100分求救！jpeg error #52 是什么错误？怎么解决？？？？(100分)

把Stream中的图像数据放入JpegImage中，JPEGImage.LoadFromStream(MyStream);
为什么老是出现jpeg error #52 的错误？怎么解决？？？？
急死了！！

你的流处理有问题啊，检查代码，可能有数据没有接受完全

执行JPEGImage.LoadFromStream(MyStream);之前是否有
MyStream.Position :=0; ?

这是常见的jpg错误：
unit JpegErrors;

interface

const
cstrJVERSION = '6a 7-Feb-96';
cstrJCOPYRIGHT = 'Copyright (C) 1996, Thomas G. Lane';
JMSG_STR_PARM_MAX = 80; // defined in jpeg.pas, copied here

cstrJMSG_NOMESSAGE = 'Bogus message code %d'; (* Must be first entry! *)
(* For maintenance convenience, list is alphabetical by message code name *)
cstrJERR_ARITH_NOTIMPL = 'Sorry, there are legal restrictions on arithmetic coding';
cstrJERR_BAD_ALIGN_TYPE = 'ALIGN_TYPE is wrong, please fix';
cstrJERR_BAD_ALLOC_CHUNK = 'MAX_ALLOC_CHUNK is wrong, please fix';
cstrJERR_BAD_BUFFER_MODE = 'Bogus buffer control mode';
cstrJERR_BAD_COMPONENT_ID = 'Invalid component ID %d in SOS';
cstrJERR_BAD_DCTSIZE = 'IDCT output block size %d not supported';
cstrJERR_BAD_IN_COLORSPACE = 'Bogus input colorspace';
cstrJERR_BAD_J_COLORSPACE = 'Bogus JPEG colorspace';
cstrJERR_BAD_LENGTH = 'Bogus marker length';
cstrJERR_BAD_LIB_VERSION
= 'Wrong JPEG library version: library is %d, caller expects %d';
cstrJERR_BAD_MCU_SIZE = 'Sampling factors too large for interleaved scan';
cstrJERR_BAD_POOL_ID = 'Invalid memory pool code %d';
cstrJERR_BAD_PRECISION = 'Unsupported JPEG data precision %d';
cstrJERR_BAD_PROGRESSION
= 'Invalid progressive parameters Ss=%d Se=%d Ah=%d Al=%d';
cstrJERR_BAD_PROG_SCRIPT
= 'Invalid progressive parameters at scan script entry %d';
cstrJERR_BAD_SAMPLING = 'Bogus sampling factors';
cstrJERR_BAD_SCAN_SCRIPT = 'Invalid scan script at entry %d';
cstrJERR_BAD_STATE = 'Improper call to JPEG library in state %d';
cstrJERR_BAD_STRUCT_SIZE
= 'JPEG parameter struct mismatch: library thinks size is %u, caller expects %u';
cstrJERR_BAD_VIRTUAL_ACCESS = 'Bogus virtual array access';
cstrJERR_BUFFER_SIZE = 'Buffer passed to JPEG library is too small';
cstrJERR_CANT_SUSPEND = 'Suspension not allowed here';
cstrJERR_CCIR601_NOTIMPL = 'CCIR601 sampling not implemented yet';
cstrJERR_COMPONENT_COUNT = 'Too many color components: %d, max %d';
cstrJERR_CONVERSION_NOTIMPL = 'Unsupported color conversion request';
cstrJERR_DAC_INDEX = 'Bogus DAC index %d';
cstrJERR_DAC_VALUE = 'Bogus DAC value 0x%x';
cstrJERR_DHT_COUNTS = 'Bogus DHT counts';
cstrJERR_DHT_INDEX = 'Bogus DHT index %d';
cstrJERR_DQT_INDEX = 'Bogus DQT index %d';
cstrJERR_EMPTY_IMAGE = 'Empty JPEG image (DNL not supported)';
cstrJERR_EMS_READ = 'Read from EMS failed';
cstrJERR_EMS_WRITE = 'Write to EMS failed';
