在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
k?;@5r) y-
eh;L])~C 一、实现方法
]o?r(1 f=hT
o!i 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
z'&tmje[? z 4qEC #pragma data_seg("shareddata")
_;mA(j HHOOK hHook =NULL; //钩子句柄
F*-+5nJ&@ UINT nHookCount =0; //挂接的程序数目
b6NGhkr'\ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Y[0mTL4IO static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
0[ZB ^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
j8)rz static int KeyCount =0;
xnOd$] static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
aQ*?L
l #pragma data_seg()
?0tm{qP B:96E& 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
7{lWg x ?*^HZ~O1 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
37b6w6{D 5t,X; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
VDFs.;:s cKey,UCHAR cMask)
1*f*}M {
2.
q\!V}yQ BOOL bAdded=FALSE;
l4gZHMh' for(int index=0;index<MAX_KEY;index++){
#.{ddY{ if(hCallWnd[index]==0){
kgHZaQnD hCallWnd[index]=hWnd;
?kULR0uL+ HotKey[index]=cKey;
W3gHzT?{ HotKeyMask[index]=cMask;
H=*lj.x bAdded=TRUE;
O>"T* KeyCount++;
YYhN>d$ break;
_>J`e7j+ }
ns#v?D9NF }
t|m=X return bAdded;
WD@v<Wx) }
=Eb$rc) //删除热键
ws<pBC,m BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.*B@1q {
[jR>.H' BOOL bRemoved=FALSE;
0Ibe~!EiQJ for(int index=0;index<MAX_KEY;index++){
u7SC_3R if(hCallWnd[index]==hWnd){
Rn*@)5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
H8kB.D[7Q hCallWnd[index]=NULL;
pQi |PQq HotKey[index]=0;
.I0M'L~!/L HotKeyMask[index]=0;
3el/,v|qj bRemoved=TRUE;
!l5@L\ KeyCount--;
sIMN""@Y^ break;
L[^.pO }
y@(EGfI }
/r8sL)D+ }
^^g u return bRemoved;
4Uhh]/ }
h_Ssm{C\ 2UG>(R: mNlbiB DLL中的钩子函数如下:
TBZhL 3hVuC1;" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
CfT(a!;Eox {
zY2x_}#Q\" BOOL bProcessed=FALSE;
j;I(w [@P if(HC_ACTION==nCode)
fohZ&f|> {
DzIV5FG if((lParam&0xc0000000)==0xc0000000){// 有键松开
1)3'Y2N* switch(wParam)
\5-Dp9vG {
U|<>xe*|% case VK_MENU:
;ojJXH~$} MaskBits&=~ALTBIT;
8)>4ZNXz break;
BOD!0CR5 case VK_CONTROL:
y;%\w-.\ MaskBits&=~CTRLBIT;
M/,lP break;
NHcA6y$Cz case VK_SHIFT:
J+TtM> MaskBits&=~SHIFTBIT;
{e1sq^>| break;
X]D:vuB default: //judge the key and send message
a'g&1N0Rc break;
'w=aLu5dY }
>2v<;. for(int index=0;index<MAX_KEY;index++){
X|yVRQ?F` if(hCallWnd[index]==NULL)
6n|][! f continue;
_S,UpR~2W if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Gx*B(t]4y {
k;K-6<^h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8|nc($}~ bProcessed=TRUE;
x`Wb9[u8 }
&Ez+4.srkh }
Q!r&vQ/g }
^Rtxef else if((lParam&0xc000ffff)==1){ //有键按下
IBUFXzl switch(wParam)
h;@>E:4Tg {
@yj~5Gf(j case VK_MENU:
SW5n?Qj3- MaskBits|=ALTBIT;
>[&ser break;
d)0|Q case VK_CONTROL:
)%<,JD MaskBits|=CTRLBIT;
gD;T"^S+ break;
bM2x
(E\O case VK_SHIFT:
7{]L{ j- MaskBits|=SHIFTBIT;
MEM(uBYKOb break;
fCZ"0P3( default: //judge the key and send message
,J=l Hj break;
l;$FR4}d }
=q>lP+ for(int index=0;index<MAX_KEY;index++){
,M:[GuXD< if(hCallWnd[index]==NULL)
NV==[$ (r continue;
Uw| -d[! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FAdTp.
