Question

我有问题当我在多个页面上传pdf文件时，会多次生成拇指。

我的代码在

之下

var image = random() + '.png';
imagename = 'uploads/document_thumb/' + image;
var pathToFile = path.join(__dirname, req.files[i].path)
, pathToSnapshot = path.join(__dirname, '/uploads/document_thumb/' + image);

    im.resize({
            srcPath: pathToFile
        , dstPath: pathToSnapshot
        , width: 150
        , height: 150
        , quality: 0
        , gravity: "North"
    }, 
   function (err, stdout, stderr) {
    if (err) {
                    console.log(err);
            }
    console.log('resized image', pathToSnapshot);
    });

如何设置只生成一个页面拇指生成。

Answer 1

我使用GraphicsMagick生成Pdf文件的缩略图。

#include <iostream>

namespace A {
    namespace B {
        struct C {
            struct D {
                int e;  // variable e lifetime is same with struct D lifetime. Available only within struct D initialized
                D() : e(42) {}
            } d;    // variable d lifetime is samw with C struct lifetime. Available only within struct C initialized
            C() {}
            C(int v) {
                d.e = v;
            }
        } c;    // variable c lifetime is entire program. Scope is A::B::c
    }
}

int main() {
    // access variable with program lifetime in A::B namespace
    std::cout << A::B::c.d.e << std::endl;

    // create local variable of type A::B::C and access its fields
    A::B::C myc(55);
    std::cout << myc.d.e << std::endl;

    // declare struct F within main function scope and access its fields
    struct F {
        int g;
        F(int v) : g(v) { }
    } f (100);
    std::cout << f.g << std::endl;

    return 0;
}

如何在节点js中仅生成第一页的thumb pdf文件

1 个答案: