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I have a Windows Forms application that runs, when clicking on a button, a .exe console application. I know I can use System::Diagnostics::Process::Kill to exit it, and I want to do it when the user clicks on a Cancel button.
The problem I am encountering is that while the console application is running it is not possible to interact with the Windows Forms application.
Is there any way to run the process minimized or something similar?
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piul wrote: it is not possible to interact with the Windows Forms application.
It is, unless you made it impossible through some code.
Show us the relevant code that deals with launching the console app.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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There it goes:
proc= gcnew System::Diagnostics::Process;
proc->StartInfo->RedirectStandardOutput = true;
proc->StartInfo->UseShellExecute = false;
proc->StartInfo->FileName = "..\\..\\..\\Tests\\ConsoleTest\\debug\\ConsoleTest.exe";
proc->OutputDataReceived += gcnew System::Diagnostics::
DataReceivedEventHandler (&Form1::StdoutHandler);
bool processStarted = false;
try
{
processStarted = proc->Start();
}
catch (Exception^ excp)
{
richTextBoxOutput->AppendText(excp->Message);
}
if (processStarted)
{
buttonCancel->Enabled = true;
proc->BeginOutputReadLine();
proc->WaitForExit();
buttonCancel->Enabled = false;
}
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piul wrote: proc->WaitForExit();
this is a blocking call: the method waits, i.e. does not return, until the target process has exited. So if all the code shown is running on the main thread (say is part of an event handler, maybe a button click handler), then the main thread will sit there waiting , rather than handling all your Windows events (such as you clicking on the cancel button).
There are a couple of ways to solve your problem, the one I prefer is using an extra thread, probably a BackgroundWorker. Its DoWork handler would contain
proc->BeginOutputReadLine();
proc->WaitForExit();
or even a synchronous loop to read the output, no need to use asynchronous when you already have a dedicated thread.
BTW: you can't directly touch GUI Controls from inside DoWork, so you should enable the cancel button before you launch the BGW, and disable it inside the RunWorkerCompleted handler.
One alternative would be to use a timer (a System.Windows.Forms.Timer at best), that ticks say every 300 msec. Its Tick handler could check (no wait!) whether the process has exited, and if it has, disable the cancel button and stop itself.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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why should one needs to do this, I believe first line is enought. What makes the difference...
CString strCode(OtherString);
int i = 0;
while(str.GetAt(i) != '\0')
{
i++;
}
str = str.Left(i);
Thanks
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I guess someone does not trust the CString constructor.
I must get a clever new signature for 2011.
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Although not advisable a CString can contain embedded nulls.
So if one wants a string that doesn't have nulls, probably specifically in terms of length, and one isn't sure that nulls are not present (or one is sure) then one would need to do something like that.
Search for "embedded null" in the following.
http://msdn.microsoft.com/en-us/library/cws1zdt8.aspx[^]
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I am new to windbg and I am analysing crash dump at some point I got below table as out put of !heap -s command, I want to dig deep and analyse futther can you please advice.
0:000> !heap -s
LFH Key : 0xeaafe2e0
Heap Flags Reserv Commit Virt Free List UCR Virt Lock Fast
(k) (k) (k) (k) length blocks cont. heap
-----------------------------------------------------------------------------
00150000 00000002 4096 3276 3292 183 37 5 0 0 L
00250000 00001002 64 56 56 2 1 1 0 0 L
00260000 00008000 64 12 12 10 1 1 0 0
00340000 00001002 64 28 28 3 1 1 0 0 L
00360000 00041002 1280 168 208 96 22 7 0 0 L
008b0000 00001002 1088 72 72 14 3 1 0 0 L
008d0000 00001002 64 28 28 2 1 1 0 0 L
00c80000 00001002 15424 5700 9744 323 41 53 0 6 L
03400000 00001002 64 24 24 3 1 1 0 0 L
0ff90000 00041002 1280 308 308 2 1 1 0 0 L
03520000 00001002 3136 612 688 577 6 4 0 0 L
0fff0000 00001002 64 32 32 2 1 1 0 0 L
121e0000 00001002 64 24 24 4 1 1 0 0 L
18fe0000 00001002 64 16 16 0 0 1 0 0 L
1a130000 00001002 64 16 16 3 1 1 0 0 L
1d9a0000 00001002 1024 1024 1024 1016 2 0 0 0 L
1dc30000 00001002 256 32 32 3 1 1 0 0 L
1f540000 00001002 256 12 12 1 1 1 0 0 L
1c090000 00001002 64 12 12 4 1 1 0 0 L
-----------------------------------------------------------------------------
modified on Tuesday, January 25, 2011 6:17 AM
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Hello,
I am having trouble finding anything
about displaying a bitmap image within an activex
webpage.
Can anybody direct me to something useful ?
