|
Sorry I must be missing something . I do not see the connection between Cwnd::FromHandle and debugptr = (CprogDebug *)temptr->GetOwner();.
|
|
|
|
|
First let just say what I am trying to accomplish I have CProgDebug object of Cwnd type I am trying to save all the info in that Object I have two modal dialogboxes which gather info that I need so when I create these two Modal Dialog Boxes one after the other I create them with pParent being = to the Created Dialog the documentation says in that Case if pParent is not equal to NULL the pParent Cwnd will be the Parent or Owner maybe I should try debugptr = temptr->GetParent(); and see what Happens I think your logic is right though
Thanks
|
|
|
|
|
this is what documentation states Quote: Points to the parent or owner window object (of type CWnd
I just stepped thru my constructer of both modal dialog boxes in my quick watch I had this->m_WndOwner (from Cwnd) and this->m_pParent (from Cdialog) I had passed a valid Cwnd
after in Disassembly mode I executed Cdialog:Cdialog this->m_pParent is Null while this->m_pParent has a value in fact the pointer to the pParent I pass as I can see the eyecatcher
|
|
|
|
|
I have never used GetOwner, but there seem to be some caveats about its usage at CWnd::GetOwner[^]. You also need to be sure that temptr is pointing at the object you think it is.
|
|
|
|
|
Richard as you noted the assembly didn't match the source It lead me to insert #pragma optimize("",off) and #pragma optimize ('',on) around the function the call to __imp CWnd::FromHandle disappeard and debugptr had the right value
Thanks
|
|
|
|
|
Hi all of you. Is there any solution that my application (an SDI MFC app) to know the moment when an new process is loaded into memory ?
|
|
|
|
|
|
I have listed all processes from an PC, with CreateToolhelp32Snapshot, but I don't know after some while another new processes are loaded ...
|
|
|
|
|
|
I have a modeless dialog from which I display to two modal dialog boxes one after the other
I would like to save all the information I get from the two in the modeless dialog
So my plan was when creating the modal dialog box pass the Cwnd pointer using the this pointer
Well the first one seems to work by this I mean make breakpoint
abendialog = new RTMDialog(mylparam,this);
at the creation of the object and then at the contructor
RTMDialog::RTMDialog(LPARAM mylparam, CWnd* pParent)
: CDialog(IDD_DIALOG9, pParent)
at this pParent has valid pointer
In this dialog I create a second modal dialog
void RTMDialog::Percolate()
{
CMypercolate DOPREC(this);
DOPREC.DoModal();
}
here too the this pointer is valid however when I get to this constructer
pParent is null
CMypercolate::CMypercolate(CWnd* pParent )
: CDialog(IIDD_MYPERCOLATE, pParent)
{
|
|
|
|
|
Hardly surprising the question you need to ask yourself as a learning exercise
What is difference between instantiating an object using new vs. without
AKA there is a difference between these two things
abendialog = new RTMDialog(mylparam,this);
CMypercolate DOPREC(this);
The hint is where is the object put in the two different cases?
Hmmm your into your mutitasking so what is wrong with this which is the same thing
void SomeCreateCall (void){
char[256] data;
CreateThread(NULL, 0, SomeThreadFunction, (LPVOID)&data, 0, NULL);
}
The variable data above is obviously valid to pass so whats the problem and whats the fix?
In vino veritas
modified 23-Feb-18 2:52am.
|
|
|
|
|
The stack data or local data disappears once the functions exists
Thank so much
|
|
|
|
|
Correct pretty sure same thing is going to happen with your code, I wouldn't hold the dialog on the stack on a modeless dialog.
It's pretty dangerous to do, hold it as local data in the first dialog or on the heap same as you would on a multitask code 
In vino veritas
|
|
|
|
|
Hello,
I wanted to communicate from one app (exe) to another app (exe) so I implemented COM interface in first application.
