最简单的屏幕拷贝程序（象素拷贝）

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//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;

}