Function signature error

[miteshpandey]

Hello all,

I have the following code:

class TiffStream {

public:
    // ctor/dtor
    TiffStream();
    ~TiffStream();

public:
    enum SeekDir {
	    beg,
	    cur,
	    end,
    };

public:
    // factory methods
    TIFF* makeFileStream(std::iostream* str);
    TIFF* makeFileStream(std::ifstream* str);
    TIFF* makeFileStream(std::ofstream* str);

public:
    // tiff client methods
    static tsize_t read(thandle_t fd, tdata_t buf, tsize_t size);
    static tsize_t write(thandle_t fd, tdata_t buf, tsize_t size);
    static toff_t seek(thandle_t fd, toff_t offset, int origin);
    static toff_t size(thandle_t fd);
    static int close(thandle_t fd);
    static int map(thandle_t fd, tdata_t* phase, toff_t* psize);
    static void unmap(thandle_t fd, tdata_t base, tsize_t size);

    ..................
    ..................
};

TIFF*
TiffStream::makeFileStream(ifstream* str)
{
    m_inStream = str;
    m_outStream = NULL;
    m_ioStream = NULL;
    m_streamLength = getSize(m_this);

    m_tif =  TIFFClientOpen(m_name, 
                           "r",
			   m_this,
			   read,
			   write,
			   seek,
			   close,
			   size,
			   map,
			   unmap);
    return m_tif;
}

TIFF*
TiffStream::makeFileStream(ofstream* str)
{
	m_inStream = NULL;
        m_outStream = str;
	m_ioStream = NULL;
	m_streamLength = getSize(m_this);

	m_tif =  TIFFClientOpen(m_name, 
                           "w",
			   m_this,
			   read,
			   write,
			   seek,
			   close,
			   size,
			   map,
			   unmap);
    return m_tif;
}

TIFF*
TiffStream::makeFileStream(iostream* str)
{
    m_inStream = NULL;
    m_outStream = NULL;
    m_ioStream = str;
    m_streamLength = getSize(m_this);

    m_tif =  TIFFClientOpen(m_name, 
	                       "r+w",
	                       m_this,
			       read,
			       write,
			       seek,
			       close,
			       size,
			       map,
			       unmap);
    return m_tif;
}

The error generated is as below:

1>i:\de5.5_sdk_21_may_2008(2)\de5.5_sdk\deplugins\plugins\2d\tiffstream.cpp(45) : error C2664: 'TIFFClientOpen' : cannot convert parameter 10 from 'void (__cdecl *)(thandle_t,tdata_t,tsize_t)' to 'TIFFUnmapFileProc'
1>        None of the functions with this name in scope match the target type
1>i:\de5.5_sdk_21_may_2008(2)\de5.5_sdk\deplugins\plugins\2d\tiffstream.cpp(66) : error C2664: 'TIFFClientOpen' : cannot convert parameter 10 from 'void (__cdecl *)(thandle_t,tdata_t,tsize_t)' to 'TIFFUnmapFileProc'
1>        None of the functions with this name in scope match the target type
1>i:\de5.5_sdk_21_may_2008(2)\de5.5_sdk\deplugins\plugins\2d\tiffstream.cpp(87) : error C2664: 'TIFFClientOpen' : cannot convert parameter 10 from 'void (__cdecl *)(thandle_t,tdata_t,tsize_t)' to 'TIFFUnmapFileProc'
1>        None of the functions with this name in scope match the target type
1>Build log was saved at "file://I:\DE5.5_SDK_21_May_2008(2)\DE5.5_SDK\DE42\Temp\Win32\vc80\Debug\2d\BuildLog.htm"
1>2d - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========

#if defined(__cplusplus)
extern "C" {
#endif
typedef	void (*TIFFErrorHandler)(const char*, const char*, va_list);
typedef	tsize_t (*TIFFReadWriteProc)(thandle_t, tdata_t, tsize_t);
typedef	toff_t (*TIFFSeekProc)(thandle_t, toff_t, int);
typedef	int (*TIFFCloseProc)(thandle_t);
typedef	toff_t (*TIFFSizeProc)(thandle_t);
typedef	int (*TIFFMapFileProc)(thandle_t, tdata_t*, toff_t*);
typedef	void (*TIFFUnmapFileProc)(thandle_t, tdata_t, toff_t);
................
................
................

The following is the TIFFClientOpen function's signature

TIFF*
TIFFClientOpen(
	const char* name, const char* mode,
	thandle_t clientdata,
	TIFFReadWriteProc readproc,
	TIFFReadWriteProc writeproc,
	TIFFSeekProc seekproc,
	TIFFCloseProc closeproc,
	TIFFSizeProc sizeproc,
	TIFFMapFileProc mapproc,
	TIFFUnmapFileProc unmapproc
)

The error is generated for only the "unmap" function. Instead of a static class member function I used a free function. But still the error is there. Please help. I am stuck with this.