WriteFile 返回错误 1784
我正在创建一个程序来使用虚拟文件系统填充磁盘。
目前，我正在使用 WriteFile 写入可变大小的文件。
WriteFile(hFile, FileData, i * 1024, &dwWrote, NULL);
err = GetLastError();
错误返回#1784，翻译为
提供的用户缓冲区对于请求的操作无效。 ERROR_INVALID_USER_BUFFER
因此，对于前 24 个文件，写入操作有效。对于文件 #25，写入操作失败。 文件仍会创建，但 WriteFile 函数不会填充文件。
关于如何克服ERROR_INVALID_USER_BUFFER有什么想法吗？
我能找到的所有关于该错误的参考都仅限于崩溃的程序，我无法弄清楚它与我遇到的问题有何关系。
编辑：
FileData = (char *) malloc(sizeof(char) * (size_t)k * 1024);
memset(FileData, 245, sizeof(char) * (size_t)k * 1024);
FileData 设置并分配给最大预期缓冲区的大小。 i 是迭代的循环变量，直到递增到最大大小 (k)。
I am creating a program to populate a disk with a dummy file system.
Currently, I am writing files of variable sizes using WriteFile.
WriteFile(hFile, FileData, i * 1024, &dwWrote, NULL);
err = GetLastError();
err returns #1784 which translates to
The supplied user buffer is not valid for the requested operation. ERROR_INVALID_USER_BUFFER
So for the first 24 files, the write operation works. For file #25 on, the write operation fails.
The files are still created but the WriteFile function does not populate the files.
Any ideas on how to get past ERROR_INVALID_USER_BUFFER?
Every reference I can find to the error is limited to crashing programs and I cannot figure out how it relates to the issue I am experiencing.
EDIT:
FileData = (char *) malloc(sizeof(char) * (size_t)k * 1024);
memset(FileData, 245, sizeof(char) * (size_t)k * 1024);
FileData is set and allocated to the size of the maximum anticipate buffer.
i is the loop variable that iterates until it increments to the Maximum Size (k).
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我的猜测是
FileData不够大，无法从中写入i * 1024字节。i是文件列表的循环控制变量吗？如果是这样，您需要在循环访问文件时写入缓冲区FileData一次增加 1K。这是一个不寻常的结构。你确定这里的逻辑是正确的吗？发布更多代码（特别是
FileData和i的所有用法），以提高答案的准确性。请注意，您不应该总是在此处检查
GetLastError- 您需要先检查WriteFile的返回代码，然后才能相信它有意义。否则，您可能会从代码的某些不相关部分中发现错误 - 无论最后失败的是什么。My guess is that
FileDatais not large enough for you to writei * 1024bytes from it. Isithe loop control variable for your list of files? If so, you need the write bufferFileDatato grow 1K at a time as you loop through your files.This is an unusual construct. Are you sure the logic is correct here? Post more code (specifically, all usage of
FileDataandi) for better accuracy in the answers.Note that you should not always be checking
GetLastErrorhere - you need to checkWriteFile's return code before you rely on that being meaningful. Otherwise you could be picking up an error from some unrelated part of your code - whatever failed last.我收到错误 = 1784，这是因为我在没有指定记录大小的情况下打开了文件，然后对文件进行了块读取。
应该是
I got a Error = 1784 and it was because I opened the file without specifying the size of records and then did block reads on the file.
Should be