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Thanks a lot, I got the idea.
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My source file is tif, grayscale, PixelFormat8bppIndexed.
I can't create Graphics object from image with such pixel
format. So I have to use PixelFormat32bppARGB for example.
Can I convert that image to image with 8 bpp indexed pixel
format before I save it in a file? I am concern about the
size of the output file.
Thanks!
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you can use this code (with some -fast- asm)
{
Bitmap* pDstBmp = Convert_Bmp32_Bmp8( pSrcBmp );
}
Bitmap* CMdiPrjDoc::Convert_Bmp32_Bmp8( Bitmap *mBmpSrc )
{
int x = mBmpSrc->GetWidth();
int y = mBmpSrc->GetHeight();
Bitmap* mBmpDest = new Bitmap(
x,
y,
PixelFormat8bppIndexed );
SetPaletteGrayScale(mBmpDest);
BitmapData bitmapData, tBitmapData;
Rect rect(0, 0, x, y);
BYTE *pixels;
DWORD *tPixels;
mBmpDest->LockBits(
&rect,
ImageLockModeWrite,
PixelFormat8bppIndexed,
&bitmapData);
mBmpSrc->LockBits(
&rect,
ImageLockModeRead,
PixelFormat32bppARGB,
&tBitmapData);
pixels = (BYTE*)bitmapData.Scan0;
tPixels = (DWORD*)tBitmapData.Scan0;
DWORD rD;
int iLineJmp, iTLineJmp;
for(UINT yi=0; yi<y; yi++)
="" {
="" ilinejmp="yi" *="" bitmapdata.stride;
="" itlinejmp="(yi" tbitmapdata.stride)="" 4;
="" for(uint="" xi="0;" xi<x;="" xi++)
="" rd="tPixels[" +="" xi];
="" __asm
="" xor="" ebx,="" ebx;
="" mov="" eax,="" rd;
="" bl,="" al;
="" shr="" ax,="" 8;
="" add="" bx,="" ax;
="" 16;
="" and="" 00ffh;
="" rd,="" }
="" pixels[="" xi]="(BYTE)(rD/3);
" mbmpsrc-="">UnlockBits(&tBitmapData);
mBmpDest->UnlockBits(&bitmapData);
return mBmpDest;
}
void SetPaletteGrayScale(Bitmap* pBmp)
{
if(!pBmp) return;
ColorPalette* cp = (ColorPalette*)malloc(sizeof(ColorPalette)+256*4);
cp->Flags = PaletteFlagsGrayScale;
cp->Count = 256;
DWORD argb;
BYTE b;
for(int i=0; i<256; i++)
{
b = i;
_asm
{
mov ah, 255
mov al, b
shl eax, 16
mov ah, b
mov al, b
mov argb, eax
}
cp->Entries[i] = argb;
}
pBmp->SetPalette(cp);
free (cp);
}
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I just started C++ not more than a few days ago, and I'm familiar with the input, output, and string functions. I want to learn how to work with the registry through a C++ application, and I've looked everywhere on the Internet for a simple explanation! -- But, no luck.  All I can find are these complicated guides that "assume" the reader already knows a ton about working with the registry in C++.
This is what I want to learn how to do:
1) Write a key (and it's value) to the registry
2) Read the value of a key in the registry
3) Change the value of a key in the registry
If any of you can please write a step-by-step [beginner's] guide to using the registry, or if you already know of one available on the Internet, your help would be GREATLY appreciated.
Thanks.
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One solution is via Win32 API. Here is a good referenc efor registry API.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/registry_functions.asp
Kuphryn
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(1)(3)RegSetValueEx
(2)RegQueryValueEx
see other functions in msdn:
RegCloseKey
RegConnectRegistry
RegCreateKey
RegCreateKeyEx
RegDeleteKey
RegDeleteValue
RegEnumKey
RegEnumKeyEx
RegEnumValue
RegFlushKey
RegGetKeySecurity
RegLoadKey
RegNotifyChangeKeyValue
RegOpenKey
RegOpenKeyEx
RegQueryInfoKey
RegQueryMultipleValues
RegQueryValue
RegQueryValueEx
RegReplaceKey
RegRestoreKey
RegSaveKey
RegSetKeySecurity
RegSetValue
RegSetValueEx
RegUnLoadKey
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I am working on a COM Object in a non MFC framewrok . I have a Multimedia timer to do the timing . I am unable to access(code crashes ) certain pointers when accessed from the TImer procedure.
Is there are conflict with the Threaded model of the TimerProc thread and is there any initialization that can be done ?
If no can I have something similar to Postmessage that will notfiy my main thread from the Timer proc so that I can carry on Business !!! . IF yes how will the syntax be ?
Please help !
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Yes, messages is one solution given that the process has a message loop.
Kuphryn
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Hello
CSocket of mfc70 and mfc71 works properly under Win98 and WinXP, but have a bug with CSocket::OnReceive() under Win2k.
is there any solution ?
thank you.
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what bug?
return value error?
