> This has implications when passing structures to the Windows api.
> -------------------------------------
>
> private import std.stdio;
> struct foo
> {
> 	uint cbSize;
> 	char j;
> }
>
> int main()
> {
> 	uint k=foo.sizeof; // k should be 5 but foo.sizeof returns 8
> 	return 0;
>
> }

Seems to be missing from the changelog - this was documented in the source code. I'm not sure that this solution to the GC problem is wise.

Thomas


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"dickl" <dick221z@yahoo.com> wrote in message news:d37gh6$v1i$1@digitaldaemon.com...
> This appeared in .120 and worked in previous versions
>
> The size of the struct should be 5 but is returned as 8.
> Changing the struct to  "align(1) struct foo" gives the correct answer.
>
> This has implications when passing structures to the Windows api.

D was changed to match C's behavior, which gives 8 as well:

#include <stdio.h>

struct foo
{
    unsigned cbSize;
    char j;
};

void main()
{
    printf("%d\n", sizeof(struct foo));    // prints 8
}

Walter wrote:
> "dickl" <dick221z@yahoo.com> wrote in message
> 
> D was changed to match C's behavior, which gives 8 as well:
> 

True.

C:\> cl program.c
C:\> program
8

and:

C:\> cl -Zp1 program.c
C:\> program
5

-Zp{n} should be available in D.
DMD has not enough switches...

Its fine as long as I know what it is doing and how to work around.

However, the code is from Microsoft DDK so the Microsoft compiler
is returning  5 rather than 8 and of course Windows was expecting 5.

Walter wrote:
> "dickl" <dick221z@yahoo.com> wrote in message
> news:d37gh6$v1i$1@digitaldaemon.com...
> 
>>This appeared in .120 and worked in previous versions
>>
>>The size of the struct should be 5 but is returned as 8.
>>Changing the struct to  "align(1) struct foo" gives the correct answer.
>>
>>This has implications when passing structures to the Windows api.
> 
> 
> D was changed to match C's behavior, which gives 8 as well:
> 
> #include <stdio.h>
> 
> struct foo
> {
>     unsigned cbSize;
>     char j;
> };
> 
> void main()
> {
>     printf("%d\n", sizeof(struct foo));    // prints 8
> }
> 
> 
> 

"dickl" <dick221z@yahoo.com> wrote in message news:d38rub$kvh$1@digitaldaemon.com...
> Its fine as long as I know what it is doing and how to work around.
>
> However, the code is from Microsoft DDK so the Microsoft compiler is returning  5 rather than 8 and of course Windows was expecting 5.

Check the DDK code - I bet there's a #pragma pack(1) around the struct
declaration, which works like D's align(1).