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ScreenPipe.cpp

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// ScreenPipe.cpp: implementation of the ScreenPipe class.


#include "stdafx.h"
#include "ScreenPipe.h"

#define BUFFER_LIES_BYTE_FACTOR 23

#define BUFFER_SIZE sizeof(BYTE)*240*320+(sizeof(BYTE)*3*256)+sizeof(screenInfo) \
    * BUFFER_LIES_BYTE_FACTOR

// Construction/Destruction

ScreenPipe::ScreenPipe(const TString &name)
:PServer(TString( TEXT("Screen") ) + name, 
    false, 
    BUFFER_SIZE)
{}

// Member Functions

DWORD ScreenPipe::readToDIB(DIBitmap &destination)
{
    DWORD numBytesRead;
    bool isOk;

    screenInfo header;
    isOk = ReadFile( 
                hPipe,                  // Read from
                &header,                // data buffer
                sizeof(screenInfo),     // number of bytes to read
                &numBytesRead,          // number of bytes read
                NULL);                  // not overlapped
    
    if( !isOk || (numBytesRead != sizeof(screenInfo)) )
        return readError();

    if( header.hdrSize != sizeof(screenInfo) ){
        return SP_INVALID_DATA;
    }

    if( !(destination.getPBITMAPINFOHEADER()->biBitCount == header.bitCount
            && destination.getPBITMAPINFOHEADER()->biHeight == header.height
            && destination.getPBITMAPINFOHEADER()->biWidth == header.width) ){

        if( !destination.createCompatible(header.width, header.height, header.bitCount))
            return SP_ERROR_CREATING_BITMAP;
    }

    LPRGBQUAD palette = destination.getPPalette();
    RGBTRIPLE entry;
    for(int i=0; i < header.clrUsed; i++, palette++){

        isOk = ReadFile(hPipe, &entry, sizeof(RGBTRIPLE), &numBytesRead, NULL);
        if( !isOk || (numBytesRead != sizeof(RGBTRIPLE)) )
            return readError();

        palette->rgbBlue = entry.rgbtBlue;
        palette->rgbGreen = entry.rgbtGreen;
        palette->rgbRed = entry.rgbtRed;
        palette->rgbReserved = 0;
    }

    // See DIBitmap documentation for explanation of this formula
    const DWORD size = (((( header.width * header.bitCount ) + 31) & ~31) >> 3) * header.height;

    isOk = ReadFile(hPipe, destination.getPBytes(), size, &numBytesRead, NULL);
    if( !isOk || (numBytesRead != size ) )
        return readError();

    return SP_SUCCESS;
}

DWORD ScreenPipe::readError()
{
    switch(GetLastError()) {
        case ERROR_SECTOR_NOT_FOUND:
            disconnect();
            return SP_NOT_CONNECTED;
        case ERROR_SUCCESS:     // EOF?
        case ERROR_READ_FAULT:
        default:
            return SP_UNKNOWN_ERROR;
    }
}

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