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:

lpImage32	Pointer to start of file image in memory.
dwSize	Size of image in memory.
nPage	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	Pointer to an AT_MODE variable in which the file type will be returned. See enumIGFormats for possible values.
lpCompression	Pointer to an AT_MODE variable in which compression type will be returned. See enumIGCompressions for possible values.
lphDIB	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 Professional.

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.

ImageGear Professional DLL v17.1 for Windows
IG_info_get_mem_ex
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