VC图像处理SetDIBits后，再getdibits后只有最后加进的文字，原背景没了！

littleline 2017-11-30 07:53:09

FILE *fp=fopen("11.bmp", "rb");
if(fp == 0)
return;

fseek(fp, sizeof(BITMAPFILEHEADER), 0);
BITMAPINFOHEADER head;
fread(&head, sizeof(BITMAPINFOHEADER), 1, fp);
int bmpHeight = head.biHeight;
int bmpWidth = head.biWidth;
int biBitCount = head.biBitCount;
// int lineByte = (bmpWidth*biBitCount/8+3)/4*4;
int nBpp = head.biBitCount;
// int lineByte = (bmpWidth*nBpp+31)/32*4; //bmp 4 bytes align
int lineByte = 4*(bmpWidth * biBitCount + 31)/32;

unsigned char *pBmpBuf = new unsigned char[lineByte*bmpHeight];
fread(pBmpBuf, 1, lineByte*bmpHeight, fp);

CDC *m_pMemDC;
m_pMemDC = new CDC();
CDC *pDC;
pDC = GetDC();
m_pMemDC->CreateCompatibleDC(pDC);
CBitmap *m_pMemBmp = new CBitmap(); //根据图片的大小创建一个兼容位图
m_pMemBmp->CreateCompatibleBitmap(pDC, bmpWidth, bmpHeight);
m_pMemDC->SelectObject(m_pMemBmp);

// // 把图像的数据绘制到兼容位图上
int ret = SetDIBits(pDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->GetSafeHandle(),
0, bmpHeight, (LPVOID)pBmpBuf, (LPBITMAPINFO)&head, DIB_RGB_COLORS);

////////////////////////////////
m_pMemDC->SetBkMode(TRANSPARENT);
m_pMemDC->SetTextColor(RGB(255, 255, 255));

//设置字体
CFont font;
font.CreatePointFont(5000,"宋体");//字体大小+字体名称

m_pMemDC->SelectObject(&font);
// 添加文字到指定位置
m_pMemDC->TextOut(100, 100, "hello1111");

/////////////////////只有"hello111"

unsigned char *pTemp = new unsigned char[lineByte*bmpHeight];

BITMAPINFO *m_pBMI;

BITMAPINFOHEADER bi;
BITMAP BM;

// CClientDC dc(this);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bmpWidth;
bi.biHeight =bmpHeight;
bi.biPlanes = 1;
bi.biBitCount = 1;
bi.biCompression = 0;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
// bi.biSizeImage = head.biSizeImage;

m_pBMI=(BITMAPINFO*)new char[sizeof(BITMAPINFO)];

memcpy(m_pBMI,&bi,sizeof(BITMAPINFOHEADER));

ret = GetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->GetSafeHandle(), 0l, (DWORD)bmpHeight,
(LPVOID)pTemp,(LPBITMAPINFO)&head, (DWORD)DIB_RGB_COLORS);

int dw = GetLastError();

///////////////////////////以下写tiff
uint32 width, height;
uint16 depth = 1;

TIFF *out = TIFFOpen("21112.tif", "w");//打开TIFF文件

TIFFSetField(out, TIFFTAG_SUBFILETYPE, FILETYPE_PAGE);//表示存的图是多帧的
int nCur ;//当前的帧数
int nTotal;//总帧数
TIFFSetField(out, TIFFTAG_PAGENUMBER, nCur,nTotal);//设置该帧属性

width = bmpWidth;
height = bmpHeight;

TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);
TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, height);

TIFFSetField(out, TIFFTAG_COMPRESSION, COMPRESSION_CCITTFAX4);
TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
TIFFSetField(out, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

TIFFSetField(out, TIFFTAG_XRESOLUTION, 300);
TIFFSetField(out, TIFFTAG_YRESOLUTION, 300);
TIFFSetField(out, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);

//TIFF按LZH压缩

uint32 offset, size;
char *scanbuf;
size = ((width *biBitCount + 31) /32)*4;
scanbuf = (char *) _TIFFmalloc(size);
int nBitsPerPixel = biBitCount;
for(int nLines = 0; nLines < height; nLines++)
{
DWORD dwWidthBytes = ((width * biBitCount + 31) /32)*4;
LPBYTE p = new BYTE[dwWidthBytes];
memcpy(p, pTemp + (height - 1 - nLines) * dwWidthBytes, dwWidthBytes);
//从BGR 转到RGB
if(nBitsPerPixel == 24 || nBitsPerPixel == 32)
{
LPBYTE pTempData = p;
for(int i = 0; i < width; i++)
{
BYTE temp = *pTempData; //R
*pTempData = *(pTempData + 2);
*(pTempData + 2) = temp;
//m_dwBitsPerPixel may be 32 or 24
pTempData += nBitsPerPixel / 8;
}
}
TIFFWriteScanline(out, p, nLines, 0);
delete p;
p = NULL;
}

_TIFFfree(scanbuf);
TIFFWriteDirectory(out);

//到这里，向TIFF文件加了一张图，如再加下一张的话，循环操作
// 全部结束后，一定要
TIFFClose(out);

之前的Set背景的就没了，只有最后加的一行字和白板

...全文