我试图从电子4(节点10.x)调用Win32函数,但出现一个错误,这对我来说似乎很隐蔽。
我正在使用以下代码:
import * as ffi from 'ffi';
import * as Struct from 'ref-struct';
import * as ref from "ref";
const
ABM_NEW = 0x0,
ABM_REMOVE = 0x1,
ABM_QUERYPOS = 0x2,
ABM_SETPOS = 0x3;
const RECT_Struct = new Struct({
left: ref.types.long,
top: ref.types.long,
right: ref.types.long,
bottom: ref.types.long
});
const APPBARDATA_Struct = new Struct({
cbSize: ref.types.uint32,
hWnd: ref.refType(ref.types.void),
uCallbackMessage: ref.types.uint32,
uEdge: ref.types.uint32,
rc: ref.refType(RECT_Struct),
lParam: ref.types.int64
});
export const shell32 = ffi.Library('shell32.dll', {
SHAppBarMessage: [ 'pointer', [ 'int', 'pointer']]
});
export function registerAppBar(windowHandle: any) {
let data = new APPBARDATA_Struct();
data.cbSize = APPBARDATA_Struct.size;
data.hWnd = windowHandle;
data.uCallbackMessage = 1234;
let res = shell32.SHAppBarMessage(ABM_NEW, data);
}
,然后在电子上下文中:
registerAppBar(mainWindow.getNativeWindowHandle());
我得到的错误是“ TypeError:错误设置参数1-writePointer:缓冲区实例应作为第三个参数”,我不知道为什么会发生。
我们非常感谢您的帮助/想法!
我要做的是按照https://docs.microsoft.com/en-us/windows/win32/shell/application-desktop-toolbars
注册一个电子窗口成为应用程序工具栏。答案 0 :(得分:0)
您需要传递给SHAppBarMessage
的第二个参数是指向APPBARDATA_Struct
的指针,请参见以下链接:
https://github.com/node-ffi/node-ffi/wiki/Node-FFI-Tutorial#structs
var APPBARDATA_StructPtr = ref.refType('APPBARDATA_Struct');
export const shell32 = ffi.Library('shell32.dll', {
SHAppBarMessage: [ 'pointer', [ 'int', 'APPBARDATA_StructPtr']]
});
...
let res = shell32.SHAppBarMessage(ABM_NEW, data.ref());
此外,rc
中的APPBARDATA_Struct
不是structPtr。
答案 1 :(得分:0)
使用Node ffi pointer to struct,我可以使用它来工作:
export const shell32 = ffi.Library('shell32.dll', {
SHAppBarMessage: [ 'pointer', [ 'int', APPBARDATA_Struct]]
});
与Drake Wo的评论中的建议类似,但没有”,并且未使用ref.refType。
现在函数返回true:D
答案 2 :(得分:0)
我尝试制作类似的任务栏窗口,但 ffi/ref-struct/ref 导入似乎已过时。 我尝试与 ffi-napi 一起使用,但没有任何反应(没有错误,没有)。如何使这个与电子一起工作,将电子窗口注册为任务栏,以便根据任务栏的大小展开所有其他窗口?
import * as ffi from "ffi-napi";
const ref = require("ref-napi");
const Struct = require("ref-struct-di")(ref);
const ABM_NEW = 0;
const ABM_REMOVE = 0x1;
const ABM_QUERYPOS = 0x2;
const ABM_SETPOS = 0x3;
const ABEdgeLeft = 0;
const ABEdgeTop = 1;
const ABEdgeRight = 2;
const ABEdgeBottom = 3;
const ABEdgeFloat = 4;
const RECT_Struct = Struct({
left: ref.types.long,
top: ref.types.long,
right: ref.types.long,
bottom: ref.types.long,
});
const APPBARDATA_Struct = Struct({
cbSize: ref.types.uint32,
hWnd: ref.refType(ref.types.void),
uCallbackMessage: ref.types.uint32,
uEdge: ref.types.uint32,
rc: ref.refType(RECT_Struct),
lParam: ref.types.int64,
});
export const shell32 = ffi.Library("shell32.dll", {
SHAppBarMessage: ["pointer", ["int", APPBARDATA_Struct]],
});
export function registerAppBar(windowHandle: Buffer): void {
const data = new APPBARDATA_Struct();
data.cbSize = APPBARDATA_Struct.size;
data.edge = ABEdgeLeft;
data.hWnd = windowHandle;
data.uCallbackMessage = 1234;
shell32.SHAppBarMessage(ABM_NEW, data);
}