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WinHTTP component.
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procedure Resume;
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The Resume method used to resume downloading of data to some file specified in the OutputFileName property.
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After calling of this method, the component determinates the size of file specified in the OutputFileName, and initiates downloading of the rest of broken or paused download, to append the rest of data to the end of local file.
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In case if compared data are equal it continue downloading and append downloaded data to the end of local file. Otherwise it assume that file which beging downloaded has been changed, and starts download from beginning.
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By default TransferBufferSize = 4Kb, so every time when you call Resume method, the component download 4Kb of extra "rollback" data to check file consistancy.
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OutputFileName, CacheOptions and TransferBufferSize properties;
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Read, Pause and Abort methods.
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