C / C++ / MFC

30-Nov-07 4:40

hello , i've tryed to capture snapshots on yahoo webcam with bitblt to make a yahoo webcam recorder, i managed to do it but with some problems. on my webcam it works perfectly the image captured is clear but if i try to snapshot another webcam window(some work some don't) the image is scrambled. i will post the entire source code it's not too long and a sample snapshot to see the problem.

http://rapidshare.com/files/73346892/frame_2.bmp.html

<br />
   HWND frame,mainwin,last=NULL;<br />
<br />
<br />
bool writebmpfile(int bitmap_dx,int bitmap_dy,int bytes, BYTE *memory,BITMAPFILEHEADER fileHeader,BITMAPINFOHEADER infoHeader,int frame);<br />
<br />
<br />
typedef struct cadre<br />
{<br />
    char cadru[200];<br />
}cadre;<br />
<br />
<br />
cadre cadre[10000];<br />
<br />
<br />
<br />
BOOL CALLBACK findchildweb(HWND hwnd,LPARAM lParam)<br />
{<br />
    char clasa[100]={0};<br />
    char text[150]={0};<br />
<br />
<br />
    GetClassName(hwnd,clasa,100);<br />
<br />
    if(!strcmp(clasa,"ATL:0B39D378")|| !strcmp(clasa,"#32770"))<br />
    {    <br />
        frame=hwnd;<br />
<br />
    <br />
    }<br />
<br />
    GetWindowText(hwnd,text,150);<br />
<br />
    if(strstr(text,"Last")!=NULL || strstr(text,"Broadcast")!=NULL)<br />
    {<br />
        last=hwnd;<br />
<br />
    }<br />
<br />
<br />
<br />
    <br />
    if(last!=NULL && frame!=NULL)<br />
        return false;<br />
    else<br />
        return true;<br />
<br />
}<br />
<br />
<br />
<br />
//----------------------------------------------------------<br />
BOOL CALLBACK findwebwnd(HWND hwnd,LPARAM lParam)<br />
{<br />
    char clasa[100]={0};<br />
<br />
    GetClassName(hwnd,clasa,100);<br />
<br />
    if(!strcmp(clasa,"WebcamClass"))<br />
    {<br />
        mainwin=hwnd;<br />
        EnumChildWindows(hwnd,findchildweb,0);<br />
        return false;<br />
<br />
    }<br />
<br />
<br />
<br />
<br />
<br />
    return true;<br />
}<br />
<br />
<br />
<br />
//--------------------------------------------------------<br />
<br />
bool findandcapture()<br />
{<br />
     frame=NULL;<br />
     HDC devcnt=NULL,devc=NULL,cmpdc=NULL;<br />
     RECT dim={0};<br />
     HBITMAP bmp=NULL;<br />
     BYTE *memory=0;<br />
<br />
    BITMAPFILEHEADER fileHeader;<br />
    BITMAPINFOHEADER infoHeader;<br />
    BITMAPINFO info;<br />
    int numframe=-1;<br />
<br />
    char cur[150]={0},prev[150]={0};<br />
    <br />
<br />
<br />
    <br />
<br />
<br />
    EnumWindows(findwebwnd,0);<br />
<br />
<br />
    <br />
    <br />
    if(frame!=NULL)<br />
    devcnt=GetWindowDC(frame);<br />
    else<br />
        return false;<br />
<br />
    GetWindowRect(frame,&dim);<br />
<br />
    int bitmap_dx = dim.right - dim.left;<br />
    int bitmap_dy = dim.bottom - dim.top;<br />
<br />
//------------headerul bitmap----------------------<br />
    fileHeader.bfType      = 0x4d42;<br />
         fileHeader.bfSize      = 0;<br />
         fileHeader.bfReserved1 = 0;<br />