Thanks v much
Simon
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Are you sure you are on the right forum?
Best wishes,
Navaneeth
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Anyone had any experience adding GPS support to a managed C++ application?
I will be checking out the articles in the next couple of days but I would also like to here some experiences of what is possible and the extent of any difficulties. e.g. are GPS aware laptops becomming more common or does your typical laptop still need a connection to a GPS device or smart phone?
Ger
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Ger Hayden wrote: are GPS aware laptops becomming more common
Even if it were true I would doubt there would be any way to validate it.
And without some qualification (probably severe) to restrict to a targeted market I would seriously doubt it.
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Hi, I've been banging my head against the wall for a few days with this one, so if anyone has a solution, you would be my hero. What I'm looking for is a way that when a Form is FIRST created and shown, it is already in the minimized state. I'm already aware of putting an icon in the tray, but that doesn't work the way I need it to, it must start already minimized in the taskbar. I also cannot have it show up for a quick second and then minimize, which is the only thing I can seem to get it too do. I don't want to go into all the specifics as why my program needs to do this, just trust me, it does. Any help would be greatly appreciated! Thanks!
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Set WindowState = Minimized in your form's properties.
I must get a clever new signature for 2011.
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I cannot get the syntax for the cyclic list class I am working on.
In the following class you see that I have a property named CycItem.
This works, but I would like to have it be the default indexer so I can just use Item or [].
Any help would be great.
#pragma once
using namespace System;
using namespace System::Collections::Generic;
using namespace System::Reflection;
namespace MG_Geo {
generic <typename T>
public ref class CycList: public List<T>
{
public:
CycList()
{
}
property T CycItem [int]
{
T get(int index) {
if (this->Count==0)
{
throw gcnew IndexOutOfRangeException("IndexOutOfRange Count = 0");
}
while (index < 0)
{
index = (this->Count + index);
}
if (index >= this->Count)
{
index = (index % this->Count);
}
return this[index];
}
void set(int index, T value) {
if (this->Count==0)
{
throw gcnew IndexOutOfRangeException("IndexOutOfRange Count = 0");
}
while (index < 0)
{
index = (this->Count + index);
}
if (index >= this->Count)
{
index = (index % this->Count);
}
this[index] = *value;
}
}
};
}
modified on Friday, January 7, 2011 6:22 AM
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Base class List(T) already has a default indexed property. You need to define your own on your class and mark it as new.
property T default [int]
{
virtual T get(int index) new
{
}
virtual void set(int index, T value) new
{
}
}
Best wishes,
Navaneeth
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posting the same question multiple times is against the site's rules, and will keep people from answering at all.
Did you read the forum guidelines?
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Need to pass private member of a Class as a argument to function of another class and get modified there and Class A will again user the modifed value of x there after..
int .Net Managed C++
class A
{
private :
int ^x;
...
B ^ ojbB;
ojbB->TheFunctionneedsPrivateObjectof_A( int &x)
}
class B
{
public TheFunctionneedsPrivateObjectof_A(int ^x)
{
Modify x here
}
}
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You could declare a property p_x in class A. Class B would then use p_x to get the value of x,then it can operate on the value at will, and finally use p_x place the result back into x for class A to carry on with.
Ger
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If x is already a reference to an object (why int ^ ?) then all you should need is:
ojbB->TheFunctionneedsPrivateObjectof_A(x);
which will pass x as a reference to the object, thus allowing the called function to access its member variables.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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Hmm. That would cause an unnecessary strong dependency. And the member was private.
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He/she asked how to do it, not whether it was a good thing. 
Just say 'NO' to evaluated arguments for diadic functions! Ash
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Hm, it depends on what are you are trying to accomplish. I assume you are dealing with CLR types in your example. In this case you are missing the ref keyword. If A and B are meant to be native C++ classes the code as you have posted it is wrong and would never compile since you cannot hold a handle to a managed type in an instance of a native class without resorting to gcroot. That said, technically, you can of course pass a handle or tracking reference to a CLR object like this:
public ref class A {
YourComplexObject^ mHandleToYourComplexObject;
B^ mHandleToB;
public void PassYourComplexObject() {
mHandleToB->TakeComplexObject(mHandleToYourComplexObject);
}
};
public ref class B {
public void TakeComplexObject(YourComplexObject^ pHandleToYourComplexObject) {
}
};
EDIT: Corrected PassYourComplexObject
modified on Friday, January 7, 2011 6:13 AM
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with the example below you should be set
Also works for other ref classes not only for primitves as int.
ref class A
{
private :
int x;
...
void foo()
{
B ^ ojbB;
x = 1;
ojbB->Increment(x);
}
}
ref class B
{
public:
void Increment(int %x)
{
x++;
}
}
Hope, I could help...
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