{
o+L[o_er SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m2&Vm~Py6b bProcessed=TRUE;
^Nu j/ }
KEdqA/F> }
7H|0. }
4l>U13~# if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Z|fi$2k0! for(int index=0;index<MAX_KEY;index++){
4TyzD%pOw if(hCallWnd[index]==NULL)
{?q`9[Z continue;
^/cqE[V~, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+p&zM3:9w SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\T!,Z;zK //lParam的意义可看MSDN中WM_KEYDOWN部分
%zo
6A1Q; }
t1~k+ }
,tDLpnB@; }
pMY7{z return CallNextHookEx( hHook, nCode, wParam, lParam );
[XH,~JZJj }
aHb&+/HZ IwOL1\'T4 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
(N/-blto x iz+R9p BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
pju*i6z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&g>MZ"Z| cP4C<UG 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
<FAbImE} e&E7_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{:=W)
37U {
Aar]eY\ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ThkCKM {
&gW<v\6, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
kd_!S[ SaveBmp();
!T2{xmHKv$ return FALSE;
$5\!ws<cZ }
O3)B]!xL …… //其它处理及默认处理
hsJ^Au=})w }
rP,| [P0c,97_
H j'Q0DF=GV 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
]HB1JJiS~ BG)zkn$ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
t,'J%)j v;-0^s/P 二、编程步骤
+Z-{6C X-Ev>3H 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
:fnJp9c %Pl |3 i 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
AZ4:3} ^uphpABpD 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
X$G:3uoN 0M)\([W9& 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
oB>#P-V dcTZL$ 5、 添加代码,编译运行程序。
#xq3)B VKfpk^rU 三、程序代码
L@jpid95 mM2I ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
e>6W ^ ) #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
o(
mA(h #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Mn3j6a #if _MSC_VER > 1000
Bn%?{z) #pragma once
*_mER` #endif // _MSC_VER > 1000
Q[%G`;e # #ifndef __AFXWIN_H__
eu8a< #error include 'stdafx.h' before including this file for PCH
st~l|| #endif
^ UhqV"[7k #include "resource.h" // main symbols
$FDGHFM class CHookApp : public CWinApp
P #8+1iC1 {
R4'>5.M public:
k {vd1,HZ CHookApp();
4E}Q<?UYSt // Overrides
b|G~0[g // ClassWizard generated virtual function overrides
:7X{s4AU6 //{{AFX_VIRTUAL(CHookApp)
Vq/hk public:
1|s`z virtual BOOL InitInstance();
0v6Z4Ahpo virtual int ExitInstance();
$ %|b6Gr/& //}}AFX_VIRTUAL
[Jjo H1E@ //{{AFX_MSG(CHookApp)
Jt0/*^' // NOTE - the ClassWizard will add and remove member functions here.
H6>t to // DO NOT EDIT what you see in these blocks of generated code !
A>315!d" //}}AFX_MSG
qsN_EMgbdn DECLARE_MESSAGE_MAP()
.W$9nbly };
:Ig9n: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
YHke^Ind BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(CtRU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*a0#PfS[ BOOL InitHotkey();
aIr"!. 4 BOOL UnInit();
Sn
7h$ #endif
k2 _y84;D I2NMn5> //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[}
d39 #include "stdafx.h"
9eE
FX7 #include "hook.h"
;PqC*iz #include <windowsx.h>
?5;wPDsK #ifdef _DEBUG
^vv1cft #define new DEBUG_NEW
8Fbt >-N<\ #undef THIS_FILE
S$P=;#r static char THIS_FILE[] = __FILE__;
;9-J=@KY4 #endif
BZKg:;9 #define MAX_KEY 100
^y93h8\y #define CTRLBIT 0x04
s&CK #define ALTBIT 0x02
'PW/0k #define SHIFTBIT 0x01
JlawkA #pragma data_seg("shareddata")
7L6^IK HHOOK hHook =NULL;
m(1ot M9 UINT nHookCount =0;
foY]RkW9 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
<VQ@I static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&oJ[ *pQ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
a@9W'/?igk static int KeyCount =0;
|mdf u= static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0R0_UvsXU #pragma data_seg()
n$h+_xN HINSTANCE hins;
$GQEdVSNo void VerifyWindow();
- K"L6m| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
6/p9ag] //{{AFX_MSG_MAP(CHookApp)
M?<iQxtyb} // NOTE - the ClassWizard will add and remove mapping macros here.