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Hello
I tested some apps like CHATSRVR/CHATTER (vc++ sample) under win98, winxp and win2k (with mfc70 and mfc71).
on win2k CSocket::OnReceive() receives only 5 to 10 messages, then nothing will be captured.
but if we build the same apps with vc++ 6.0 (mfc42), it will be ok.
thank you.
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Oh, I am still working with VC++ 6.0 (mfc42) and cannot help you. And I have a problem, too. Could you do me a favor?
When I use winsock (CSockect e.g.) to recieve the message of websites by sending "Get ...", majority are no problem but others can't work. I opened these ones in IE, They displayed a Security Alert messagebox with "Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate."
Why I recieve nothing under this condition?
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I have tried using the select font dialog box to select a font for an edit control and it doesn't work. The edit control goes into the default font. Here's the code i used:
void CDocBar::InitFontDlg()
{
CFont myfont;
LOGFONT lf;
CFontDialog dlgChooseFont;
COLORREF g_rgbText = RGB(0, 0, 0);
CEdit *editControl;
//GetObject(myfont.Detach(), sizeof(LOGFONT), &lf);
dlgChooseFont.m_cf.lpLogFont = &lf;
dlgChooseFont.m_cf.rgbColors = g_rgbText;
if (dlgChooseFont.DoModal() == IDOK)
{
myfont.CreateFontIndirect(dlgChooseFont.m_cf.lpLogFont);
g_rgbText = dlgChooseFont.m_cf.rgbColors;
editControl = (CEdit *) GetDlgItem(IDD_EDIT1);
editControl->SetFont(&myfont, TRUE);
}
}
What could be wrong? I have little experience with fonts.
-- Steve
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It's a scope-problem - make myfont member of CDocBar and I'm pretty sure it'll work.
Regards,
Michael Mogensen, mm it-consult dk.
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Thanks! I hate when these kinds of problems are caused by such a small thing. It works great!
-- Steve
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I have built a program in using VC++ 6.0 that will parse out the URL's from an AOL .pfc(personal filling cabient) file. The .pfc is full of garbage(terminators, little boxes kinda looks like encryption, misc chars, and URL's) The program works just fine on most .pfc files. The problem Im having with some .pfc files are that the program will not read the entire file. I have reason to believe that my troubles lie in the eof(end of file) terminating condition. Here is the code that reads in the file char by char adding it to a string:
if(! inStream.eof()) {<br />
<br />
if(! iscntrl(cSymbol))<br />
m_strBeforeParse += (CString)cSymbol;<br />
<br />
inStream.get(cSymbol);<br />
}
For some reason the eof function is returning "true" when it reaches a certain part of the file. This certain part of the file is the little boxes in the file that I described earlier as what I thought looked like encyrption. If I erase these little boxes, I can read whole filwe just fine. If anyone has any ideas Id be greatful to hear them.
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how are you opening the file? What flags do you pass in to the file constructor/open code?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
Santa Cruz Networks
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I've had the same problem before (just dealt with it today in fact). The little boxes you see are non-printing ascii characters. When I ran into the problem, the char was decimal 26, hex 1A. You are reading a binary file as a text file, and that's why you are having a problem. If you read the file as binary, you won't have the EOF problem, you'll just have to change your code a little bit.
--Dean
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Thank's Dean
-Rocky
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Just wondering if someone can point to any tutorial onCallback Functions
with some good examples
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It is a mechanism by which you can call another static function by using its function pointer . Very useful when u do a layered class architecture . U could pass data from one class to another and provide filtering too.
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http://www.codeproject.com/cpp/callbacks.asp?target=callback%7Cmfc
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Dynamic dialog is a dialog of which controls
can be created or removed manually depends on the situation.
It is easy to make a dynamic modaless dialog as follows.
////////////////
CDialog *menu;
menu = new CDialog;
menu->Create(IDD_MY_BLANK_DIALOG, this);
// add a edit control if IsEdit is true
if(IsEdit) {
CEdit* pEdit = new CEdit();
RECT rctEdit = {5, 5, 100, 30};
pEdit->Create(WS_VISIBLE | WS_CHILD | WS_TABSTOP, rctEdit,
FromHandle(menu->m_hWnd), 1100);
}
// add a button control if IsBtn is true
if(IsBtn) {
CButton* pButton = new CButton();
RECT rctButton = {5, 35, 100, 60};
pButton->Create(_T("Button"), WS_VISIBLE | WS_CHILD | WS_TABSTOP, rctButton,
FromHandle(menu->m_hWnd), 1101);
}
menu->ShowWindow(SW_SHOW);
///////////////
But I want to make a dynamic modal dialog.
I heard about the InitModalIndirect function but it is somewhat complex to use.
I want a compact code.
Is there any simple method like an above code?
Thanks.
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well...
When you call the DoModal function you must have the dialog created, then just before to call DoModal, you can add all the controls you want...
Hope this helps...
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That's exactly what I want.
But the question is how to implement it?
I tried many ways, but I failed because of lack of knowledge about creating controls
in blank dialog.
Could you show me an example which is really working?
The important thing is that it should be a modal dialog.
Thanks.
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