在bmp上添加字符 分类： VC++ 2013-09-09 14:40 822人阅读 评论(3) 收藏

//打开位图文件,得到位图句柄

HBITMAP OpenBmpFile(HDC hDC, LPSTR lpszFileName)

{

HBITMAP hBmp = NULL;

//读位图文件,得到位图句柄

HANDLE hFile = CreateFile(

lpszFileName,

GENERIC_READ,

FILE_SHARE_READ,

NULL,

OPEN_EXISTING,

FILE_ATTRIBUTE_NORMAL,

NULL);

if(hFile == INVALID_HANDLE_VALUE)

return NULL;

//读位图文件头

BITMAPFILEHEADER bmpFileHeader;

DWORD dwNumberOfBytesRead;

if(ReadFile(hFile, (LPVOID)&bmpFileHeader, sizeof(BITMAPFILEHEADER), &dwNumberOfBytesRead, NULL) == 0)

{

CloseHandle(hFile);

return NULL;

}

//读位图信息

BITMAPINFO *pBmpInfo = new BITMAPINFO;

if(ReadFile(hFile, pBmpInfo, sizeof(BITMAPINFOHEADER), &dwNumberOfBytesRead, NULL) == 0)

{

CloseHandle(hFile);

return NULL;

}

//读位图数据

LPVOID pBmpData;

//创建DIB位图句柄

hBmp = CreateDIBSection(hDC, pBmpInfo, DIB_PAL_COLORS, &pBmpData, NULL, 0);

if(hBmp == NULL)

{

DWORD dwErr = GetLastError();

return NULL;

}

else //读位图数据

if(ReadFile(hFile, pBmpData, pBmpInfo->bmiHeader.biSizeImage, &dwNumberOfBytesRead, NULL) == 0)

{

CloseHandle(hFile);

return NULL;

}

CloseHandle(hFile);

return hBmp;

}

//下面的代码是把一张位图保存于文件中,参考MSDN

PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)

{

BITMAP bmp;

PBITMAPINFO pbmi;

WORD cClrBits;

// Retrieve the bitmap's color format, width, and height.

if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))

return NULL;

// Convert the color format to a count of bits.

cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);

if (cClrBits == 1)

cClrBits = 1;

else if (cClrBits <= 4)

cClrBits = 4;

else if (cClrBits <= 8)

cClrBits = 8;

else if (cClrBits <= 16)

cClrBits = 16;

else if (cClrBits <= 24)

cClrBits = 24;

else cClrBits = 32;

// Allocate memory for the BITMAPINFO structure. (This structure

// contains a BITMAPINFOHEADER structure and an array of RGBQUAD

// data structures.)

if (cClrBits != 24)

pbmi = (PBITMAPINFO) LocalAlloc(LPTR,

sizeof(BITMAPINFOHEADER) +

sizeof(RGBQUAD) * (1<< cClrBits));

// There is no RGBQUAD array for the 24-bit-per-pixel format.

else

pbmi = (PBITMAPINFO) LocalAlloc(LPTR,

sizeof(BITMAPINFOHEADER));

// Initialize the fields in the BITMAPINFO structure.

pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

pbmi->bmiHeader.biWidth = bmp.bmWidth;

pbmi->bmiHeader.biHeight = bmp.bmHeight;

pbmi->bmiHeader.biPlanes = bmp.bmPlanes;

pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;

if (cClrBits < 24)

pbmi->bmiHeader.biClrUsed = (1<<cClrBits);

// If the bitmap is not compressed, set the BI_RGB flag.

pbmi->bmiHeader.biCompression = BI_RGB;

// Compute the number of bytes in the array of color

// indices and store the result in biSizeImage.

// For Windows NT/2000, the width must be DWORD aligned unless

// the bitmap is RLE compressed. This example shows this.

// For Windows 95/98, the width must be WORD aligned unless the

// bitmap is RLE compressed.

pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8

* pbmi->bmiHeader.biHeight;

// Set biClrImportant to 0, indicating that all of the

// device colors are important.

pbmi->bmiHeader.biClrImportant = 0;

return pbmi;

}

void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,

HBITMAP hBMP, HDC hDC)

{

HANDLE hf; // file handle

BITMAPFILEHEADER hdr; // bitmap file-header

PBITMAPINFOHEADER pbih; // bitmap info-header

LPBYTE lpBits; // memory pointer

DWORD dwTotal; // total count of bytes

DWORD cb; // incremental count of bytes

BYTE *hp; // byte pointer

DWORD dwTmp;

pbih = (PBITMAPINFOHEADER) pbi;

lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

if (!lpBits)

return ;

// Retrieve the color table (RGBQUAD array) and the bits

// (array of palette indices) from the DIB.

if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,

DIB_RGB_COLORS))

{

return ;

}

// Create the .BMP file.

hf = CreateFile(pszFile,

GENERIC_READ | GENERIC_WRITE,

(DWORD) 0,

NULL,

CREATE_ALWAYS,

FILE_ATTRIBUTE_NORMAL,

(HANDLE) NULL);

if (hf == INVALID_HANDLE_VALUE)

return ;

hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"

// Compute the size of the entire file.

hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +

pbih->biSize + pbih->biClrUsed

* sizeof(RGBQUAD) + pbih->biSizeImage);

hdr.bfReserved1 = 0;

hdr.bfReserved2 = 0;

// Compute the offset to the array of color indices.

hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +

pbih->biSize + pbih->biClrUsed

* sizeof (RGBQUAD);

// Copy the BITMAPFILEHEADER into the .BMP file.

if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),

(LPDWORD) &dwTmp, NULL))

{

return ;

}

// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.

if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)

+ pbih->biClrUsed * sizeof (RGBQUAD),

(LPDWORD) &dwTmp, ( NULL)))

return ;

// Copy the array of color indices into the .BMP file.

dwTotal = cb = pbih->biSizeImage;

hp = lpBits;

if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))

return ;

// Close the .BMP file.

if (!CloseHandle(hf))

return ;

GlobalFree((HGLOBAL)lpBits);

}

void CTextOnbmpDlg::OnButton1()

{

// TODO: Add your control notification handler code here

// TODO: Add your control notification handler code here

HDC hDC = ::GetDC(GetSafeHwnd());

HDC hMemDC = CreateCompatibleDC(hDC);

//打开位图文件

HBITMAP hBmp = OpenBmpFile(hDC, "d:\\temp\\6370烧写\\6484884.bmp");

SelectObject(hMemDC, hBmp);

//在位图上写字

RECT rect = {50, 50, 200, 200};

SetBkMode(hMemDC, TRANSPARENT);

DrawText(hMemDC, "你好", -1, &rect, DT_VCENTER);

//保存位图到文件

PBITMAPINFO pBmpInfo = CreateBitmapInfoStruct(GetSafeHwnd(), hBmp);

CreateBMPFile(GetSafeHwnd(), "Test.bmp", pBmpInfo, hBmp, hDC);

DeleteDC(hMemDC);

DeleteObject(hBmp);

}