C++ (Cpp) Doc::LoadingFailed示例

// this is to compare the time it takes to layout a whole ebook file
// using different text measurement method (since the time is mostly
// dominated by text measure)
void BenchEbookLayout(const WCHAR *filePath) {
    bool deleteLog = false;
    if (!gLog) {
        gLog = new slog::StderrLogger();
        deleteLog = true;
    }
    logbench(L"Starting: %s", filePath);
    if (!file::Exists(filePath)) {
        logbench(L"Error: file doesn't exist");
        return;
    }
    if (!Doc::IsSupportedFile(filePath)) {
        logbench(L"Error: not an ebook file");
        return;
    }
    Timer t;
    Doc doc = Doc::CreateFromFile(filePath);
    if (doc.LoadingFailed()) {
        logbench(L"Error: failed to load the file as doc");
        doc.Delete();
        return;
    }
    double timeMs = t.Stop();
    logbench(L"load: %.2f ms", timeMs);

    int nPages = TimeOneMethod(doc, TextRenderMethodGdi,          L"gdi       ");
    TimeOneMethod(doc, TextRenderMethodGdiplus,      L"gdi+      ");
    TimeOneMethod(doc, TextRenderMethodGdiplusQuick, L"gdi+ quick");

    // do it twice because the first run is very unfair to the first version that runs
    // (probably because of font caching)
    TimeOneMethod(doc, TextRenderMethodGdi,          L"gdi       ");
    TimeOneMethod(doc, TextRenderMethodGdiplus,      L"gdi+      ");
    TimeOneMethod(doc, TextRenderMethodGdiplusQuick, L"gdi+ quick");

    doc.Delete();

    logbench(L"pages: %d", nPages);
    if (deleteLog) {
        delete gLog;
    }
}