         fileHeader.bfReserved2 = 0;<br />
         fileHeader.bfOffBits   = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);<br />
<br />
         infoHeader.biSize          = sizeof(infoHeader);<br />
         infoHeader.biWidth         = bitmap_dx;<br />
         infoHeader.biHeight        = bitmap_dy;<br />
         infoHeader.biPlanes        = 1;<br />
         infoHeader.biBitCount      = 24;<br />
         infoHeader.biCompression   = BI_RGB;<br />
         infoHeader.biSizeImage     = 0;<br />
         infoHeader.biXPelsPerMeter = 0;<br />
         infoHeader.biYPelsPerMeter = 0;<br />
         infoHeader.biClrUsed       = 0;<br />
         infoHeader.biClrImportant  = 0;<br />
         info.bmiHeader = infoHeader;<br />
<br />
<br />
//------------headerul bitmap----------------------<br />
<br />
             cmpdc=CreateCompatibleDC(devcnt);<br />
<br />
    bmp=CreateDIBSection(devcnt, &info, DIB_RGB_COLORS, (void**)&memory, 0, 0);<br />
    DWORD eror=GetLastError();<br />
    SelectObject(cmpdc,bmp);<br />
<br />
<br />
<br />
    while(1)<br />
    {<br />
        <br />
<br />
        if(strcmp(cur,prev) || strstr(prev,"Broad")!=NULL)<br />
        {<br />
                numframe++;<br />
<br />
        GetWindowText(last,cur,150);<br />
<br />
            BitBlt(cmpdc, 0, 0, bitmap_dx, bitmap_dy, devcnt, 0, 0, SRCCOPY);<br />
<br />
             int bytes = (((24*bitmap_dx + 31) & (~31))/8)*bitmap_dy;<br />
<br />
<br />
<br />
              writebmpfile(bitmap_dx,bitmap_dy, bytes, memory,fileHeader,infoHeader,numframe);<br />
<br />
<br />
             DeleteObject(bmp);<br />
<br />
              if(UpdateWindow(mainwin)==false)<br />
                  break;<br />
<br />
              if(strstr(prev,"Broad")!=NULL)<br />
                  Sleep(500);<br />
<br />
        }<br />
        else<br />
            Sleep(1);<br />
<br />
<br />
        GetWindowText(last,prev,150);<br />
<br />
<br />
<br />
<br />
    Sleep(1);<br />
    }<br />
<br />
<br />
<br />
<br />
    DeleteDC(cmpdc);<br />
    ReleaseDC(frame, devcnt);<br />
<br />
<br />
<br />
<br />
<br />
    return true;<br />
}<br />
<br />
//---------------------------------------------------------------------------------------------<br />
<br />
bool writebmpfile(int bitmap_dx,int bitmap_dy,int bytes, BYTE *memory,BITMAPFILEHEADER fileHeader,BITMAPINFOHEADER infoHeader,int frame)<br />
{<br />
<br />
<br />
<br />
<br />
    FILE *fisier;<br />
    <br />
    <br />
    sprintf(cadre[frame].cadru,"%s_%d.%s","frame",frame,"bmp");<br />
<br />
        <br />
<br />
         fisier=fopen(cadre[frame].cadru,"w+");<br />
<br />
<br />
<br />
         fwrite((char*)&fileHeader,1,sizeof(fileHeader),fisier);<br />
<br />
         fwrite((char*)&infoHeader,1,sizeof(infoHeader),fisier);<br />
<br />
         fwrite(memory,1,bytes,fisier);<br />
<br />
    <br />
<br />
         fclose (fisier);<br />
<br />
<br />
<br />
<br />
    return true;<br />
}<br />
<br />
<br />
<br />