cstrJERR_EOI_EXPECTED = 'Didn''t expect more than one scan';
cstrJERR_FILE_READ = 'Input file read error';
cstrJERR_FILE_WRITE = 'Output file write error --- out of disk space?';
cstrJERR_FRACT_SAMPLE_NOTIMPL = 'Fractional sampling not implemented yet';
cstrJERR_HUFF_CLEN_OVERFLOW = 'Huffman code size table overflow';
cstrJERR_HUFF_MISSING_CODE = 'Missing Huffman code table entry';
cstrJERR_IMAGE_TOO_BIG = 'Maximum supported image dimension is %u pixels';
cstrJERR_INPUT_EMPTY = 'Empty input file';
cstrJERR_INPUT_EOF = 'Premature end of input file';
cstrJERR_MISMATCHED_QUANT_TABLE
= 'Cannot transcode due to multiple use of quantization table %d';
cstrJERR_MISSING_DATA = 'Scan script does not transmit all data';
cstrJERR_MODE_CHANGE = 'Invalid color quantization mode change';
cstrJERR_NOTIMPL = 'Not implemented yet';
cstrJERR_NOT_COMPILED = 'Requested feature was omitted at compile time';
cstrJERR_NO_BACKING_STORE = 'Backing store not supported';
cstrJERR_NO_HUFF_TABLE = 'Huffman table 0x%02x was not defined';
cstrJERR_NO_IMAGE = 'JPEG datastream contains no image';
cstrJERR_NO_QUANT_TABLE = 'Quantization table 0x%02x was not defined';
cstrJERR_NO_SOI = 'Not a JPEG file: starts with 0x%02x 0x%02x';
cstrJERR_OUT_OF_MEMORY = 'Insufficient memory (case %d)';
cstrJERR_QUANT_COMPONENTS
= 'Cannot quantize more than %d color components';
cstrJERR_QUANT_FEW_COLORS = 'Cannot quantize to fewer than %d colors';
cstrJERR_QUANT_MANY_COLORS = 'Cannot quantize to more than %d colors';
cstrJERR_SOF_DUPLICATE = 'Invalid JPEG file structure: two SOF markers';
cstrJERR_SOF_NO_SOS = 'Invalid JPEG file structure: missing SOS marker';
cstrJERR_SOF_UNSUPPORTED = 'Unsupported JPEG process: SOF type 0x%02x';
cstrJERR_SOI_DUPLICATE = 'Invalid JPEG file structure: two SOI markers';
cstrJERR_SOS_NO_SOF = 'Invalid JPEG file structure: SOS before SOF';
cstrJERR_TFILE_CREATE = 'Failed to create temporary file %s';
cstrJERR_TFILE_READ = 'Read failed on temporary file';
cstrJERR_TFILE_SEEK = 'Seek failed on temporary file';
cstrJERR_TFILE_WRITE
= 'Write failed on temporary file --- out of disk space?';
cstrJERR_TOO_LITTLE_DATA = 'Application transferred too few scanlines';
cstrJERR_UNKNOWN_MARKER = 'Unsupported marker type 0x%02x';
cstrJERR_VIRTUAL_BUG = 'Virtual array controller messed up';
cstrJERR_WIDTH_OVERFLOW = 'Image too wide for this implementation';
cstrJERR_XMS_READ = 'Read from XMS failed';
cstrJERR_XMS_WRITE = 'Write to XMS failed';
cstrJMSG_COPYRIGHT = cstrJCOPYRIGHT;
cstrJMSG_VERSION = cstrJVERSION;
cstrJTRC_16BIT_TABLES
= 'Caution: quantization tables are too coarse for baseline JPEG';
cstrJTRC_ADOBE
= 'Adobe APP14 marker: version %d, flags 0x%04x 0x%04x, transform %d';
