////////////////////////////////////////////////
//小弟工作之余写了一个程序，
//注意，该程序非常占用CPU时间，它的唯好处就是简单，可以一个象素一个象素的操作
//您还可以根据需要改变象素的值达到特殊的效果。
//本程序在WIN2000下测试通过，可以获取256色以上个种分辨率的屏幕
//自定义RGB象素Structure
typedef struct tagRBBREQUIRED
{
BYTE rgbBlue;
BYTE rgbGREEN;
BYTE rgbRed;
} RGBREQUIRED, *PRGBREQUIRED;
int APIENTRY WinMain ( HINSTANCE hInstance,
HINSTance hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HDC hdcScr;
int cx, cy;
BITMAPFILEHEADER BFH;
BITMAPINFOHEADER BIH;
WORD wType;
LONG lSize;
LONG lPixNum;
BYTE byte;
PRGBREQUIRED pPixel = NULL;
fstream *out;
cx = GetSystemMetrics ( SM_CXSCREEN );
cy = GetSystemMetrics ( SM_CYSCREEN );
lSize = sizeof ( RGBREQUIRED ) * cy * cx;
lPixNum = cy * cx ;
byte = 'M';
wType = (byte << 8);
byte = 'B';
wType = wType + byte;
//填写位图信息头
BIH.biSize = sizeof (BIH);
BIH.biHeight = cy;
BIH.biWidth = cx;
BIH.biClrImportant = 0;
BIH.biClrUsed = 0;
BIH.biCompresion = BI_RGB;
BIH.biPlaned = 1;
BIH.biSizeImage = lSize + 44;
BIH.biXPelsPerMeter = 3780;
BIH.biYPelsPerMeter = 3780;
BIH.biBitCount = 24;
//填写位图文件头
BFH.bfType = wType;
BFH.bfSize = lSize;
BFH.bfOffBits = sizeof ( BFH ) + sizeof ( BIH );
BFH.bfReserved1 = 0;
BFH.bfReserved2 = 0;
hdcScr = GetDC ( NULL );
if ( !hdcScr )
{
MessageBox ( NULL, "Can't get the screen handle", "Error", MB_OK );
return 0;
}
pPixel = new RGBREQUIRED[lPixNum];
if ( !pPixel )
{
MessageBox ( NULL, "Can't alloc memory", "Error", MB_OK);
return 0;
}
memset ( ( void * ) pPixel, 0, lSize );
PRGBREQUIRED pTemp = pPixel;
RGBREQUIRED TmpPix;
DWORD colorRef;
int i, j;
for ( i=cy-1; i>=0; i-- )
for ( j=0 ; j<cx; j++ )
{
colorRef = GetPixel ( hdcScr, j, i ); //获取象素的色彩值00BBGGRR
TmpPix.rgbBlue = (BYTE) ( ( colorRef & 0x00ff0000 ) >> 16 );
TmpPix.rgbGreen = (BYTE) ( ( colorRef & 0x0000ff00 ) >> 16 );
TmpPix.rgbRed = (BYTE) ( colorRef & 0x000000ff );
*pTemp = TmpPix;
}
//保存文件
out = new fstream ( "screen.bmp", ios::out|ios::binary, filebuf::sh_none );
if ( !out )
{
delete pPixel;
pPixel = NULL;
pTemp = NULL;
MessageBox ( NULL, "Can't open file", "Error", MB_OK );
return 0;
}
out->write ( ( char* )&BFH, sizeof ( BITMAPFILEHEADER ) ); //写入位图文件头
out->write ( ( char* )&BIH, sizeof ( BITMAPINFOHEADER ) ); //写入位图信息头
out->write ( ( char* )&pPixel, lSize );
out->close();
delete pPixel;
pPixel = NULL;
pTemp = NULL;
MessageBox ( NULL, "Copy screen successfully!", "Congratulations", MB_OK);
return 0;
}
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