****首先感谢巨人的肩膀,让小白能够走出bitmap图片的苦海。****

自己闲的没事想通过c++ 的MFC来截屏并上传服务器展示客户端的当前界面。中间一路降妖伏魔....(此处省略2048个字节),发扬程序猿无私奉献的优良品质,分享源代码来众生同乐。


1.好戏在前头,请在.h添加下面这些东东....

typedef struct _BMPINFO

{

int bmpWidth;//图像的宽

int bmpHeight;//图像的高

int biBitCount;//图像类型,每像素位数

RGBQUAD pColorTable[256];//颜色表指针

unsigned char pBmpBuf[10240000];

}m_bmpinfo,*p_bmpinfo;


//获取截屏

void getScreen(char* filename);

int readBmp(const char* bmpName, unsigned char* pBmpBuf,int& bmpWidth,int& bmpHeight,int& biBitCount,RGBQUAD *pColorTable);

int sendReadBmp(char* filename,p_bmpinfo bmpinfo);

int recvSaveBmp(char* filename,p_bmpinfo bmpinfo);

int saveBmp(const char* bmpName,unsigned char *pBmpBuf,int& bmpWidth,int& bmpHeight,int& biBitCount,RGBQUAD *pColorTable);


--------------------------累了吧,关了网页休息会--------------------------------------

2.截屏接口,保存截屏(格式为.bmp)到指定路径

in char* filenam:需要保存截屏的文件路径

void getScreen(char* filename)

{

CDC *pDC;//屏幕DC

pDC = CDC::FromHandle(GetDC(NULL));//获取当前整个屏幕DC

int BitPerPixel = pDC->GetDeviceCaps(BITSPIXEL);//获得颜色模式

int Width = pDC->GetDeviceCaps(HORZRES);

int Height = pDC->GetDeviceCaps(VERTRES);

CDC memDC;//内存DC

memDC.CreateCompatibleDC(pDC);

CBitmap memBitmap, *oldmemBitmap;//建立和屏幕兼容的bitmap

memBitmap.CreateCompatibleBitmap(pDC, Width, Height);

oldmemBitmap = memDC.SelectObject(&memBitmap);//将memBitmap选入内存DC

memDC.BitBlt(0, 0, Width, Height, pDC, 0, 0, SRCCOPY);//复制屏幕图像到内存DC

//以下代码保存memDC中的位图到文件

BITMAP bmp;

memBitmap.GetBitmap(&bmp);//获得位图信息

FILE *fp = fopen(filename, "w+b");


BITMAPINFOHEADER bih = {0};//位图信息头

bih.biBitCount = bmp.bmBitsPixel;//每个像素字节大小

bih.biCompression = BI_RGB;

bih.biHeight = bmp.bmHeight;//高度

bih.biPlanes = 1;

bih.biSize = sizeof(BITMAPINFOHEADER);

bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;//图像数据大小

bih.biWidth = bmp.bmWidth;//宽度

BITMAPFILEHEADER bfh = {0};//位图文件头

bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//到位图数据的偏移量

bfh.bfSize = bfh.bfOffBits + bmp.bmWidthBytes * bmp.bmHeight;//文件总的大小

bfh.bfType = (WORD)0x4d42;

fwrite(&bfh, 1, sizeof(BITMAPFILEHEADER), fp);//写入位图文件头

fwrite(&bih, 1, sizeof(BITMAPINFOHEADER), fp);//写入位图信息头

byte * p = new byte[bmp.bmWidthBytes * bmp.bmHeight];//申请内存保存位图数据

GetDIBits(memDC.m_hDC, (HBITMAP) memBitmap.m_hObject, 0, Height, p,

(LPBITMAPINFO) &bih, DIB_RGB_COLORS);//获取位图数据

fwrite(p, 1, bmp.bmWidthBytes * bmp.bmHeight, fp);//写入位图数据

delete [] p;

fclose(fp);

memDC.SelectObject(oldmemBitmap);

}

--------------------------累了吧,后面没有了--------------------------------------

-----------------------------------------------------------------------------------

3.读取指定位置BMP相关信息到内存中

inconst char* bmpName, BMP路径

out unsigned char* pBmpBuf,BMP数据信息

outint& bmpWidth,BMP宽度

outint& bmpHeight,BMP高度

outint& biBitCount,BMP的像素位数

outRGBQUAD *pColorTable色彩版


int readBmp(const char* bmpName, unsigned char* pBmpBuf,int& bmpWidth,int& bmpHeight,int& biBitCount,RGBQUAD *pColorTable)

{

FILE *fp=fopen(bmpName,"rb");

if(fp==0)

{

printf("cannot open file");

return FALSE;

}

fseek(fp,sizeof(BITMAPFILEHEADER),0);

BITMAPINFOHEADER head;

fread(&head,sizeof(BITMAPINFOHEADER),1,fp);

bmpWidth = head.biWidth;

bmpHeight = head.biHeight;

biBitCount = head.biBitCount;

int lineByte = (bmpWidth *biBitCount/8+3)/4*4;//计算图像每行像素所占的字节数

if(biBitCount == 8)