.:B0(4Mj // DO NOT EDIT what you see in these blocks of generated code!
a3z_o)" //}}AFX_MSG_MAP
J-G)mvkv END_MESSAGE_MAP()
cg_tJ^vrY ^vzXT>t-M CHookApp::CHookApp()
[Z;H=` {
jaVx9FR+ // TODO: add construction code here,
U[q3 9FR // Place all significant initialization in InitInstance
:xO43z }
T
:^OW5 d :RYYjmG5;
CHookApp theApp;
/?|;f2tbV2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
vS:=%@c>ta {
R!\._m?\h BOOL bProcessed=FALSE;
kFT*So`' if(HC_ACTION==nCode)
zxd<Cq>d {
unnuSW#v= if((lParam&0xc0000000)==0xc0000000){// Key up
vDR>
Q&/K switch(wParam)
p]toDy-} {
B{S^t\T$ case VK_MENU:
|TJu|zv^ MaskBits&=~ALTBIT;
nDLiER;U break;
^L\w"`,~ case VK_CONTROL:
5g'aNkF6> MaskBits&=~CTRLBIT;
(tT%rj! break;
w*(1qUF#% case VK_SHIFT:
,wHlU-% MaskBits&=~SHIFTBIT;
=BV_? break;
s%m?Yh3 default: //judge the key and send message
bHTTxZ-% break;
X)c0y3hk }
-:Juxh for(int index=0;index<MAX_KEY;index++){
9`@}KnvB? if(hCallWnd[index]==NULL)
@)z?i continue;
e;"%h%' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)IIWXN2A {
gy#G; 9p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
_?bF;R bProcessed=TRUE;
EU Oa8Z }
YW8Odm }
8)b*q\O' }
n2["Ln mO else if((lParam&0xc000ffff)==1){ //Key down
Np.<&`p! switch(wParam)
=~dXP {
K8QEHc: case VK_MENU:
(8~Hr?1B MaskBits|=ALTBIT;
M{Vi4ehOq break;
3XUsw1,[ case VK_CONTROL:
9IacZ MaskBits|=CTRLBIT;
uw`J5TND break;
1vqc8lC case VK_SHIFT:
w'mn O'% MaskBits|=SHIFTBIT;
78]( ZYJV break;
'(3|hh)Tl default: //judge the key and send message
cz$*6P<9J break;
<#T#+uO }
#,!/Cnqis for(int index=0;index<MAX_KEY;index++)
!Pd) {
xP'"!d4^i if(hCallWnd[index]==NULL)
G?:5L0g continue;
Of<Vr.m{R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1nE`Wmo.2 {
"`[4(j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
=}F$r5] bProcessed=TRUE;
qx?0]!x }
Bv6~!p }
"""eU," }
E1qf N>0Z if(!bProcessed){
~(^?M for(int index=0;index<MAX_KEY;index++){
TLz>|gr if(hCallWnd[index]==NULL)
id1gK(F8H continue;
'puiahA if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.bRDz:?j SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
bHzH0v]: }
cNl$
vP83z }
-e *(+ }
- KaU@t return CallNextHookEx( hHook, nCode, wParam, lParam );
cA!o
xti }
'^,|8A2 uC 2{
Mmy BOOL InitHotkey()
0qN+W&H {
rp!{QG if(hHook!=NULL){
|W|RX3D nHookCount++;
D}nRH@<` return TRUE;
9t&m\J
>8; }
Z.U8d( else
;W@ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!q^2| % if(hHook!=NULL)
A$::|2~ nHookCount++;
h$ $i@IO0 return (hHook!=NULL);
>WY\P4)k }
z3yAb"1Hg BOOL UnInit()
,T+.xB;Q@ {
[|L~" BB if(nHookCount>1){
(:7Z-V2( nHookCount--;
3lefB
A7 return TRUE;
vUJQ<D }
[-3x *?Ju BOOL unhooked = UnhookWindowsHookEx(hHook);
}#` -mRaU if(unhooked==TRUE){
g+KuK`\N% nHookCount=0;
WiF6*]oI hHook=NULL;
|'Ksy{lA }
nh/%0=S return unhooked;
_%PEv{H0. }
7qhX`$ l3YS_WBSn BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[4\n(/ {
GbBz;ZV%z, BOOL bAdded=FALSE;
