C生成曲线BMP

 C生成曲线BMP   http://zhidao.baidu.com/question/222913503.html     屏幕截屏 http://topic.csdn.net/u/20120822/13/e52e7b2a-e151-4985-9aa7-934d9f38c8de.html   #include "stdafx.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #include<Windows.h> typedef unsigned char  BYTE; typedef unsigned short WORD; typedef unsigned long  DWORD; typedef long                  LONG;   #pragma pack (2)         int SaveBitmapToFile(BITMAP *bitmap, LPCWSTR lpFileName,char *lpBuf) {    DWORD dwWritten;    BITMAPFILEHEADER   bmfHdr;    BITMAPINFOHEADER   bi;    HANDLE          fh=NULL;    bi.biSize = sizeof(BITMAPINFOHEADER);    bi.biWidth= bitmap->bmWidth;    bi.biHeight = bitmap->bmHeight;    bi.biPlanes = 1;    bi.biBitCount      = bitmap->bmBitsPixel*8;    bi.biCompression   = BI_RGB;    bi.biSizeImage     = 0;    bi.biXPelsPerMeter = 0;    bi.biYPelsPerMeter = 0;    bi.biClrUsed       = 0;    bi.biClrImportant  = 0;    fh = CreateFile(lpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);    if (fh == INVALID_HANDLE_VALUE) return FALSE;    bmfHdr.bfType = 0x4D42; // "BM"    bmfHdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+bitmap->bmWidth*bitmap->bmHeight*bitmap->bmBitsPixel;    bmfHdr.bfReserved1 = 0;    bmfHdr.bfReserved2 = 0;    bmfHdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER);    WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);    WriteFile(fh, ( char *)&bi,sizeof (BITMAPINFOHEADER), &dwWritten, NULL);    WriteFile(fh, ( char *)lpBuf,bitmap->bmWidth*bitmap->bmHeight*bitmap->bmBitsPixel, &dwWritten, NULL);    FlushFileBuffers(fh);    CloseHandle(fh);    return true; }     int GetBitmapFromScreen(LPCWSTR lpFileName) {     char *lpBuf;     HBITMAP hBitmap,hOld ;     HDC hDC,hcDC;     BITMAP bb;     BITMAPINFO b;     HANDLE hp,fh=NULL;     DWORD dwX,dwY;       dwX=GetSystemMetrics(SM_CXSCREEN);     dwY=GetSystemMetrics(SM_CYSCREEN);     hDC=GetDC(NULL);     hcDC=CreateCompatibleDC(hDC);     hBitmap=CreateCompatibleBitmap(hDC,dwX,dwY);     hOld=(HBITMAP)SelectObject(hcDC,hBitmap);     BitBlt(hcDC,0, 0,dwX,dwY, hDC, 0, 0, SRCCOPY);     bb.bmWidth=dwX;     bb.bmHeight =dwY;     bb.bmPlanes = 1;     bb.bmWidthBytes=bb.bmWidth*3;     bb.bmBitsPixel=3;     bb.bmType=0;     b.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);     b.bmiHeader.biWidth        =dwX;     b.bmiHeader.biHeight       =dwY;     b.bmiHeader.biPlanes       =1;     b.bmiHeader.biBitCount     =3*8;     b.bmiHeader.biCompression  =BI_RGB;     b.bmiHeader.biSizeImage    =0;     b.bmiHeader.biXPelsPerMeter=0;     b.bmiHeader.biYPelsPerMeter=0;     b.bmiHeader.biClrUsed      =0;     b.bmiHeader.biClrImportant =0;     b.bmiColors[0].rgbBlue     =8;     b.bmiColors[0].rgbGreen    =8;     b.bmiColors[0].rgbRed      =8;     b.bmiColors[0].rgbReserved =0;     hp=GetProcessHeap();     lpBuf=( char *)HeapAlloc(hp,HEAP_ZERO_MEMORY,bb.bmHeight*bb.bmWidth*4);     GetDIBits(hcDC,hBitmap,0,dwY,lpBuf,&b,DIB_RGB_COLORS);     SaveBitmapToFile(&bb,lpFileName,lpBuf);     ReleaseDC(NULL,hDC);     DeleteDC(hcDC);     DeleteObject(hBitmap);     DeleteObject(hOld);     HeapFree(hp,0,lpBuf);     return true; }     int _tmain(int argc, _TCHAR* argv[]) {             LPCWSTR path = L "E:\\e.bmp";              GetBitmapFromScreen(path);                return 0; }