cstrJTRC_APP0 = 'Unknown APP0 marker (not JFIF), length %u';
cstrJTRC_APP14 = 'Unknown APP14 marker (not Adobe), length %u';
cstrJTRC_DAC = 'Define Arithmetic Table 0x%02x: 0x%02x';
cstrJTRC_DHT = 'Define Huffman Table 0x%02x';
cstrJTRC_DQT = 'Define Quantization Table %d precision %d';
cstrJTRC_DRI = 'Define Restart Interval %u';
cstrJTRC_EMS_CLOSE = 'Freed EMS handle %u';
cstrJTRC_EMS_OPEN = 'Obtained EMS handle %u';
cstrJTRC_EOI = 'End Of Image';
cstrJTRC_HUFFBITS = ' %3d %3d %3d %3d %3d %3d %3d %3d';
cstrJTRC_JFIF = 'JFIF APP0 marker, density %dx%d %d';
cstrJTRC_JFIF_BADTHUMBNAILSIZE
= 'Warning: thumbnail image size does not match data length %u';
cstrJTRC_JFIF_MINOR = 'Unknown JFIF minor revision number %d.%02d';
cstrJTRC_JFIF_THUMBNAIL = ' with %d x %d thumbnail image';
cstrJTRC_MISC_MARKER = 'Skipping marker 0x%02x, length %u';
cstrJTRC_PARMLESS_MARKER = 'Unexpected marker 0x%02x';
cstrJTRC_QUANTVALS = ' %4u %4u %4u %4u %4u %4u %4u %4u';
cstrJTRC_QUANT_3_NCOLORS = 'Quantizing to %d = %d*%d*%d colors';
cstrJTRC_QUANT_NCOLORS = 'Quantizing to %d colors';
cstrJTRC_QUANT_SELECTED = 'Selected %d colors for quantization';
cstrJTRC_RECOVERY_ACTION = 'At marker 0x%02x, recovery action %d';
cstrJTRC_RST = 'RST%d';
cstrJTRC_SMOOTH_NOTIMPL
= 'Smoothing not supported with nonstandard sampling ratios';
cstrJTRC_SOF = 'Start Of Frame 0x%02x: width=%u, height=%u, components=%d';
cstrJTRC_SOF_COMPONENT = ' Component %d: %dhx%dv q=%d';
cstrJTRC_SOI = 'Start of Image';
cstrJTRC_SOS = 'Start Of Scan: %d components';
cstrJTRC_SOS_COMPONENT = ' Component %d: dc=%d ac=%d';
cstrJTRC_SOS_PARAMS = ' Ss=%d, Se=%d, Ah=%d, Al=%d';
cstrJTRC_TFILE_CLOSE = 'Closed temporary file %s';
cstrJTRC_TFILE_OPEN = 'Opened temporary file %s';
cstrJTRC_UNKNOWN_IDS
= 'Unrecognized component IDs %d %d %d, assuming YCbCr';
cstrJTRC_XMS_CLOSE = 'Freed XMS handle %u';
cstrJTRC_XMS_OPEN = 'Obtained XMS handle %u';
cstrJWRN_ADOBE_XFORM = 'Unknown Adobe color transform code %d';
cstrJWRN_BOGUS_PROGRESSION
= 'Inconsistent progression sequence for component %d coefficient %d';
cstrJWRN_EXTRANEOUS_DATA
= 'Corrupt JPEG data: %u extraneous bytes before marker 0x%02x';
cstrJWRN_HIT_MARKER = 'Corrupt JPEG data: premature end of data segment';
cstrJWRN_HUFF_BAD_CODE = 'Corrupt JPEG data: bad Huffman code';
cstrJWRN_JFIF_MAJOR = 'Warning: unknown JFIF revision number %d.%02d';
cstrJWRN_JPEG_EOF = 'Premature end of JPEG file';
cstrJWRN_MUST_RESYNC
= 'Corrupt JPEG data: found marker 0x%02x instead of RST%d';
cstrJWRN_NOT_SEQUENTIAL = 'Invalid SOS parameters for sequential JPEG';
cstrJWRN_TOO_MUCH_DATA = 'Application transferred too many scanlines';