-W1Apd%> for(int index=0;index<MAX_KEY;index++){
SD1M`PI if(hCallWnd[index]==0){
p9*Ak
U&] hCallWnd[index]=hWnd;
#AH<dS HotKey[index]=cKey;
[CG*o>n&| HotKeyMask[index]=cMask;
0G#s/u# bAdded=TRUE;
Y?IX V*J KeyCount++;
p}yp!(l break;
b3+F~G-I" }
A04E <nr }
PO]c&}/ return bAdded;
%d#j%= }
<;zcz[~ dZ,~yV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
tP|ox] {
Xm~N Bt BOOL bRemoved=FALSE;
|OO2>(Fj for(int index=0;index<MAX_KEY;index++){
-AM(- if(hCallWnd[index]==hWnd){
VNxhv!w if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Y
i`wj^ hCallWnd[index]=NULL;
aHSl_[ HotKey[index]=0;
*nV*WUS3 HotKeyMask[index]=0;
$ I|K<slV bRemoved=TRUE;
d0G d5% KeyCount--;
T1YbF/M' break;
KO=H!Em\l }
Kbqx)E$iL }
D+CP?} / }
k6^!G " return bRemoved;
eq7>-Dmi@ }
jmn<gJ2Of 8'0I$Qa4 void VerifyWindow()
Ab:+AC5{ {
pXoT@[} for(int i=0;i<MAX_KEY;i++){
n_P2l<F~/x if(hCallWnd
!=NULL){ I_iXu;UX
if(!IsWindow(hCallWnd)){ xC -&<s
hCallWnd=NULL; _{y4N0
HotKey=0; =g$>]AE
HotKeyMask=0; }/.GB5Ej
KeyCount--; [>LL
} sx@%3j
} FYX"q-Z
} *.A{p ;JC(
} 3mLtnRX[m
]}>uvl^l
BOOL CHookApp::InitInstance() {7LNQGiJ
{ W$Op/
AFX_MANAGE_STATE(AfxGetStaticModuleState()); *dX
7
hins=AfxGetInstanceHandle(); t4r%EP|Zt
InitHotkey(); U6LENY+Ja
return CWinApp::InitInstance(); yFjjpEpnFt
} "D7wtpJ
50NLguE
int CHookApp::ExitInstance()
i5Dq'wp
{ ]O+W+h{]
VerifyWindow(); EOzw&M];r
UnInit(); jLF,R7t
return CWinApp::ExitInstance(); mD go@f
} wdQ%L4l
ngC^@*XAw9
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nn{PhyK
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _?c7{
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i6$q1*
#if _MSC_VER > 1000 6~!l7HqO
#pragma once @ACq:+/Qc
#endif // _MSC_VER > 1000 zF#:Uc`C5U
SuFGIb7E
class CCaptureDlg : public CDialog 2HF_kYZ
{ Y3?)*kz%
// Construction XSe\@t~&g
public: &W$s-qf".
BOOL bTray; d3tr9B
BOOL bRegistered; @$!rgLyL[
BOOL RegisterHotkey(); sJ5Ws%q
UCHAR cKey; J6RzN'j
UCHAR cMask; ,^uQw/
void DeleteIcon(); 3D2i32Y@!
void AddIcon(); #Mrc!pT]xy
UINT nCount; W?R@ eq.9
void SaveBmp(); :L5k#E"u
CCaptureDlg(CWnd* pParent = NULL); // standard constructor i{4J$KT
// Dialog Data 6QG"~>v7'(
//{{AFX_DATA(CCaptureDlg) 4-JyK%m,0
enum { IDD = IDD_CAPTURE_DIALOG }; W9/HM !
CComboBox m_Key; !]t5(g_
BOOL m_bControl; `xF^9;5mi
BOOL m_bAlt; GVld]ioycG
BOOL m_bShift; #-8%g{
CString m_Path; s|9[=JMG
CString m_Number; vhKHiw9L
//}}AFX_DATA cE+Y#jB
// ClassWizard generated virtual function overrides IT:8k5(L5j
//{{AFX_VIRTUAL(CCaptureDlg) r!y3VmJ'm
public: <7Ry"z6g;
virtual BOOL PreTranslateMessage(MSG* pMsg); B2l5}"{`
protected: W*^_Ul|
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PHxNo)
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Vi'zSR28Z
//}}AFX_VIRTUAL Tga%-xr+
// Implementation %ZM"c
protected: 1}ws@hU
HICON m_hIcon; -xL^UcG0
// Generated message map functions |wGmu&fY
//{{AFX_MSG(CCaptureDlg) EClx+tz;`
virtual BOOL OnInitDialog(); \x<i6&.
