C++ 获取桌面(Desktop)选中项

代码思路来源于开源项目 QuickLook,并做了简化.

开始

在VS2017 下创建C++控制台项目,在预编译头文件添加适当的include

#ifndef PCH_H
#define PCH_H

// TODO: 添加要在此处预编译的标头
#include
#include
#include
#include
#include
#include
#include
#include
#include
#endif //PCH_H

// 以上为QuickLook所添加的头文件.复制代码

创建函数定义

void GetSelectedInternernal(CComQIPtrpwba);
void ObtainFirstItem(CComPtrdao);
void getSelectedFromDesktop();复制代码

main 函数

int main()
{
	for (;;)
	{
		getSelectedFromDesktop();
		Sleep(1000);
	}
}
// 考虑到测试用途直接来个无限循环+Sleep复制代码

getSelectedFromDesktop

void getSelectedFromDesktop() {
    // 初始化
	CoInitialize(nullptr);
	CComPtrpsw;
	CComQIPtrpwba;
	// 获取 IShellWindows 实例
	if (FAILED(psw.CoCreateInstance(CLSID_ShellWindows)))
		return;
	VARIANT pvarLoc;
	VariantInit(&pvarLoc);
	long phwnd;
	// 获取 IWebBrowserApp 实例
	if (FAILED(psw->FindWindowSW(&pvarLoc, &pvarLoc, SWC_DESKTOP, &phwnd, SWFO_NEEDDISPATCH, reinterpret_cast(
		&pwba))))
		return;
	GetSelectedInternernal(pwba);
}复制代码

GetSelectedInternernal

// 层层递进取得最终的IShellView,并取出选中项(SVGIO_SELECTION)
void GetSelectedInternernal(CComQIPtrpwba) {
	CComQIPtrpsp;
	if (FAILED(pwba->QueryInterface(IID_IServiceProvider, reinterpret_cast(&psp)))) {
		return;
	}
	CComPtrpsb;
	if (FAILED(psp->QueryService(SID_STopLevelBrowser, IID_IShellBrowser, reinterpret_cast(&psb)))) {
		return;
	}
	CComPtrpsv;
	if (FAILED(psb->QueryActiveShellView(&psv))) {
		return;
	}
	CComPtrdao;
	if (FAILED(psv->GetItemObject(SVGIO_SELECTION, IID_IDataObject, reinterpret_cast(&dao)))) {
		return;
	}
	ObtainFirstItem(dao);
}复制代码

// 最终提取文件地址
void ObtainFirstItem(CComPtrdao) {
	FORMATETC formatetc;
	STGMEDIUM medium = { sizeof medium };
	formatetc.cfFormat = CF_HDROP;
	formatetc.ptd = nullptr;
	formatetc.dwAspect = DVASPECT_CONTENT;
	formatetc.lindex = -1;
	formatetc.tymed = TYMED_HGLOBAL;
	medium.tymed = TYMED_HGLOBAL;
	if (FAILED(dao->GetData(&formatetc, &medium)))
		return;
        // 获取选中数量
	int n = DragQueryFile(HDROP(medium.hGlobal), 0xFFFFFFFF, nullptr, 0);
	if (n < 1)
		return;
	WCHAR buffer[260] = { '' };
        // 选择第一个
	DragQueryFile(HDROP(medium.hGlobal), 0, buffer, MAX_PATH - 1);
	// 输出
	std::wcout << buffer << std::endl;
}
复制代码