QT5.14: 打开文件出错warning: format '%s' expects argument of type 'char*'
错误提示信息:
D:\Demo\QT5.14\CH5\CH501\imgprocessor.cpp:158: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'QChar*' [-Wformat=]
printf("file Name:%s\n",filename.data());
原函数代码:
void ImgProcessor::loadFile(QString filename) { printf("file Name:%s\n", filename.data()); QFile file(filename); if(file.open(QIODevice::ReadOnly|QIODevice::Text)){ QTextStream textStream(&file); while(!textStream.atEnd()){ showWidget->text->append(textStream.readLine()); printf("read line\n"); } printf("end\n"); } }
修改后,没有提示:
void ImgProcessor::loadFile(QString filename) { printf("file Name:%s\n", (char*)filename.data()); QFile file(filename); if(file.open(QIODevice::ReadOnly|QIODevice::Text)){ QTextStream textStream(&file); while(!textStream.atEnd()){ showWidget->text->append(textStream.readLine()); printf("read line\n"); } printf("end\n"); } }
主要修改句:
printf("file Name:%s\n", (char*)filename.data());
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