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); T*jQzcm~?
afx_msg void OnPaint(); 6}>CPi#
afx_msg HCURSOR OnQueryDragIcon(); i>%A0.9
virtual void OnCancel(); (DY&{vudF
afx_msg void OnAbout(); ]\(Ho
afx_msg void OnBrowse(); \/F*JPhy
afx_msg void OnChange(); XWag+K
//}}AFX_MSG L*(`ccU
DECLARE_MESSAGE_MAP() G|.6%-
}; #&K? N
#endif Ox9M![fC
UOn:@Qn
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e3,@prr
#include "stdafx.h" n<e1=L
#include "Capture.h" mKuY=#R P
#include "CaptureDlg.h" r2T$
;m.
#include <windowsx.h> vq:?a
#pragma comment(lib,"hook.lib") 0^K2"De
#ifdef _DEBUG a[@Y>
#define new DEBUG_NEW rk
&ME#<r
#undef THIS_FILE 7\[)5j
static char THIS_FILE[] = __FILE__; u{LtyDnik
#endif iaHL&)[YK
#define IDM_SHELL WM_USER+1 ] ]XXcQ,A
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W:JR\KKU
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o'K= X E
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ([dJ'OPx$
class CAboutDlg : public CDialog G>,43S!<
{ gubw&W
public: ;$'D13
CAboutDlg(); aY0{v X
// Dialog Data 6o&ZS @
//{{AFX_DATA(CAboutDlg) `APeS=<
&
enum { IDD = IDD_ABOUTBOX }; G.]'pn
//}}AFX_DATA !3`X Gg
// ClassWizard generated virtual function overrides mv>-XJ+
//{{AFX_VIRTUAL(CAboutDlg) qW`DCZu
protected: $
D.*r*c6
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u4|)A4n
//}}AFX_VIRTUAL ^j7>Ul,
// Implementation
*JF7 B
protected: `Gh J)WA<
//{{AFX_MSG(CAboutDlg) pU1miA '
//}}AFX_MSG ;e6L@)dp9
DECLARE_MESSAGE_MAP() >!bw8lVV
}; 'Lh nl3
6'Q*SO;1gh
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lQ&J2H<w
{ &Gs/#2XQ
//{{AFX_DATA_INIT(CAboutDlg) ~rlPS#]o
//}}AFX_DATA_INIT !GnwE
} 1>L8EImx]V
Dg*'n
void CAboutDlg::DoDataExchange(CDataExchange* pDX) QYc/f"9
{ W:hTRq
CDialog::DoDataExchange(pDX); E8L\3V4
//{{AFX_DATA_MAP(CAboutDlg) lUd4`r"
//}}AFX_DATA_MAP [*1:?mD$
} M)3'\x:
)v\ A8)[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'm0_pM1:D
//{{AFX_MSG_MAP(CAboutDlg) y+h/jEbM</
// No message handlers Yf_/c*t\5
//}}AFX_MSG_MAP -J>f,zA
END_MESSAGE_MAP() d)GR]^=r
o_a' <7\#i
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |k#EYf#Y
: CDialog(CCaptureDlg::IDD, pParent) pgPm0+N
{ E+cx8(
//{{AFX_DATA_INIT(CCaptureDlg) 8>`8p0I$+
m_bControl = FALSE; Oj
'^Ww m
m_bAlt = FALSE; /0b7"Kr
m_bShift = FALSE; +/ ?oyC+Z
m_Path = _T("c:\\"); (-xVW#39
m_Number = _T("0 picture captured."); iy|;xBI,
nCount=0; `NfwW:
bRegistered=FALSE; JA% y{Wb
bTray=FALSE; 08/Tk+
//}}AFX_DATA_INIT q);oO\<
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0{/'[o7
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Wr`<bLq1vs
} `+i/rc1.
:-$TD('F
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) sl`?9-_[
{ ~( :$c3\
CDialog::DoDataExchange(pDX); KQ ^E\,@o
//{{AFX_DATA_MAP(CCaptureDlg) SgkW-#
DDX_Control(pDX, IDC_KEY, m_Key); 2 SU
DDX_Check(pDX, IDC_CONTROL, m_bControl); Bf;<3k)5.
