Re: access violation With dll?
On Thursday, 16 July 2015 at 17:22:50 UTC, jklp wrote:
On Thursday, 16 July 2015 at 17:04:09 UTC, Taylor Hillegeist
wrote:
[...]
Your proto is wrong. Your forgot the FFI convention (__cdecl =
extern(C)).
Try this instead:
---
extern(C)
alias Proto = void function(char*, int);
Proto func = cast(Proto) GetProcAddress(h, Test);
if (func)
{
char[] STUFF;
STUFF.length = 5000;
func (STUFF.ptr , STUFF.length);
// prints etc...
}
Also i guess that the dll returns a null terminated string so the
result has to be
read like this:
---
import std.string;
printf(%s\n, fromStringz(STUFF.ptr));
---
Otherwise you'll get a random output after the 'HELLO WORLD'.
(wait maybe the console will automatically cut... ?)
Re: access violation With dll?
On Thursday, 16 July 2015 at 17:04:09 UTC, Taylor Hillegeist
wrote:
Beleive it or not the code below does work. However I get an
access violation after every run? any Ideas why?
+Code to Run DLL
function+++
import core.runtime;
import std.stdio;
import core.memory;
import std.c.windows.windows;
int main()
{
HMODULE h;
FARPROC fp;
printf(Start Dynamic Link...\n);
h = cast(HMODULE) Runtime.loadLibrary(SharedLib.dll);
void function(ref char[], int) Testf
= cast(void function(ref char[], int))
GetProcAddress(h, Test); //Function Says HELLO WORLD
char[] STUFF;
STUFF.length = 5000;
Testf( STUFF , STUFF.length);
printf(%s\n, (STUFF)); //PRINTS HELLO WORLD
Runtime.unloadLibrary(h);
printf(End...\n);
return 0;
}
++END
CODE+++
the function header has this line:
void __cdecl Test(char MyOutput[], int32_t len);
and i get this Error:
object.Error@(0): Access Violation
0x77206568
0x646C726F
0x00405A2C in int object.ModuleInfo.opApply(scope int
delegate(object.ModuleInfo*))
0x0040222C in main
0x00414949 in mainCRTStartup
0x7678337A in BaseThreadInitThunk
0x770592E2 in RtlInitializeExceptionChain
0x770592B5 in RtlInitializeExceptionChain
To be honest I was surprised this worked, since i am fairly
unfamiliar to linking to dlls.
Your proto is wrong. Your forgot the FFI convention (__cdecl =
extern(C)).
Try this instead:
---
extern(C)
alias Proto = void function(char*, int);
Proto func = cast(Proto) GetProcAddress(h, Test);
if (func)
{
char[] STUFF;
STUFF.length = 5000;
func (STUFF.ptr , STUFF.length);
// prints etc...
}
Re: Defining constant values in struct
On Tuesday, 16 June 2015 at 21:17:37 UTC, tcak wrote:
As far as I known, when I define a string with enum and it is
used at different parts of code, that string is repeated again
and again in executable file instead of passing a pointer to
string. So, using enum with string doesn't seem like a good
idea.
Hence, I defined string as const to make it belong to struct
itself instead of instances, but it comes with 'need `this` for
...' error. This indicates that the string doesn't belong to
struct itself actually.
Because there is nothing like namespace in D, I used a
sub-struct.
[code]
struct TableSchema{
const string TABLE = users;
struct FieldTypes{
const string ID = BIGINT;
}
const string CREATESQL = ... id ~ FieldTypes.ID ~ ...;
}
[/code]
But compiler doesn't allow me to access FieldTypes.ID. It says
that it needs `this`. I tried with `static shared`, used
`class` instead of `struct` etc. But couldn't have come up with
a nice solution.
Do i miss a detail in your requirement ?
---
struct TableSchema{
const string TABLE = users;
struct FieldTypes{
static const string ID = BIGINT;
}
const string CREATESQL = ... id ~ FieldTypes.ID ~ ...;
}
---
because this works.
Re: Writeln does not prints if array has more than 500 elements
On Wednesday, 10 June 2015 at 21:49:56 UTC, kerdemdemir wrote: == NOTHİNG PRINTS What am I doing wrong? Which OS, which terminal ?
Re: problem with gc?
On Wednesday, 27 May 2015 at 05:48:13 UTC, zhmt wrote:
I am writing a echoclient, as below:
Ptr!Conn conn = connect(127.0.0.1,8881);
ubyte[100] buf;
for(int i=0; iN; i++)
{
scope string str = format(%s,i);
conn.write((cast(ubyte*)str.ptr)[0..str.length]);
conn.read(buf[0..str.length]);
n++;
}
conn.close();
When it loops about more than 10 times,the throughput will
fall from 6request/second to 26request/second.
If the code changes a little as below:
scope string str = format(%s,1); //changes to a constant
It will runs normally with speed of 6request/second. I test
for 13minutes, everything seems well.
What happened when the code changes a little? Who will give an
explaination,Thanks a lot?
Have you tried to declare str in the upper scope ?
