winapi - How to use Win32 API to specify directory to write file to using WriteFile? -

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i've used following handle file:

char *filepathandname = "c:\projects\pic.bmp"; handle hfile = createfile(_t(filepathandname),generic_write, 0, null, create_always, file_attribute_normal, null);

and i've used following write file:

writefile(hfile, (lpstr)&bmfheader, sizeof(bitmapfileheader), &dwbyteswritten, null); writefile(hfile, (lpstr)&bi, sizeof(bitmapinfoheader), &dwbyteswritten, null); writefile(hfile, (lpstr)lpbitmap, dwbmpsize, &dwbyteswritten, null);

however, file writes project directory (i.e. microsoft visual studio solution file exists) rather c:\projects\ directory.

how can write .bmp file specified directory?

the _t() macro can used literals (same text() macro). , not escaping slashes in literal.

the c runtime uses _t() macro. win32 api uses text() macro. should not mix them, though same thing. use correct macro api using.

and don't need type-cast data lpstr when calling writefile().

use instead:

lptstr filepathandname = text("c:\\projects\\pic.bmp"); handle hfile = createfile(filepathandname, generic_write, 0, null, create_always, file_attribute_normal, null);  ... writefile(hfile, &bmfheader, sizeof(bitmapfileheader), &dwbyteswritten, null); writefile(hfile, &bi, sizeof(bitmapinfoheader), &dwbyteswritten, null); writefile(hfile, lpbitmap, dwbmpsize, &dwbyteswritten, null);

with said, typically should prompting user output filename, either getsavefilename() or ifilesavedialog. or @ least prompt destination folder using shbrowseforfolder() (or ifilesavedialog, supports picking folder) if want use own filename.


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