DDX_Check(pDX, IDC_ALT, m_bAlt); A@Cvx7X
DDX_Check(pDX, IDC_SHIFT, m_bShift); #vc!SI
DDX_Text(pDX, IDC_PATH, m_Path); MzF,is
DDX_Text(pDX, IDC_NUMBER, m_Number); F~/~_9RJ
//}}AFX_DATA_MAP &5*t*tI
} *Ag3qnY
D;z!C
ys
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9{0%M
//{{AFX_MSG_MAP(CCaptureDlg) c3WF!~1r
ON_WM_SYSCOMMAND() i!eY"|o
ON_WM_PAINT() / 2MhP=,
ON_WM_QUERYDRAGICON() WBR# Ux
ON_BN_CLICKED(ID_ABOUT, OnAbout) "n{JH9sA:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) l!": s:/'
ON_BN_CLICKED(ID_CHANGE, OnChange) bl{W{?QI
//}}AFX_MSG_MAP !Ej?9LHo
END_MESSAGE_MAP() [LrO"9q(
zb s7G
BOOL CCaptureDlg::OnInitDialog() VVfTFi<
{ 9%2he)Yqc
CDialog::OnInitDialog(); 92~$Qa\S!
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (a"/cH
ASSERT(IDM_ABOUTBOX < 0xF000); sGE%zCB
CMenu* pSysMenu = GetSystemMenu(FALSE); OW#G{#.6R
if (pSysMenu != NULL) ";^_[n
{ `|mV~F|
CString strAboutMenu; c*i,z
strAboutMenu.LoadString(IDS_ABOUTBOX); \eAV: qV
if (!strAboutMenu.IsEmpty()) k>~D
{ $01~G?:]`
pSysMenu->AppendMenu(MF_SEPARATOR); 9*XT|B
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J+wnrGoK
} `l %,4qR
} {REGoe=W%
SetIcon(m_hIcon, TRUE); // Set big icon >h.HW
SetIcon(m_hIcon, FALSE); // Set small icon rr>6;
m_Key.SetCurSel(0); GC_c.|'6[
RegisterHotkey(); )~`UDaj_
CMenu* pMenu=GetSystemMenu(FALSE); _Ud! tK*H
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +pQ3bX
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); A)&CI6(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w|NI d,#f
return TRUE; // return TRUE unless you set the focus to a control 0Qy L}y2
} *;Cpz[N
@z:E]O}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L uW""P/
{ Ucz=\dO1
if ((nID & 0xFFF0) == IDM_ABOUTBOX) }PM7CZSq
{ 5W=Jn?y2
CAboutDlg dlgAbout; m -0EcA/
dlgAbout.DoModal(); #99 =wn
} rC_saHo>#R
else w O6>jW
7
{ \ 7IT[<Se
CDialog::OnSysCommand(nID, lParam); (iIzoEpb8W
} `i+2YCk
} )`6OSB
[.6bxK
void CCaptureDlg::OnPaint() B
]sVlbt
{ M.bkFuh
if (IsIconic()) ?}= $zN
{ jv6>7@<G
CPaintDC dc(this); // device context for painting 1=e(g#Ajn\
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lXEnm-_
// Center icon in client rectangle #w8.aNU+]
int cxIcon = GetSystemMetrics(SM_CXICON); b|iIdDK
int cyIcon = GetSystemMetrics(SM_CYICON); &VcO,7 A|
CRect rect; OX?E3 <8`
GetClientRect(&rect); c= ?Tu
int x = (rect.Width() - cxIcon + 1) / 2; SLp nVD:'1
int y = (rect.Height() - cyIcon + 1) / 2; D(WV
k
// Draw the icon 3{$ >-d
dc.DrawIcon(x, y, m_hIcon); NiQ Y3Nj
} SR_-wD
else Tt=;of{
{ %a:T9v
CDialog::OnPaint(); @Vy Ne(U
} IkxoW:L
} Ocn@JOg
T_#8i^;D
HCURSOR CCaptureDlg::OnQueryDragIcon() ?.n1t@sG&
{ 7xR:\FBa^
return (HCURSOR) m_hIcon; ` k(Q:
} nc1?c1s,f
vZs~=nfi#|
void CCaptureDlg::OnCancel() jVHS1Vsei
{ l3/Cj^o4
if(bTray) }*O8]lG
DeleteIcon(); @\M^Zuo
CDialog::OnCancel(); =k;X}/
} OMd:#cWsQ
(+<66
TO
void CCaptureDlg::OnAbout() 5=}CZYWB
{ (f~}5O<
CAboutDlg dlg; )-Z*/uF^
dlg.DoModal(); Y kvEQ=
} :nfy=*M#
rq\<zx]au
void CCaptureDlg::OnBrowse() UUa@7|x
{ K$B~vy6E`
CString str; }lCQ+s!
