ImageGear for C and C++ on Linux v20.0 - Updated
API Reference Guide > Core Component API Reference > Core Component Functions Reference > Info Functions > IG_info_get_mem

This function obtains information about the image located in a memory buffer. This is an obsolete function, see remarks.


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   LPVOID lpImage,
   AT_UINT nImageSize,
   UINT nPage,
   LPAT_MODE lpFileType,
   LPAT_MODE lpCompression,


Name Type Description
lpImage LPVOID Pointer to memory location of an image file that is currently in memory.
nImageSize AT_UINT Size of image in memory.
nPage UINT Page number for which the info is obtained. Note that page numbers begin at 1, not 0. Set nPage to 1 if this is not a multi-page memory file.
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.
lpDIB LPAT_DIB Pointer to an AT_DIB structure to which other file information such as width, height, and Bits Per Pixel 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:

If lpDIB is not NULL, then

otherwise, all pixel formats supported by ImageGear for C and C++.


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char* lpBuffer;            // Memory buffer with the image
AT_UINT nBufferSize;    // Size of the memory buffer
AT_MODE nFileType;        // Will receive an IG_FORMAT_ constant
AT_MODE nCompression;    // Will receive an IG_COMPRESSION_ constant
AT_ERRCOUNT nErrcount;        // Returned count of errors

// Open a file and get its size
FILE* fp = NULL;
fopen_s(&fp, "picture.bmp", "rb");
if(fp != NULL)
    fseek(fp, 0, SEEK_END);
    nBufferSize = (AT_UINT)ftell(fp);
    fseek(fp, 0, SEEK_SET);
    // Allocate memory and read the image into the memory buffer
    lpBuffer = (char*)malloc(nBufferSize);
    fread(lpBuffer, 1, nBufferSize, fp);
    // File is no longer needed - close it
    // Get image info
    nErrcount = IG_info_get_mem(lpBuffer, nBufferSize, 1, &nFileType, &nCompression, &atDIB);

    // ...
    // Delete memory buffer


This function is only kept for backward compatibility reasons. Please use IG_info_get_mem_ex instead.

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

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