为什么我每次调用Bitmap::Save总是返回Status Win32Error = 7呢?
以下是程序启动的时候TRACE出来的Encoder信息
前面是Encoder名字,后面是对应的CLSID:
image/bmp:{557CF400-1A04-11D3-9A73-0000F81EF32E}
image/jpeg:{557CF401-1A04-11D3-9A73-0000F81EF32E}
image/gif:{557CF402-1A04-11D3-9A73-0000F81EF32E}
image/tiff:{557CF405-1A04-11D3-9A73-0000F81EF32E}
image/png:{557CF406-1A04-11D3-9A73-0000F81EF32E}
以下是Save的时候的TRACE信息
image/bmp:{557CF400-1A04-11D3-9A73-0000F81EF32E}
以下是Save时的代码:
Status stat = m_pSelectedImage->Save(wstrEncoder.c_str(), &clsid, NULL);
if(stat == Ok)
TRACE("Current Image was saved successfully\n");
else
TRACE("Failure: stat = %d\n", stat);
结果每次输出:
Failure: stat = 7
让我很郁闷。
以下是程序启动的时候TRACE出来的Encoder信息
前面是Encoder名字,后面是对应的CLSID:
image/bmp:{557CF400-1A04-11D3-9A73-0000F81EF32E}
image/jpeg:{557CF401-1A04-11D3-9A73-0000F81EF32E}
image/gif:{557CF402-1A04-11D3-9A73-0000F81EF32E}
image/tiff:{557CF405-1A04-11D3-9A73-0000F81EF32E}
image/png:{557CF406-1A04-11D3-9A73-0000F81EF32E}
以下是Save的时候的TRACE信息
image/bmp:{557CF400-1A04-11D3-9A73-0000F81EF32E}
以下是Save时的代码:
Status stat = m_pSelectedImage->Save(wstrEncoder.c_str(), &clsid, NULL);
if(stat == Ok)
TRACE("Current Image was saved successfully\n");
else
TRACE("Failure: stat = %d\n", stat);
结果每次输出:
Failure: stat = 7
让我很郁闷。
#include <Stdio.h>
#include <Objbase.h>
#include <Windows.h>
#include <Gdiplus.h>
#include <GdiPlusEnums.h>
using namespace Gdiplus;
#pragma comment(lib,"gdiplus")
// Helper functions
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 bmp file.\n if it works, it is written by masterz, otherwise I don't know who write it",argv[0]);
if(argc!=3)
{
printf("usage:%s bmp_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/bmp", &codecClsid);
encoderParameters.Count = 0;
LPOLESTR bstr_src_img;
LPOLESTR bstr_dst_bmp;
AnsiToUnicode(argv[1],&bstr_dst_bmp);
AnsiToUnicode(argv[2],&bstr_src_img);
Image image(bstr_src_img);
stat =image.Save(bstr_dst_bmp, &codecClsid, &encoderParameters);
if(stat == Ok)
{
n_ret=0;
wprintf(L"%s saved successfully.\n",bstr_dst_bmp);
}
else
{
n_ret=-2;
wprintf(L"%d Attempt to save %s failed.\n", stat, bstr_dst_bmp);
}
CoTaskMemFree(bstr_dst_bmp);
CoTaskMemFree(bstr_src_img);
}
GdiplusShutdown(gdiplusToken);
return 0;
} // main
int 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
//sample usage: img2bmp a.bmp b.gif