BROWSEINFO bi; DF'~ #G8
char name[MAX_PATH]; hlz/TIP^N3
ZeroMemory(&bi,sizeof(BROWSEINFO)); 4 /v[.5
bi.hwndOwner=GetSafeHwnd(); Qz_4Ms<o
bi.pszDisplayName=name; c%&*yR
bi.lpszTitle="Select folder"; kuq&; uk$Q
bi.ulFlags=BIF_RETURNONLYFSDIRS; 06v'!M
LPITEMIDLIST idl=SHBrowseForFolder(&bi); >%slzr
if(idl==NULL) }o\} qu*
return; 6Q{OM:L/;.
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mS49l
str.ReleaseBuffer(); !DV0u)k(
m_Path=str; N P5K1:
if(str.GetAt(str.GetLength()-1)!='\\') .q!i
+0
m_Path+="\\"; H+@?K6{h
UpdateData(FALSE); ~:|V,1
} |cC&,8O:{
m Ph=bG
void CCaptureDlg::SaveBmp() NRspi_&4J
{ Y{Lxo])e
CDC dc; @gmo;8?k
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0}|%pmY`
CBitmap bm; &7\fj
int Width=GetSystemMetrics(SM_CXSCREEN); fu-,<m{
int Height=GetSystemMetrics(SM_CYSCREEN); K4I/a#S'@6
bm.CreateCompatibleBitmap(&dc,Width,Height); 2L51H(
CDC tdc; 5KIhk`S
tdc.CreateCompatibleDC(&dc); yS3or(K
CBitmap*pOld=tdc.SelectObject(&bm); #\O'*mz
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QIJ/'72
tdc.SelectObject(pOld); i [Wxu M
BITMAP btm; {XD':2E
bm.GetBitmap(&btm); g_?Q3
DWORD size=btm.bmWidthBytes*btm.bmHeight; )n[=)"rf
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); DbtkWq%
BITMAPINFOHEADER bih; 6\.LG4@LO
bih.biBitCount=btm.bmBitsPixel; \'|t>|zhp
bih.biClrImportant=0; n-,mC/4
bih.biClrUsed=0; &qIdT;^=I
bih.biCompression=0; fKtlfQG
bih.biHeight=btm.bmHeight; tx Qr|\4k
bih.biPlanes=1; B(O6qWsL
bih.biSize=sizeof(BITMAPINFOHEADER); x5rLGt
bih.biSizeImage=size; &l4kwds R
bih.biWidth=btm.bmWidth; L:Mjd47L
bih.biXPelsPerMeter=0; -8dz`o}
bih.biYPelsPerMeter=0; +rhBC
V
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K}GRU)
static int filecount=0; Prc1U)nfo
CString name; /x_AWnU
name.Format("pict%04d.bmp",filecount++); F
IB)cpo
name=m_Path+name; Y]5MM:mI
BITMAPFILEHEADER bfh; O`aNNy
bfh.bfReserved1=bfh.bfReserved2=0; \MPbG$ ^
bfh.bfType=((WORD)('M'<< 8)|'B'); sI09X6)
bfh.bfSize=54+size; $Zkk14
bfh.bfOffBits=54; @gM}&G08
CFile bf; PzhC *" i}
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2U"2L^oKI
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); SMfa(+V I
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A5]yC\*zt
bf.WriteHuge(lpData,size); e<FMeg7n
bf.Close(); Z`zLrXPD)
nCount++; 4X+I2CD
} ]\k&
l
['
GlobalFreePtr(lpData); <'7s3
if(nCount==1) x"cB8bZ!$
m_Number.Format("%d picture captured.",nCount); IYH4@v/#
else 5g$>J)Ry
m_Number.Format("%d pictures captured.",nCount); mAJ'>^`^
UpdateData(FALSE); Kb1@ +
} r:4]:NKCi
]KG.-o30
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h~z}NP
{ u0g"x_3
if(pMsg -> message == WM_KEYDOWN) L{&=SR.
