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游戏币网站怎么做,seo实战培训课程,aspcms分类信息网站,免费外国黄色网站今日我想给给图像的exif属性里面增加一个SoftWare属性，毋庸置疑，最终是失败而告终。在SDk上面纠缠了半日，直奔核心代码而去，最终无功而返。问题的症结其实跟前几日差不多，修改xmp信息可以，但是修改exif信息…

今日我想给给图像的exif属性里面增加一个SoftWare属性，毋庸置疑，最终是失败而告终。在SDk上面纠缠了半日，直奔核心代码而去，最终无功而返。问题的症结其实跟前几日差不多，修改xmp信息可以，但是修改exif信息，就得付出惨痛的代价，不断的调试...跟踪...调试...跟踪，问题点是跟踪出来了，在函数ExportTIFF_StandardMappings里面

static void
ExportTIFF_StandardMappings ( XMP_Uns8 ifd, TIFF_Manager * tiff, const SXMPMeta & xmp )
{const bool nativeEndian = tiff->IsNativeEndian();TIFF_Manager::TagInfo tagInfo;std::string xmpValue;XMP_OptionBits xmpForm;const TIFF_MappingToXMP * mappings = 0;if ( ifd == kTIFF_PrimaryIFD ) {mappings = sPrimaryIFDMappings;} else if ( ifd == kTIFF_ExifIFD ) {mappings = sExifIFDMappings;} else if ( ifd == kTIFF_GPSInfoIFD ) {mappings = sGPSInfoIFDMappings;} else {XMP_Throw ( "Invalid IFD for standard mappings", kXMPErr_InternalFailure );}for ( size_t i = 0; mappings[i].id != 0xFFFF; ++i ) {try {	// Don't let errors with one stop the others.const TIFF_MappingToXMP & mapInfo =  mappings[i];if ( mapInfo.exportMode == kExport_Never ) continue;if ( mapInfo.name[0] == 0 ) continue;	// Skip special mappings, handled higher up.bool haveTIFF = tiff->GetTag ( ifd, mapInfo.id, &tagInfo );if ( haveTIFF && (mapInfo.exportMode == kExport_InjectOnly) ) continue;{bool haveXMP = xmp.GetProperty(mapInfo.ns, mapInfo.name, &xmpValue, &xmpForm);if (!haveXMP) {if (haveTIFF && (mapInfo.exportMode == kExport_Always)) tiff->DeleteTag(ifd, mapInfo.id);}else {XMP_Assert(tagInfo.type != kTIFF_UndefinedType);	// These must have a special mapping.if (tagInfo.type == kTIFF_UndefinedType) continue;const bool mapSingle = ((mapInfo.count == 1) || (mapInfo.type == kTIFF_ASCIIType));if (mapSingle) {if (!XMP_PropIsSimple(xmpForm)) continue;	// ? Notify client?ExportSingleTIFF(tiff, ifd, mapInfo, nativeEndian, xmpValue);}else {if (!XMP_PropIsArray(xmpForm)) continue;	// ? Notify client?ExportArrayTIFF(tiff, ifd, mapInfo, nativeEndian, xmp, mapInfo.ns, mapInfo.name);}}}} catch ( ... ) {// Do nothing, let other imports proceed.// ? Notify client?}}}	// ExportTIFF_StandardMappings

程序首先已经从tag里面获取到了tagInfo（里面包含了exif:SoftWare信息），紧跟着就从xmp中去获取属性信息，导致的结果就是从tag获取的信息实际上没有用到。修改方案如下(红色部分为新增加内容)：

static void
ExportTIFF_StandardMappings ( XMP_Uns8 ifd, TIFF_Manager * tiff, const SXMPMeta & xmp )
{
   const bool nativeEndian = tiff->IsNativeEndian();
   TIFF_Manager::TagInfo tagInfo;
   std::string xmpValue;
   XMP_OptionBits xmpForm;

   const TIFF_MappingToXMP * mappings = 0;

   if ( ifd == kTIFF_PrimaryIFD ) {
       mappings = sPrimaryIFDMappings;
   } else if ( ifd == kTIFF_ExifIFD ) {
       mappings = sExifIFDMappings;
   } else if ( ifd == kTIFF_GPSInfoIFD ) {
       mappings = sGPSInfoIFDMappings;
   } else {
       XMP_Throw ( "Invalid IFD for standard mappings", kXMPErr_InternalFailure );
   }

   for ( size_t i = 0; mappings[i].id != 0xFFFF; ++i ) {

       try {   // Don't let errors with one stop the others.

           const TIFF_MappingToXMP & mapInfo = mappings[i];

           if ( mapInfo.exportMode == kExport_Never ) continue;
           if ( mapInfo.name[0] == 0 ) continue;   // Skip special mappings, handled higher up.

           bool haveTIFF = tiff->GetTag ( ifd, mapInfo.id, &tagInfo );
           if ( haveTIFF && (mapInfo.exportMode == kExport_InjectOnly) ) continue;

           if (haveTIFF){
               XMP_Assert(tagInfo.type != kTIFF_UndefinedType);   // These must have a special mapping.
               if (tagInfo.type == kTIFF_UndefinedType) continue;
               if (tagInfo.type == kTIFF_ASCIIType)
                   xmpValue = (const char*)tagInfo.dataPtr;

               ExportSingleTIFF(tiff, ifd, mapInfo, nativeEndian, xmpValue);
           }
           else {
               bool haveXMP = xmp.GetProperty(mapInfo.ns, mapInfo.name, &xmpValue, &xmpForm);
               if (!haveXMP) {

                   if (haveTIFF && (mapInfo.exportMode == kExport_Always)) tiff->DeleteTag(ifd, mapInfo.id);

               }
               else {

                   XMP_Assert(tagInfo.type != kTIFF_UndefinedType);   // These must have a special mapping.
                   if (tagInfo.type == kTIFF_UndefinedType) continue;

                   const bool mapSingle = ((mapInfo.count == 1) || (mapInfo.type == kTIFF_ASCIIType));
                   if (mapSingle) {
                       if (!XMP_PropIsSimple(xmpForm)) continue;   // ? Notify client?
                       ExportSingleTIFF(tiff, ifd, mapInfo, nativeEndian, xmpValue);
                   }
                   else {
                       if (!XMP_PropIsArray(xmpForm)) continue;   // ? Notify client?
                       ExportArrayTIFF(tiff, ifd, mapInfo, nativeEndian, xmp, mapInfo.ns, mapInfo.name);
                   }
               }
           }

       } catch ( ... ) {

           // Do nothing, let other imports proceed.
           // ? Notify client?

       }

   }

}   // ExportTIFF_StandardMappings