There are only .idl and some auto generated files (xxx.h & xxx.c) in first app but I dont know how to use this interface in another application.
Please guide.
|
|
|
|
|
|
Thanks for link.
Actually I am aware about the usage of COM but now problem is something different.
How to use COM interface defined in my first application which is an executable. It does not produce any dll or lib.
I need to give some reference to my second application to access same COM interface.
|
|
|
|
|
If you read those articles they explain how to link a COM client to the server.
|
|
|
|
|
Thanks,
Actually I got it. In my case it is .tlb file which I need to use to instantiate interface.
Now one more problem came 
COCreateInstance() is returning REGDB_E_CLASSNOTREG Class not registered.
Do I need to register tlb file like a com dll?
If yes then how can do so?
|
|
|
|
|
Fedrer wrote: Do I need to register tlb file like a com dll?
You cannot register a TLB file.
However you have to register the COM component (that is the DLL).
|
|
|
|
|
I am working with an ARM microcontroller and I'm programming in normal C programming language. I have a big array of struct, but a lot of the struct elements are unused and I would like to turn the array into an optimized struct/linked list instead. What would CLEAVER_MACRO_OR_PERHAPS_FUNCTION be in this case?
struct mySmallStruct1_s {
void* ptrToNextElement;
int myArray[1];
};
struct mySmallStruct2_s {
void* ptrToNextElement;
int myArray[2];
};
struct mySmallStruct3_s {
void* ptrToNextElement;
int myArray[3];
};
struct myBigStruct_s {
struct mySmallStruct1_s mySmallStruct1;
struct mySmallStruct2_s mySmallStruct2;
struct mySmallStruct3_s mySmallStruct3;
};
// This compiles fine, but I want something more reader-friendly
struct myBigStruct_s myBigStruct = {
{(void*)&myBigStruct.mySmallStruct2, {0}},
{(void*)&myBigStruct.mySmallStruct3, {0, 0}},
{(void*)0, {0, 0, 0}}
};
// What should CLEAVER_MACRO_OR_PERHAPS_FUNCTION be to make this compile?
struct myBigStruct_s myBigStruct2 = {
{CLEAVER_MACRO_OR_PERHAPS_FUNCTION(2), {0}},
{CLEAVER_MACRO_OR_PERHAPS_FUNCTION(3), {0, 0}},
{NULL, {0, 0, 0}}
};
|
|
|
|
|
Unionize the struct pointers .. they are all pointers to different types
typedef union {
void* void_ptr;
struct mySmallStruct1_s* SmallStruct1_ptr;
struct mySmallStruct2_s* SmallStruct2_ptr;
struct mySmallStruct3_s* SmallStruct3_ptr;
} smallstruct_ptr;
struct mySmallStruct1_s {
smallstruct_ptr ptrToNextElement;
int myArray[1];
};
struct mySmallStruct2_s {
smallstruct_ptr ptrToNextElement;
int myArray[2];
};
struct mySmallStruct3_s {
smallstruct_ptr ptrToNextElement;
int myArray[3];
};
struct myBigStruct_s {
struct mySmallStruct1_s mySmallStruct1;
struct mySmallStruct2_s mySmallStruct2;
struct mySmallStruct3_s mySmallStruct3;
};
struct myBigStruct_s myBigStruct = {
{ .ptrToNextElement.SmallStruct2_ptr = &myBigStruct.mySmallStruct2, .myArray[0] = 0 },
{ .ptrToNextElement.SmallStruct3_ptr = &myBigStruct.mySmallStruct3, .myArray[0] = 0, .myArray[1] = 0 },
{ .ptrToNextElement.void_ptr = 0,.myArray[0] = 0,.myArray[1] = 0, .myArray[2] = 0 }
};
struct myBigStruct_s myBigStruct1 = {
{ .ptrToNextElement.SmallStruct2_ptr = &myBigStruct1.mySmallStruct2,.myArray[0] = 1 },
{ .ptrToNextElement.SmallStruct3_ptr = &myBigStruct1.mySmallStruct3,.myArray[0] = 1,.myArray[1] = 2 },
{ .ptrToNextElement.void_ptr = 0, .myArray[0] = 1,.myArray[1] = 2,.myArray[2] = 3 }
};
In vino veritas
|
|
|
|
|
I have a problem with redirect console app output and input. The problem is that any example I found does not work for me. I want to develop WPF GUI for a console app. This is the example code to redirect output:
ProcessStartInfo start = new ProcessStartInfo();<br />
start.FileName = "C:\\myapp.exe";
start.UseShellExecute = false;<br />
start.RedirectStandardOutput = true;<br />
using (Process process = Process.Start(start))<br />
{<br />
using (StreamReader reader = process.StandardOutput)<br />
{<br />
string result = reader.ReadToEnd();<br />
Console.Write(result);<br />
}<br />
}
So I did some reverse engineering on the console app and I found that this app is compiled using Microsoft Visual C 6.0. The app uses WriteFile to output to the console and first argument passed to the function equals 7.