const
cJpegErrors: array[0..119] of string[JMSG_STR_PARM_MAX] =
(
cstrJMSG_NOMESSAGE,
cstrJERR_ARITH_NOTIMPL,
cstrJERR_BAD_ALIGN_TYPE,
cstrJERR_BAD_ALLOC_CHUNK,
cstrJERR_BAD_BUFFER_MODE,
cstrJERR_BAD_COMPONENT_ID,
cstrJERR_BAD_DCTSIZE,
cstrJERR_BAD_IN_COLORSPACE,
cstrJERR_BAD_J_COLORSPACE,
cstrJERR_BAD_LENGTH,
cstrJERR_BAD_LIB_VERSION,
cstrJERR_BAD_MCU_SIZE,
cstrJERR_BAD_POOL_ID,
cstrJERR_BAD_PRECISION,
cstrJERR_BAD_PROGRESSION,
cstrJERR_BAD_PROG_SCRIPT,
cstrJERR_BAD_SAMPLING,
cstrJERR_BAD_SCAN_SCRIPT,
cstrJERR_BAD_STATE,
cstrJERR_BAD_STRUCT_SIZE,
cstrJERR_BAD_VIRTUAL_ACCESS,
cstrJERR_BUFFER_SIZE,
cstrJERR_CANT_SUSPEND,
cstrJERR_CCIR601_NOTIMPL,
cstrJERR_COMPONENT_COUNT,
cstrJERR_CONVERSION_NOTIMPL,
cstrJERR_DAC_INDEX,
cstrJERR_DAC_VALUE,
cstrJERR_DHT_COUNTS,
cstrJERR_DHT_INDEX,
cstrJERR_DQT_INDEX,
cstrJERR_EMPTY_IMAGE,
cstrJERR_EMS_READ,
cstrJERR_EMS_WRITE,
cstrJERR_EOI_EXPECTED,
cstrJERR_FILE_READ,
cstrJERR_FILE_WRITE,
cstrJERR_FRACT_SAMPLE_NOTIMPL,
cstrJERR_HUFF_CLEN_OVERFLOW,
cstrJERR_HUFF_MISSING_CODE,
cstrJERR_IMAGE_TOO_BIG,
cstrJERR_INPUT_EMPTY,
cstrJERR_INPUT_EOF,
cstrJERR_MISMATCHED_QUANT_TABLE,
cstrJERR_MISSING_DATA,
cstrJERR_MODE_CHANGE,
cstrJERR_NOTIMPL,
cstrJERR_NOT_COMPILED,
cstrJERR_NO_BACKING_STORE,
cstrJERR_NO_HUFF_TABLE,
cstrJERR_NO_IMAGE,
cstrJERR_NO_QUANT_TABLE,
cstrJERR_NO_SOI,
cstrJERR_OUT_OF_MEMORY,
cstrJERR_QUANT_COMPONENTS,
cstrJERR_QUANT_FEW_COLORS,
cstrJERR_QUANT_MANY_COLORS,
cstrJERR_SOF_DUPLICATE,
cstrJERR_SOF_NO_SOS,
cstrJERR_SOF_UNSUPPORTED,
cstrJERR_SOI_DUPLICATE,
cstrJERR_SOS_NO_SOF,
cstrJERR_TFILE_CREATE,
cstrJERR_TFILE_READ,
cstrJERR_TFILE_SEEK,
cstrJERR_TFILE_WRITE,
cstrJERR_TOO_LITTLE_DATA,
cstrJERR_UNKNOWN_MARKER,
cstrJERR_VIRTUAL_BUG,
cstrJERR_WIDTH_OVERFLOW,
cstrJERR_XMS_READ,
cstrJERR_XMS_WRITE,
cstrJMSG_COPYRIGHT,
cstrJMSG_VERSION,
cstrJTRC_16BIT_TABLES,
cstrJTRC_ADOBE,
cstrJTRC_APP0,
cstrJTRC_APP14,
cstrJTRC_DAC,
cstrJTRC_DHT,
cstrJTRC_DQT,
cstrJTRC_DRI,
cstrJTRC_EMS_CLOSE,
cstrJTRC_EMS_OPEN,
cstrJTRC_EOI,
cstrJTRC_HUFFBITS,
cstrJTRC_JFIF,
cstrJTRC_JFIF_BADTHUMBNAILSIZE,
cstrJTRC_JFIF_MINOR,
cstrJTRC_JFIF_THUMBNAIL,
cstrJTRC_MISC_MARKER,
cstrJTRC_PARMLESS_MARKER,
cstrJTRC_QUANTVALS,
cstrJTRC_QUANT_3_NCOLORS,
cstrJTRC_QUANT_NCOLORS,
cstrJTRC_QUANT_SELECTED,
cstrJTRC_RECOVERY_ACTION,
cstrJTRC_RST,
cstrJTRC_SMOOTH_NOTIMPL,
cstrJTRC_SOF,
cstrJTRC_SOF_COMPONENT,
cstrJTRC_SOI,
cstrJTRC_SOS,
cstrJTRC_SOS_COMPONENT,
cstrJTRC_SOS_PARAMS,
cstrJTRC_TFILE_CLOSE,
cstrJTRC_TFILE_OPEN,
cstrJTRC_UNKNOWN_IDS,
cstrJTRC_XMS_CLOSE,
cstrJTRC_XMS_OPEN,
cstrJWRN_ADOBE_XFORM,
cstrJWRN_BOGUS_PROGRESSION,
cstrJWRN_EXTRANEOUS_DATA,
cstrJWRN_HIT_MARKER,
cstrJWRN_HUFF_BAD_CODE,
cstrJWRN_JFIF_MAJOR,
cstrJWRN_JPEG_EOF,
cstrJWRN_MUST_RESYNC,
cstrJWRN_NOT_SEQUENTIAL,
cstrJWRN_TOO_MUCH_DATA
);


implementation

end.