{

pColorTable = new RGBQUAD[256];

fread(pColorTable,sizeof(RGBQUAD),256,fp);

}

fread(pBmpBuf,1,lineByte *bmpHeight,fp);

fclose(fp);

return TRUE;

}

3.1 便于上层调用和重构提供一个封装接口,将所有参数到一个结构体中,可便于socket传输(我4不4很聪明,请叫我少先队员)

inchar* filename,BMP路径

out p_bmpinfo bmpinfo BMP数据结构体

int sendReadBmp(char* filename,p_bmpinfo bmpinfo)

{

if(readBmp(filename, bmpinfo->pBmpBuf, bmpinfo->bmpWidth, bmpinfo->bmpHeight, bmpinfo->biBitCount, bmpinfo->pColorTable))

{

return TRUE;

}

return FALSE;

}

--------------------累了吧,么有了------------------------------------------------------







--------------------累了吧,真的么有了----------------------------------------------------





--------------------真的,真的么有了----------------------------------------------------

4.将内存中的BMP数据写入到本地文件

inconst char* bmpName, 本地需保存的BMP文件路径

inunsigned char *pBmpBuf,read得到的BMP数据

inint& bmpWidth,BMP宽度

inint& bmpHeight,BMP高度

inint& biBitCount,BMP像素位数

inRGBQUAD *pColorTable调色板


int saveBmp(const char* bmpName,unsigned char *pBmpBuf,int& bmpWidth,int& bmpHeight,int& biBitCount,RGBQUAD *pColorTable)

{

if(!pBmpBuf)//imgBuf 待存盘的位图数据

return 0;

int i,j;

//每行字节数

int lineByte=(bmpWidth*biBitCount/8+3)/4*4;

//循环变量,针对彩×××像,遍历每像素的三个分量

int k;

//将图像左下角1/4部分置成黑色

if(biBitCount==8)

{//对于灰度图像

for(i=0;i<bmpHeight/2;i++)

{

for(j=0;j<bmpWidth/2;j++)

{

*(pBmpBuf+i*lineByte+j)=0;

}

}

}

else if(biBitCount==24)

{//彩×××像

for(i=0;i<bmpHeight/2;i++)

{

for(j=0;j<bmpWidth/2;j++)

{

for(k=0;k<3;k++)//每像素RGB三个分量分别置0才变成黑色

*(pBmpBuf+i*lineByte+j*3+k)=0;

}

}

}

int colorTablesize = 0;

if(biBitCount == 8)

colorTablesize = 1024;

FILE *fp = fopen(bmpName,"wb");

if(fp == 0) return 0;

BITMAPFILEHEADER fileHead;

fileHead.bfType= 0x4d42;

fileHead.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER) + colorTablesize + lineByte *bmpHeight;

fileHead.bfReserved1 = 0;

fileHead.bfReserved2 = 0;

fileHead.bfOffBits = 54 +colorTablesize;

fwrite(&fileHead,sizeof(BITMAPFILEHEADER),1,fp);

BITMAPINFOHEADER head;

head.biBitCount = biBitCount;

head.biClrImportant = 0;

head.biClrUsed = 0;

head.biCompression = 0;

head.biHeight = bmpHeight;

head.biPlanes =1;

head.biSize = 40;

head.biSizeImage = lineByte *bmpHeight;

head.biWidth = bmpWidth;

head.biXPelsPerMeter = 0;

head.biYPelsPerMeter = 0;

fwrite(&head,sizeof(BITMAPINFOHEADER),1,fp);

if(biBitCount == 8)

fwrite(pColorTable,sizeof(RGBQUAD),256,fp);

fwrite(pBmpBuf,bmpHeight * lineByte,1,fp);

fclose(fp);

return TRUE;

}

4.1 便于socket将接收到的结构体写入本地文件,上层封装了一层,主要与3.1配套使用

int recvSaveBmp(char* filename,p_bmpinfo bmpinfo)

{

saveBmp(filename, bmpinfo->pBmpBuf, bmpinfo->bmpWidth, bmpinfo->bmpHeight, bmpinfo->biBitCount, bmpinfo->pColorTable);

return TRUE;

}

---------------------------------测试代码------------------------------------------------
发送端:

p_bmpinfo bmpinfo = (p_bmpinfo)malloc(sizeof(m_bmpinfo));

sendReadBmp(sFileName,bmpinfo);

socketSend(client,(char*)bmpinfo,sizeof(m_bmpinfo));//socket发送


接收端:

p_bmpinfo bmpinfo = (p_bmpinfo)malloc(sizeof(m_bmpinfo));

int len;

SOCKET socket = socketAccept(server); //socket监听

do {

len = socketRecv(socket,(char*)bmpinfo,sizeof(m_bmpinfo));//socket接受数据

recvSaveBmp(sFileName,bmpinfo);

} while(0 != len);


--------------------------------么有了,木骗你------------------------------------






--------------------------------么有了,俺真木骗你------------------------------------