IG_info_get_mem

This function obtains information about the image located in the memory buffer.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_info_get_mem_ex( VOID FAR32* lpImage32, AT_UINT dwSize, UINT nPage, LPAT_MODE lpFileType, LPAT_MODE lpCompression, HIGDIBINFO* lphDIB );

Arguments:

Name	Type	Description
lpImage32	VOID FAR32*	Pointer to start of file image in memory.
dwSize	AT_UINT	Size of image in memory.
nPage	UINT	Page number about which to get information, if a multi page file set to 1 or greater; for a non multi page file set to 1.
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 the compression type will be returned. See enumIGCompressions for possible values.
lphDIB	HIGDIBINFO*	Pointer to an HIGDIBINFO 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:

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

Sample:

MemIO

Example:

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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 HIGDIBINFO hDIB; 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 fclose(fp); // Get image info nErrcount = IG_info_get_mem_ex(lpBuffer, nBufferSize, 1, &nFileType, &nCompression, &hDIB); fclose(fp); // ... // Delete memory buffer free(lpBuffer); // Delete DIB info IG_DIB_info_delete(hDIB); }

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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
HIGDIBINFO hDIB;
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
    fclose(fp);
    // Get image info
    nErrcount = IG_info_get_mem_ex(lpBuffer, nBufferSize, 1, &nFileType, &nCompression, &hDIB);
    fclose(fp);

    // ...
    // Delete memory buffer
    free(lpBuffer);
    // Delete DIB info
    IG_DIB_info_delete(hDIB);
}

Remarks:

See also IG_info_get_FD_ex and IG_info_get_ex functions.