在bmp上添加字符
//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; &n
补充：软件开发 , C++ ,
