WIN32一些文件及窗口操作

0，获取指定的系统路径：

#include <shlobj.h> 
    #pragma comment(lib, "shell32.lib")

TCHAR szPath[MAX_PATH];
　　::SHGetSpecialFolderPath(NULL, szPath, CSIDL_PERSONAL, FALSE);

1，打开文件或选中文件：

BOOL OpenDownFile(const TCHAR* pFilePath, BOOL bOpenCatalogue)
{ 
    std::wstring wstrPath; 
    if (bOpenCatalogue) 
    { 
        wstrPath.append(L"/n,/select,"); 
        //打开文件所在目录，选中指定文件 
    }

wstrPath.append(pFilePath);//没有/n,/select,参数的话是直接打开指定文件或目录
　　ShellExecute(NULL, L"open", L"Explorer.exe", wstrPath.c_str(), NULL, SW_SHOWDEFAULT);

return TRUE;
}

2，文件另存为：
BOOL SaveFileAs(const
HWND hWnd, const
TCHAR* pDefaultFileName)
{
    std::wstring
FileSavePath;
    std::wstring
fileNameAll;
    std::wstring
wstrPostfix;

fileNameAll = pDefaultFileName;

    size_t
ipoint = fileNameAll.rfind(L".");
  
    if(ipoint == fileNameAll.npos)//无后缀名

    {

        wstrPostfix.clear();

    }

    else

    {

        wstrPostfix = fileNameAll.substr(ipoint+1);

    }

TCHAR
filename[MAX_PATH] = {0};

　　TCHAR
pstrFilter[MAX_PATH] = {0};

　　wsprintf(pstrFilter,L"%s Files(*.%s)|*.%s|All Files(*.*)|*.*||",wstrPostfix.c_str(),wstrPostfix.c_str(),wstrPostfix.c_str());

OPENFILENAME
ofn;

    ZeroMemory(&ofn, sizeof(ofn));

　　wcscpy_s(filename,_countof(filename),fileNameAll.c_str());
 
　  ofn.lpstrFile        = filename;
    ofn.nMaxFile        = MAX_PATH;

    ofn.lpstrFilter        = L"*.*";
  
    ofn.lpstrDefExt        = wstrPostfix.c_str();

    ofn.lpstrTitle        = L"另存为";
  
    ofn.Flags        = OFN_HIDEREADONLY | OFN_PATHMUSTEXIST;

    ofn.FlagsEx     = OFN_EX_NOPLACESBAR;

    ofn.lStructSize        = sizeof(OPENFILENAME);
    ofn.hwndOwner        = hWnd;

    ofn.hInstance        = NULL;

if (::GetSaveFileName(&ofn))

    {

        FileSavePath = filename;

    }

    else

    {

        return
FALSE;

    }

return
TRUE;

}

3，选择文件
#include
<commdlg.h>
BOOL
SelectFile(std::wstring& strSelectFile )
{

    OPENFILENAME
opfn;

    TCHAR
strFilename[MAX_PATH];

    ZeroMemory(&opfn, sizeof(OPENFILENAME));

    opfn.lStructSize = sizeof(OPENFILENAME);

    opfn.lpstrFilter = L"pdf Files(*.pdf)\0 *.pdf\0";//设置过滤

    opfn.nFilterIndex = 1;

    opfn.lpstrFile = strFilename;

    opfn.lpstrFile[0] = '\0';

    opfn.nMaxFile = sizeof(strFilename);

    opfn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;

    if (::GetOpenFileName(&opfn))

    {

        strSelectFile = strFilename;

    }

    return
TRUE;

}

4，文件拖拽

DragAcceptFiles(hWnd, TRUE);

case
WM_DROPFILES:

{
　　HDROP
hDrop = (HDROP)wParam;

　　TCHAR
szFileName[MAX_PATH];

　　int
count = DragQueryFile(hDrop, 0xFFFFFFFF, NULL, 0);
　　if(count)

　　{
　　　　for(int
i=0; i<count;i++)

        { 
　　　　　　int
pathLen = DragQueryFile(hDrop, i, szFileName,MAX_PATH);

　　　　　　//Do(szFileName);

　　　　}
　　
}

}

break;

5，透明窗口

SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(m_hwnd, GWL_EXSTYLE) ^ 0x80000);

HINSTANCE
hInst = LoadLibrary(L"User32.DLL");
 
if (hInst)

{

    typedef
BOOL(WINAPI *MYFUNC)(HWND, COLORREF, BYTE, DWORD);

    MYFUNC
fun = NULL;

    fun = (MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");

    if (fun)

        fun(hWnd, 0, 255 / 2, LWA_ALPHA); //半透明

    FreeLibrary(hInst);

}