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Correct, but assume that the controls on the dialog are dynamically created such that at time of coding i dont know as to what are the controls on the dialog. So i cannot provide the macro ON_BN_CLIKCED(btnid, handler).
The reason i want to over ride the pretranslatemessage is to catch what ever goes thru the message loop filter the messages i am intersted in by using and ifelse construct like you mentioned. But the main question is my handler in pretranslate never gets invoked Why???
Cmydialog::PreTranslateMessage(MSG *msg)
{
if( pMsg->message == WM_COMMAND )
{
if(LOWORD(pMsg->wParam)==IDC_CTRL_ID && HIWORD(pMsg->wParam)==BN_CLICKED)
{
UINT controlID = LOWORD(pMsg->wParam);
if (controlID == someidofinterest)
{
//do what i want it to do
}
}
}
}
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Overriding OnCommand is the correct place to do this.
Why isn't PreTranslateMessage being called?
I had to think about this for a bit and reach back into the message loop days. PreTranslateMessage is not called for every type of message sent to a window. It is primarily a pre-cursor beforing calling the API function TranslateMessage.
TranslatesMessage's primary function is to convert key strokes into WM_CHAR messages or into command accelerators.
MFC's message loop, in a nutshell, looks like this:
while( GetMessage(pMsg) )
{
if( ! AfxPreTranslateMessage(pMsg) )
{
::TranslateMessage(pMsg);
::DispatchMessage(pMsg);
}
}
The key thing to note here as the GetMessage does not return for every message received by the application. It only returns for WM_QUIT, posted messages (I think), and keyboard handling. WM_COMMAND messages are sent directly to the window procedure from within GetMessage. The reason for this is that there is no translation necessary.
Think of it this way. The purpose of PreTranslateMessage/TranslateMessage is not to perform some action when a message is received. That's what the appropriate message handlers are for (like OnCommand). It's job is to convert message IDs from one to another as needed. For example if you press "Ctrl+N" it converts the WM_KEYUP to WM_COMMAND (ID_FILE_NEW).
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thanks a lot.
Your explanation solved it all. Is this behaviour of getMessage and pretranslate/translate message documented somewhere in msdn so that i could dig more into it.
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It probably is somewhere, but I couldn't say where. I discovered that partly through trial and error and partly gleaned from the many varying documents in MSDN. If you look at the docs for the GetMessage function there's a sentence that says:
"During this call, the system delivers pending messages that were sent to windows owned by the calling thread using the SendMessage, SendMessageCallback, SendMessageTimeout, or SendNotifyMessage function".
The key phrase being During this call. That's the only one I can think of off the top of my head.
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Anyone has an ideea about opening a file from command-line in a dialog-based application ?
A link to a article or something whould be great. thanks.
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If you want to run some DOS commands (also including opening a file) ShellExecute[^] is the way to go!
A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.
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Regardless of the type of application (dialog, SDI, or MDI), you simply need to look at the m_lpCmdLine member variable of CWinApp.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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DavidCrow, if you could extend the explications a liitle bit more, i would be gratefull. (something about WinMain call ?)
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I'm not sure what you mean by "extend the explications," but maybe this will help.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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Hi all,
I’m writing my first DLL. Any help would be greatly appreciated. When I run the DLL function fnCopyFile I get an error: "Unhandled exception at 0x77f5a58 in MyTest.exe." The DLL function works but this error occurs when popping out of the DLL’s fnCopyFile function.
Here is my DLL code:
Main program:
#include <string>
using namespace std;
typedef void (WINAPI *FncArcNewFile)(string str1, short si, string str2, short st);
int _tmain(int argc, _TCHAR* argv[])
{
HINSTANCE hinstLib;
FncArcNewFile FncCopy;
short iii = 4;
hinstLib = LoadLibrary(TEXT("C:\\ProgramFiles\\CasArc.dll"));
FncCopy = (FncArcNewFile)GetProcAddress((HMODULE)hinstLib, "fnCopyFile"); //Name of the function in the DLL.
FncCopy(string("c:"), iii, string("C:\\Custodian Working Dir \\0001_0001_0001_0002.txt"), iii);
FreeLibrary(hinstLib);
}
CasArc.dll program:
.H file
#include <string>
#include "CasArc.h"
#include <iostream>
using namespace std;
extern "C" __declspec(dllexport) void fnCopyFile(string pstrDir, short EVarIn_y, string pstrFile, short EVarIn_l);
.CPP file:
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
break;
}
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
extern "C" __declspec(dllexport) void fnCopyFile(string pstrDir, short EVarIn_y, string pstrFile, short EVarIn_l)
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;
DWORD dwAttrs;
//*ret_indicator = 0;
hFind = FindFirstFile(pstrFile.c_str(), &FindFileData);
if (hFind != INVALID_HANDLE_VALUE)
{
pstrDir += "\\";
pstrDir += FindFileData.cFileName;
if (CopyFile(pstrFile.c_str(), pstrDir.c_str(), FALSE))
{
dwAttrs = GetFileAttributes(FindFileData.cFileName);
//if ( GetLastError() != 0 )
// ErrorMessage();
if (!(dwAttrs & FILE_ATTRIBUTE_READONLY))
{
SetFileAttributes(pstrDir.c_str(), dwAttrs | FILE_ATTRIBUTE_READONLY);
}
}
else
{
ErrorMessage();
}
}
else
{
ErrorMessage();
}
FindClose(hFind);
}
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Hi,
I would like to know that how can i detect memory leaks in an application with information such as which file had memory leak and line number.