Mark Salsbery30-Nov-07 9:46

30-Nov-07 9:46

What do you mean by "scrambled"?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

csmanul30-Nov-07 11:58

30-Nov-07 11:58

the picture has interference like an old tv or a cracked LCD display

Mark Salsbery30-Nov-07 12:12

30-Nov-07 12:12

I don't have an old TV or a cracked LCD display to compare to.
Can you post an example image somewhere?

If it works on some windows and not others, then I imagine it's
a problem with the way the video is being rendered (DirectX,
for example), you're scraping the screen out of sync with the video
refresh, or you're getting frames in between key frames.

Just guesses...
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

csmanul30-Nov-07 12:58

30-Nov-07 12:58

http://rapidshare.com/files/73346892/frame_2.bmp.html here is the sample image and i noticed that CreateDIBSection returns Not enough storage is available to process this command.

Mark Salsbery30-Nov-07 13:18

30-Nov-07 13:18

I couldn't see the image, but I've been trying to find something in the code.

Shouldn't the DeleteObject(bmp); call be outside/after the while() loop?

You should also select bmp out of the memory DC (by selecting its original bitmap back in)
before you delete it.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Mark Salsbery30-Nov-07 13:28

30-Nov-07 13:28

Does this work (changes marked in color)?

bool findandcapture()
{
    frame=NULL;
    HDC devcnt=NULL,devc=NULL,cmpdc=NULL;
    RECT dim={0};
    HBITMAP bmp=NULL;
    BYTE *memory=0;

    BITMAPFILEHEADER fileHeader;
    BITMAPINFOHEADER infoHeader;
    BITMAPINFO info;
    int numframe=-1;

    char cur[150]={0},prev[150]={0};


    EnumWindows(findwebwnd,0);


    if(frame!=NULL)
        devcnt=GetWindowDC(frame);
    else
        return false;

    GetWindowRect(frame,&dim);

    int bitmap_dx = dim.right - dim.left;
    int bitmap_dy = dim.bottom - dim.top;

    //------------headerul bitmap----------------------
    fileHeader.bfType = 0x4d42;
    fileHeader.bfSize = 0;
    fileHeader.bfReserved1 = 0;
    fileHeader.bfReserved2 = 0;
    fileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);

    infoHeader.biSize = sizeof(infoHeader);
    infoHeader.biWidth = bitmap_dx;
    infoHeader.biHeight = bitmap_dy;
    infoHeader.biPlanes = 1;
    infoHeader.biBitCount = 24;
    infoHeader.biCompression = BI_RGB;
    infoHeader.biSizeImage = 0;
    infoHeader.biXPelsPerMeter = 0;
    infoHeader.biYPelsPerMeter = 0;
    infoHeader.biClrUsed = 0;
    infoHeader.biClrImportant = 0;
    info.bmiHeader = infoHeader;


    //------------headerul bitmap----------------------

    cmpdc=CreateCompatibleDC(devcnt);

    bmp=CreateDIBSection(devcnt, &info, DIB_RGB_COLORS, (void**)&memory, 0, 0);
    DWORD eror=GetLastError();
    <font color="Red">HGDIOBJ hOldBMP = </font>SelectObject(cmpdc,bmp);


    <font color="Green">// Moved out of while loop</font>
    <font color="Red">int bytes = (((24*bitmap_dx + 31) & (~31))/8)*bitmap_dy;</font>

    while(1)
    {
        if(strcmp(cur,prev) || strstr(prev,"Broad")!=NULL)
        {
            numframe++;

            GetWindowText(last,cur,150);

            BitBlt(cmpdc, 0, 0, bitmap_dx, bitmap_dy, devcnt, 0, 0, SRCCOPY);

           
<font color="Green">            // Moved out of while loop</font>
            <font color="Red">//int bytes = (((24*bitmap_dx + 31) & (~31))/8)*bitmap_dy;</font>



            writebmpfile(bitmap_dx,bitmap_dy, bytes, memory,fileHeader,infoHeader,numframe);
<font color="Green">

            // Moved out of while loop</font>             <font color="Red">
            //DeleteObject(bmp);</font>

            if(UpdateWindow(mainwin)==false)
                break;

            if(strstr(prev,"Broad")!=NULL)
                Sleep(500);

        }
        else
            Sleep(1);


        GetWindowText(last,prev,150);




        Sleep(1);
    }


    <font color="Red">SelectObject(cmpdc,hOldBMP);
    DeleteObject(bmp);</font>

    DeleteDC(cmpdc);
    ReleaseDC(frame, devcnt);


    return true;
}

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

csmanul30-Nov-07 13:38

30-Nov-07 13:38

nope same problem and getlasterror still returns Not enough storage after the CreateDIBsection func. i think there is the problem maybe i miscalculated something on the bitmap structures , what do you think ?