I wrote the example code:
#include "stdafx.h"<br />
#include <windows.h><br />
<br />
int main()<br />
{<br />
AllocConsole();<br />
HANDLE hStdout;<br />
HANDLE hStdout2 = (HANDLE)0x00000007;<br />
char s[] = "Hello world !\r\n";<br />
char s2[] = "Hello world !CONOUT\r\n";<br />
char s3[] = "test\r\n";<br />
DWORD dwBytesWritten;<br />
<br />
HANDLE hScreenBuffer = CreateFileA("CONOUT$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);<br />
<br />
hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
WriteFile(hStdout2, s3, (DWORD)strlen(s3), &dwBytesWritten, NULL);
WriteFile((HANDLE)0x00000007, s3, (DWORD)strlen(s3), &dwBytesWritten, NULL);
WriteFile(hStdout, s, (DWORD)strlen(s), &dwBytesWritten, NULL);
WriteFile(hScreenBuffer, s2, (DWORD)strlen(s2), &dwBytesWritten, NULL);
<br />
FreeConsole();<br />
<br />
return 0;<br />
}
I do not understand why this: WriteFile(hStdout, s, (DWORD)strlen(s), &dwBytesWritten, NULL); (hStdout equals 7 checked by debuger) is redirected using my above example code or TestCON.exe > test.txt but this WriteFile((HANDLE)0x00000007, s3, (DWORD)strlen(s3), &dwBytesWritten, NULL); is printed always on the console.
Any suggestions how can I redirect any output to my GUI app?
|
|
|
|
|
It's in just about every AllocConsole example on the net
AllocConsole();
freopen("CONIN$", "r", stdin);
freopen("CONOUT$", "w", stdout);
freopen("CONOUT$", "w", stderr);
setbuf(stdout, NULL);
You may want to use the new freopen_s etc calls to avoid the warning.
CONIN$ and CONOUT$ are the console input and outputs associated to your program as distinct from the standard handles.
You may also care to read about console handles versus standard handles
Console Handles - Windows Console | Microsoft Docs[^]
That will give you the more modern way to do it via SetStdHandle and you should understand it now.
In vino veritas
modified 19-Feb-18 2:19am.
|
|
|
|
|
The problem is that I have only binary version console app that writes directly to the console.
Can you show me more completed code because maybe I miss something?
|
|
|
|
|
That isn't a problem you have redirected the standard file handle to the windows console created.
Try to read the console handles document and understand what is happening.
Visual studio does exactly that it executes a windows binary file and redirects the output to the console plane that is in visual studio.
Your binary file will use standard input/output and it's been redirected up to your console window.
You can also directly redirect spawned child applications
Creating a Child Process with Redirected Input and Output (Windows)[^]
That is if you want to do something like shellexecute a program and grab the output.
In vino veritas
modified 19-Feb-18 3:24am.
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
