ImageGear for C and C++ on Windows v19.0
IG_fltr_pageinfo_get_ex_W

This function obtains information about the page specified by the nPage parameter from a named multi-page file without actually loading it.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_fltr_pageinfo_get_ex_W(
   const LPAT_WCHAR lpwszFileName,
   UINT nPage,
   LPAT_MODE lpFileType,
   LPAT_MODE lpCompression,
   HIGDIBINFO* lphDIB
);

Arguments:

Name Type Description
lpwszFileName const LPAT_WCHAR Path and name of the file about which to get the information, specified as a wide string (UTF-16). The path can be absolute or relative.
nPage UINT Number of the page in a multi-page file for which to get information.
lpFileType LPAT_MODE Pointer to an AT_MODE variable in which the file type will be returned. See enumIGFormats for possible values.
lpCompression LPAT_MODE Pointer to an AT_MODE variable in which compression type will be returned. See enumIGCompressions for possible values.
lphDIB HIGDIBINFO* Pointer to HIGDIBINFO object to which other file information, such as width, height, Bits Per Pixel, etc. will be returned.

Return Value:

Returns 0 if successful. Otherwise, returns the number of ImageGear errors that occurred during this function call.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.

Sample:

GUI Windows

Example:

 
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AT_ERRCOUNT nErrCount;
AT_MODE fileType;
AT_MODE compression;
HIGDIBINFO hDIB;

nErrCount = IG_fltr_pageinfo_get_ex_W(L"picture.tif", 1,
    &fileType, &compression, &hDIB);
if(nErrCount == 0)
{
    // ...
    // Delete DIB info
    IG_DIB_info_delete(hDIB);
}

Remarks:

Any of the output parameters such as lpFileType, lpCompression, or lphDIB can be NULL, if the corresponding info is not required.

See also the "Getting Information about a Format Filter" section in Loading and Saving.

This function may work slower on PDF and PostScript images, compared to its ANSI analog IG_fltr_pageinfo_get_ex.

 

 


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