P.S : thanks for your kindness to help me

Mark Salsbery30-Nov-07 13:46

30-Nov-07 13:46

It looks ok to me - I'm not sure what I'm missing (obviously Smile | :)

)

CreateDIBSection is returning NULL and then GetLastError() returns what?
The only thing that should affect that is the width and height - what are those values?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

csmanul30-Nov-07 13:55

Dial up connection on Vista

30-Nov-07 13:55

width=324 and height=244 i get them from GetWindowRect(frame,&dim). if you would like to simplify our communication add my ymsg id : csman_ul

Sonani Prakash30-Nov-07 4:31

Sonani Prakash

30-Nov-07 4:31

Hi
I have created Custom dll to override the Windows OS Dialler.
for that we need to make the appr. entry of our dll into rasphone.pbk

CustomRasDialDll=c:\,....\customDial.dll

Now problem is if I open windows mail it triggers the dll and which finally calls "RasCustomDialDlg" method,which connects through the internet using the RasDial API,
But after that i disconnect the conneciton and again try to open the Windows mail so it should again call my dll's RasCustomDialDlg
But it's not doing so intead it calls system dialler..that i want to avoid..
It seems after doing first time conneciton it changes some regsitry entry which causes this ? not sure

please advice. if u do not understnd let me know i can explain in brief..

thanks,
Prakash.

sonani prakash

runtime library option

George_George30-Nov-07 3:47

George_George

30-Nov-07 3:47

Hello everyone,

There are 4 runtime library options, my understanding is,

1. /MT static link to CRT release version
2. /MTd static link to CRT debug version
3. /MD dynamic link to CR release version
4. /MDd dynamic link to CRT debug version

Is my understanding correct?

thanks in advance,
George

Re: runtime library option

CPallini30-Nov-07 3:56

CPallini

30-Nov-07 3:56

You simply missed that all options refer to multithreaded version of the run-time library.
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: runtime library option

Matthew Faithfull30-Nov-07 4:23

Matthew Faithfull

30-Nov-07 4:23

I think the single threaded library is deprecated as of VS 2005 and not available. Unless I missed a hack somewhere Unsure | :~

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: runtime library option

CPallini30-Nov-07 4:27

CPallini

30-Nov-07 4:27

I didn't know about. Blush | :O

Anyway is worth noting that the libraries are all multithreaded (even if you have no alternative).
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

SourceSafe problem

followait30-Nov-07 2:39

30-Nov-07 2:39

1. download a project rar, extract it into a directory
2. add to vss6, not through vc6, just open sourcesafe directly, and add the project's root directory to vss6 recursively
3. delete the project outside sourcesafe

When I want to get it out again, I tried both "Get Lastest Version" and "Check out", though the project is get out of vss6, but it seems not associated with vss6. How to let the project files be controlled under vss6?

PS: I leave the working fold by default when get or check out, and check off "Make writable".

David Crow30-Nov-07 3:07

David Crow

30-Nov-07 3:07

followait wrote:
...but it seems not associated with vss6.

What exactly does this mean?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

followait30-Nov-07 3:20

30-Nov-07 3:20

It means that when I want to edit the file, I need not check it out, and when I finished editing, I can't check it in.

krmed30-Nov-07 3:51

krmed

30-Nov-07 3:51

Visual C++ (6.0) has a place in the .dsp file to indicate that each file is/is not under source control. If that entry isn't in the .dsp, VC6 won't attempt to use source control. I suspect VS 7 also works like that, since VS2005 work the same way.

This occurred because the file you unzipped was never in VC++ to begin with, and when you added to VSS, it didn't have the .dsp showing that it should be under VSS control.

Not sure about VSS, but with ClearCase, I could simply open that project in VC, then select the files and "Add to Source Control". (Note that your .dsp must be writable at this time.) This causes VC to update the dsp file with the SCC information.

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

followait30-Nov-07 16:26

30-Nov-07 16:26

Thanks, I'm clear now.

The .dsw has to .dsp and a deep directory hierarchy, so I add it through sourcesafe directly. I'll try to add them through VC++.

followait30-Nov-07 16:39