---
Ptr!Conn conn = connect(127.0.0.1,8881);
ubyte[100] buf;
string str;
for(int i=0; iN; i++)
{
str = format(%s,i);
conn.write(cast(ubyte[]) str);
conn.read(buf[0..str.length]);
n++;
}
conn.close();
---
And also you could try to surround the whole block with
`GC.disable` and `GC.enable`. This would help to determine if the
GC is involved:
---
Ptr!Conn conn = connect(127.0.0.1,8881);
GC.disable;
ubyte[100] buf;
string str;
for(int i=0; iN; i++)
{
str = format(%s,i);
conn.write(cast(ubyte[]) str);
conn.read(buf[0..str.length]);
n++;
}
GC.enable;
conn.close();
---
Re: Template type deduction and specialization
On Wednesday, 20 May 2015 at 06:31:13 UTC, Mike Parker wrote:
I don't understand why this behaves as it does. Given the
following two templates:
```
void printVal(T)(T t) {
writeln(t);
}
void printVal(T : T*)(T* t) {
writeln(*t);
}
```
I find that I actually have to explicitly instantiate the
template with a pointer type to get the specialization.
```
void main() {
int x = 100;
printVal(x);
int* px = x;
printVal(px);// prints the address
printVal!(int*)(px) // prints 100
}
```
Intuitively, I would expect the specialization to be deduced
without explicit instantiation. Assuming this isn't a bug (I've
been unable to turn up anything in Bugzilla), could someone in
the know explain the rationale behind this?
---
import std.stdio;
void printVal(T)(T t) {
writeln(t);
}
void printVal(T: T)(T* t) {
writeln(*t);
}
void main() {
int x = 100;
printVal(x);
int* px = x;
printVal(px);
}
---
here it's selected correctly without explicit instantiation. But
honestly i don't know why since the asterisk is removed from the
T it looks quite incorrect.
Re: Why is one d file compiled into two files object file executable.
On Wednesday, 11 February 2015 at 05:08:16 UTC, Venkat Akkineni wrote: Hi I am coming from Java. What is the purpose of an object file why is it generated at compile time in addition to an executable. I know C generates an object file too, but I don't know what the use is. Please point me to any detailed documentation u may have regarding object files. Also does D have any facilities for dynamic code generation compilation ? Thankyou Sincerely Venkat It's not D-specific, every compiler for a compiled language produces objects: http://en.wikipedia.org/wiki/Object_file
Re: getting all children classes in program
Off Topic ! But in the same way:
---
static string[] IDs;
ptrdiff_t getClassID(ClassType, ClassBase)()
if ((is(ClassType == class)) (is(ClassBase == class)))
{
import std.algorithm;
if (!is(ClassType : ClassBase))
return -1;
else {
auto classTypeString = ClassType.stringof;
ptrdiff_t result = countUntil(IDs, classTypeString);
if (result == -1) {
IDs ~= classTypeString;
result = IDs.length -1;
}
return result;
}
}
void main(string[] args)
{
class Oops {}
class A : Oops{}
class B : Oops{}
class C : Oops{}
class D : Oops{}
class E {}
assert(getClassID!(A,Oops) == 0);
assert(getClassID!(B,Oops) == 1);
assert(getClassID!(C,Oops) == 2);
assert(getClassID!(D,Oops) == 3);
assert(getClassID!(C,Oops) == 2);
assert(getClassID!(B,Oops) == 1);
assert(getClassID!(A,Oops) == 0);
assert(getClassID!(E,Oops) == -1);
}
---
Re: Idea/request: If you have a DUB project, add a code.dlang.org badge to README
On Tuesday, 30 December 2014 at 21:12:38 UTC, Kiith-Sa wrote: A few weeks/months ago someone here mentioned that it'd be good if DUB projects linked to code.dlang.org to help anyone who runs into such a project quickly discover other D projects. MAny GitHub projects have badges/shields on top of their READMEs - little image strips showing things like continuous integration status, code coverage, etc. There's also a service generating these: shields.io I generated a simple listed at| code.dlang.org shield, and added it to my project READMEs as a link pointing to code.dlang.org for example, see D:YAML README: https://github.com/kiith-sa/D-YAML You can do the same by either linking to or downloading the shield: https://img.shields.io/badge/listed%20at-code.dlang.org-red.png (used red... because mars) and putting the image (whether as a link to shields.io or your own copy) into your README. It's not likely to be a huge improvement, but I expect it *can* help people notice more D projects and it's trivial to do. red is connoted negative/agressive, I think blue would be better. Or maybe yellow-mustard for those who have doubtful tastes...
Re: Idea/request: If you have a DUB project, add a code.dlang.org badge to README
On Tuesday, 30 December 2014 at 21:23:53 UTC, Kiith-Sa wrote: On Tuesday, 30 December 2014 at 21:19:52 UTC, jklp wrote: On Tuesday, 30 December 2014 at 21:12:38 UTC, Kiith-Sa wrote: A few weeks/months ago someone here mentioned that it'd be good if DUB projects linked to code.dlang.org to help anyone who runs into such a project quickly discover other D projects. MAny GitHub projects have badges/shields on top of their READMEs - little image strips showing things like continuous integration status, code coverage, etc. There's also a service generating these: shields.io I generated a simple listed at| code.dlang.org shield, and added it to my project READMEs as a link pointing to code.dlang.org for example, see D:YAML README: https://github.com/kiith-sa/D-YAML You can do the same by either linking to or downloading the shield: https://img.shields.io/badge/listed%20at-code.dlang.org-red.png (used red... because mars) and putting the image (whether as a link to shields.io or your own copy) into your README. It's not likely to be a huge improvement, but I expect it *can* help people notice more D projects and it's trivial to do. red is connoted negative/agressive, I think blue would be better. Or maybe yellow-mustard for those who have doubtful tastes... If you want blue, just replace red with blue. I used red because it's the color of the D logo, site and the color of Mars (as D was originally called Mars and lot of D things are named after Mars, e.g. Phobos/Deimos etc.) Sorry it was a trivial and useless answer. forgot that this board is excusively serious.