I have a dll which i dynamically load. That dll is using a big static library OpenSSL and i have included the DLL in the exe based project.
Now what i find through standard outputwindow after closing of application is that there are huge memory leaks like,
{18643} normal block at 0x012F8AE0, 12 bytes long.
Data: < / C IT> 20 8B 2F 01 00 00 00 00 43 E6 49 54
I want to know the exact file and line number which comes through DEBUG_NEW i think, but the library code is ansi c code and it 500 or more file so any ideas how can i debug to the exact location.
Any good memory profiler available.
Thank You.
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Is there in this library a common header file that is always included?
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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I am wondering how can I create a simple function that will return the current second,minutes and hour in a 3 dimensional int array. I been looking at the information on ctime in windows to see how I could do this but I havent found what I needed. I dont want the function to pause or anything I just want it to simply return the second, minutes and hours.
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Check GetSystemTime
or time_t time( time_t *timer );
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Supaflyfrank wrote:
...return the current second,minutes and hour in a 3 dimensional int array.
What is this? A 3D int array looks like:
int arr[x][y][z]; How do you propose to fill that up with "second, minutes and hour?"
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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int arr[1][1][1];
perhaps...
But I can't help to think that a better way to store time is in a structure like this:
<br />
struct TIME<br />
{<br />
int m_nSeconds;<br />
int m_nMinutes;<br />
int m_nHours;<br />
};<br />
There probably is a predefined structure like that.
A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.
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Bob Stanneveld wrote:
There probably is a predefined structure like that.
Several, actually.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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I will look in to see if their is any structure already made. But I was more thinking of a array like this: int Time[3]; Time[0] Would be hours Time[1] Would be minutes and Time[2] Would be seconds.
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Hi,
I am inserting a flash control in my application (Win32 API application no MFC) and now I have to implement GetMoniker of IOleObject... How can I do that?
Thank you very much in advance for your answers...
Well... I am a beginner ...
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Hello there,
I am trying to create a modeless dialog-box dynamically, without using a resource image file. The following code illustrates my (useless) effort so far:
BOOL CDlg::Setup()
{
DLGTEMPLATE DlgTemplate;
WORD MenuNull = NULL;
WORD ClassNull = NULL;
WORD TitleNull = NULL;
int nScrHeight;
int nScrWidth;
RECT rect;
nScrWidth = ::GetSystemMetrics(SM_CXSCREEN);
nScrHeight = ::GetSystemMetrics(SM_CYSCREEN);
DlgTemplate.cx = nScrWidth / 5;
DlgTemplate.cy = nScrHeight >> 2;
DlgTemplate.x = nScrWidth - DlgTemplate.cx;
DlgTemplate.y = 0;
DlgTemplate.cdit = 0;
DlgTemplate.style = WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_VISIBLE | DS_3DLOOK;
DlgTemplate.dwExtendedStyle = 0;
if(!CreateIndirect(&DlgTemplate))
return FALSE;
.
:
.
After calling CDialog::CreateIndirect, there is an error that occurs at WinAPI level -- Error 1813 -- The specified resource type cannot be found in the image file.
If you could please tell me what I am doing wrong here, I would greatly appreciate it!
Thank you so much,
David Nimrod
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CreateIndirect was not provided to allow dynamic creation of dialogs like you pretend, so its interface is evily complicated. If you go to the docs for DLGTEMPLATE[^], it is said that this structure must be followed in memory by a bunch of other binary information. As you haven't provided this, CreateIndirect dives into random memory hence the result.
So, you must construct a block of memory according to what CreateIndirect expects, possibly with the minimum information necessary. What has to be written is described here[^]. Good luck.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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I have created a pointer to a shared memory, but I need to be able to access variables (not bit fields - they will be done by word) via an offset from the start of the memory location. I have an array of all the offsets to each variable, but dont know how to setup a pointer to the memory area and how to obtain each variable's data using this offset.
The structure contains bit fields, which must remain so cant use the offsetof macro.
#pragma pack(1)<br />
typedef struct<br />
{<br />
unsigned short i; <br />
float f; <br />
char c; <br />
unsigned short bit41 : 4;<br />
unsigned short bit42 : 2;<br />
unsigned short bit43 : 1;<br />
char s;<br />
unsigned short x;<br />
double y;<br />
double z;<br />
} SFOO;<br />
<br />
struct TSharedMemory {<br />
union<br />
{<br />
SFOO fields;<br />
unsigned short buffer[32];<br />
}test_data;<br />
);<br />
#pragma pack()
Note I have used CreateFileMapping and
MapViewOfFile, which is OK for access via the structure, but its for access via the array of offsets that I cant seem to do.
i.e. setup pointer to start of the shared memory and access via this pointer and the offsets.
Any suggestions please.
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Whatever the way you get you offset, to access the correct member of the structure you should do:
void *pvIntrinsic pointer to your data
pvFieldPtr = ((char *) pvIntrinsic) + uOffset
Then do the correct cast on it
eg: for a double value
*(double *) pvFieldPtr = doubleValue;
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Thanks that was what I was looking for.
Just one final question regarding casting. Are they any way I can do a more generalised cast or must it be to the correct type.
Thanks again,
Sweep
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