qfile

I am writing a Qt program (4.7 for windows 7 initially) that requires writing to the installed directory (C:\Program Files...). No files are being created when I try to write to a location that would be "protected" (program files, C:\ etc). However, QFile is not giving me any error code (error() is returning 0 which means it worked fine). Here is a code snippit that I am using that is not working. I am closing the file its just much later in the program. QApplication a(argc, argv); // Setting plugin paths. QStringList paths = QCoreApplication::libraryPaths(); paths.append(QCoreApplication:

I'm beginning with Qt and am stuck with a problem supposedly for quite a long time now. I'm sure it's just something I don't see in C++. Anyway, please look at the following simple code and point me what am I doing wrong: typedef struct FILEHEADER { char udfSignature[8]; char fileName[64]; long fileVersion; UNIXTIME fileCreation; UNIXTIME lastRebuild; FILEPOINTER descriptor; } fileheader; QFile f("nanga.dat"); if(f.open(QIODevice::ReadWrite)); f.write(fileheader); Qt 5.2.0 trows me the following error message: C:\sw\udb\udb\main.h:113: error: no matching function for call to 'QFile::write

How can I open a QFile for appending, i.e. the equivalent of FILE *f = fopen("myfile.txt", "a"); Maciej Open the file in QIODevice::Append mode: QFile f(...); if (f.open(QIODevice::WriteOnly | QIODevice::Append)) { ... } See also the documentation . 来源： https://stackoverflow.com/questions/13856734/open-qfile-for-appending