{ Vo%Z|
if(pMsg -> wParam == VK_ESCAPE) c%(Ndi
return TRUE; R|``A5zQ
if(pMsg -> wParam == VK_RETURN) A..`?oGj
return TRUE; 0;`+e22
} [F(iV[n%
return CDialog::PreTranslateMessage(pMsg); :2')`xT
} zE?dQD^OD
2v#gCou
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q:iu
hI$~G
{ UnEgsfN
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !41"`D!1
SaveBmp(); p{``a=
return FALSE; GCv1x->
} _>?.MUPB
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Q:T9&_|
CMenu pop; n.R"n9v`
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cRNVqMpg
CMenu*pMenu=pop.GetSubMenu(0); GdrVH,j
pMenu->SetDefaultItem(ID_EXITICON); S2W@;XvV
CPoint pt; ^\Q%VTM
GetCursorPos(&pt); ZvO1=*
J,
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~`B]G
if(id==ID_EXITICON) {Ve`VV5E
DeleteIcon(); pK"Z9y&
else if(id==ID_EXIT) In+2~Jw/2!
OnCancel(); #^$_3AY
return FALSE; F2EX7Crj
} ?32i1F!
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \C$cbI=;+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qElPYN*wF
AddIcon(); vL^ +X`.td
return res; RZ ?SiwE
} |zd5P
w|*D{`O
void CCaptureDlg::AddIcon() {LCKt/Z>P
{ x~{W(;`!
NOTIFYICONDATA data; N%1nii
data.cbSize=sizeof(NOTIFYICONDATA); vg_PMy\
CString tip; x\VP
X
tip.LoadString(IDS_ICONTIP); bka%W@Y%
data.hIcon=GetIcon(0); @U1t~f^
data.hWnd=GetSafeHwnd(); rq}xuSFI
strcpy(data.szTip,tip); oEj$xm_}
data.uCallbackMessage=IDM_SHELL; x-4d VKE*z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v$5D&Tv
data.uID=98; { 9\/aXPS
Shell_NotifyIcon(NIM_ADD,&data); {k[dg0UV
ShowWindow(SW_HIDE); 4Mt RI
bTray=TRUE; wrK@1F9!
} lIO#)>
5j9%W18
void CCaptureDlg::DeleteIcon() o=xMaA
{ 0<fQjXn
NOTIFYICONDATA data; nQa:t. rC
data.cbSize=sizeof(NOTIFYICONDATA); YQD/vc~8G
data.hWnd=GetSafeHwnd(); ~@[<y1g?nG
data.uID=98; @l5GBsLK
Shell_NotifyIcon(NIM_DELETE,&data); 9jNh%raG|
ShowWindow(SW_SHOW); NX:\iJD)1U
SetForegroundWindow(); JLjs`oqh
ShowWindow(SW_SHOWNORMAL); }_@p`>|)rB
bTray=FALSE; -9o7a_Z
} +RkXe;q
K,*-Y)v2W
void CCaptureDlg::OnChange() .NxskXq)
{ WORRF
RegisterHotkey(); EVA&By6_k
} u),.q7(m
5l%g3F
BOOL CCaptureDlg::RegisterHotkey() }Gx@1)??
{ uf:'"7V7
UpdateData(); K*4ib/'E a
UCHAR mask=0; ]&P 4QT)f
UCHAR key=0; *Ue#Sade
if(m_bControl) 2:e7'}\D.
mask|=4; CteNJBm
if(m_bAlt) U9awN&1([
mask|=2; :QXKG8^
if(m_bShift) 7+hc?H[&'
mask|=1; ua_,c\iL
key=Key_Table[m_Key.GetCurSel()]; W%o! m,zFM
if(bRegistered){ A0v@L6m-O
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2d
YU
bRegistered=FALSE; Ag8lI+
h
} 1Y~'U
=9
cMask=mask; 4-$kcwA
cKey=key; U:[CcN/~3
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9JJ6$cLF
return bRegistered; s%6L94\t
} ej=}OH4
b5f+q:?{
四、小结 UDnCHGq
H6`zzH0"
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。