谁能给我个读取TIF格式图像的例子,谢谢谢谢

Question

我想点击BUTTON按钮后,选择指定图片文件,显示在对话框,应该怎么做?谢谢谢谢

Answer 1

http://www.codeguru.com/cpp/g-m/bitmap/otherformats/article.php/c4933/

Answer 2

GDI+ support tif/jpg/gif, 下面是转换的代码，可以参考#include <Stdio.h>
#include <Objbase.h>
#include <Windows.h>
#include <Gdiplus.h>
#include <GdiPlusEnums.h>
using namespace Gdiplus;
#pragma comment(lib,"gdiplus")
int GetCodecClsid(const WCHAR*, CLSID*);HRESULT __fastcall AnsiToUnicode(LPCSTR pszA, LPOLESTR* ppszW)
{
    ULONG cCharacters;
    DWORD dwError;
    if (NULL == pszA)
    {
        *ppszW = NULL;
        return NOERROR;
    }
    cCharacters =  strlen(pszA)+1;
    *ppszW = (LPOLESTR) CoTaskMemAlloc(cCharacters*2);
    if (NULL == *ppszW)
        return E_OUTOFMEMORY;
    if (0 == MultiByteToWideChar(CP_ACP, 0, pszA, cCharacters,*ppszW, cCharacters))
    {
        dwError = GetLastError();
        CoTaskMemFree(*ppszW);
        *ppszW = NULL;
        return HRESULT_FROM_WIN32(dwError);
    }
    return NOERROR;
}int main(int argc, char* argv[])
{
    int n_ret=0;
    printf("%s can convert jpg, png, gif, tiff to gif file.\n if it works, it is written by masterz, otherwise I don't know who write it\n",argv[0]);
    if(argc!=3)
    {
        printf("usage:%s gif_filename source_image_filename\n",argv[0]);
        return -1;
    }
    GdiplusStartupInput gdiplusStartupInput; 
    ULONG gdiplusToken; 
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL); 
    {
        CLSID              codecClsid;
        Status             stat;
        EncoderParameters  encoderParameters;        GetCodecClsid(L"image/gif", &codecClsid);        
        encoderParameters.Count = 0;        
        LPOLESTR bstr_src_img;
        LPOLESTR bstr_dst_fn;
        AnsiToUnicode(argv[1],&bstr_dst_fn);
        AnsiToUnicode(argv[2],&bstr_src_img);
        Image image(bstr_src_img);
        stat =image.Save(bstr_dst_fn, &codecClsid, &encoderParameters);        
        if(stat == Ok)
        {
            n_ret=0;
            wprintf(L"%s saved successfully.\n",bstr_dst_fn);
        }
        else
        {
            n_ret=-2;
            wprintf(L"%d  Attempt to save %s failed.\n", stat, bstr_dst_fn);
        }
        CoTaskMemFree(bstr_dst_fn);
        CoTaskMemFree(bstr_src_img);
    }
    GdiplusShutdown(gdiplusToken);
    return 0;
} 
// mainint GetCodecClsid(const WCHAR* format, CLSID* pClsid)
{
   UINT  num = 0;          // number of image encoders
   UINT  size = 0;         // size of the image encoder array in bytes   ImageCodecInfo* pImageCodecInfo = NULL;   GetImageEncodersSize(&num, &size);
   if(size == 0)
      return -1;  // Failure   pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
   if(pImageCodecInfo == NULL)
      return -1;  // Failure   GetImageEncoders(num, size, pImageCodecInfo);   for(UINT j = 0; j < num; ++j)
   {
      if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
      {
         *pClsid = pImageCodecInfo[j].Clsid;
         return j;  // Success
      }    
   } // for   return -1;  // Failure} 
// GetCodecClsid
//in order to compile this program, you need to download microsoft platform sdk from http://www.microsoft.com/msdownload/platformsdk/sdkupdate/downlevel.htm
//also download gdiplus.dll and put it at the same directory as the executable.
//http://www.microsoft.com/downloads/release.asp?releaseid=32738
//Platform SDK Redistributable: GDI+ RTM //sample usage: img2gif a.gif src.bmp

Answer 3

一般就是找到它的stripoffset的值，这个值所指向的值就是数据位置的偏移量