![]() ![]() To avoid this, you must synchronize all concurrent calls from more than one thread to this function. Therefore, calls from more than one thread to this function will likely result in unexpected behavior or memory corruption. Any user of this function is encouraged to make sure that a valid executable image is being passed.Īll ImageHlp functions, such as this one, are single threaded. Passing a Filename parameter that does not point to a valid executable image will produce unpredictable results. It is the caller's responsibility to place the newly computed checksum into the mapped image and update the on-disk image of the file. It is recommended that all images have valid checksums. For more details, see your linker documentation. This requires new checksums to be established after the migration which become the way of checking data integrity of the new file going forward. The linker computes the original checksum at link time, if you use the appropriate linker switch. Checksums are required for kernel-mode drivers and some system DLLs. This function is used by any application that creates or modifies an executable image. MapFileAndCheckSum function computes a new checksum for the file and returns it in the CheckSum parameter. Here a specified algorithm can be used, such as MD5: certutil -hashfile .![]() This command line offers a switch, Hashfile, thanks to this, a hash string can be generated. ![]() Return code/valueĬould not convert the file name to Unicode. A command line tool is built-in in the Microsoft Windows 10 operating system, as a certificate service, which is CertUtil. If the function fails, the return value is one of the following. If the function succeeds, the return value is CHECKSUM_SUCCESS (0). The file name of the file for which the checksum is to be computed.Ī pointer to a variable that receives the original checksum from the image file, or zero if there is an error.Ī pointer to a variable that receives the computed checksum. Syntax DWORD IMAGEAPI MapFileAndCheckSumA( Computes the checksum of the specified file. ![]()
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