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:
1c]GS&(RP ;e+ErN`a.~ 一、实现方法
*cf#:5Nl `,J\E<4J 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:
SJ<nAX ?Pa5skqR #pragma data_seg("shareddata")
2vynz,^ET HHOOK hHook =NULL; //钩子句柄
)gZ yW
UINT nHookCount =0; //挂接的程序数目
uKK+V6}!kj static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
`On%1%k8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]`LMyt0 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
YM-,L-HMA static int KeyCount =0;
W+e static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
<%!EI@N #pragma data_seg()
"lB[IB) 'Je;3"@ 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。
rAgb<D@,H 5~v({R. 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:
k/>k&^? L:7%W dyh BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
L+&$/1h] cKey,UCHAR cMask)
f mf(5 {
/>H9T[3= BOOL bAdded=FALSE;
ol-U%J for(int index=0;index<MAX_KEY;index++){
_qr?v=,-A if(hCallWnd[index]==0){
'bTtdFvJ hCallWnd[index]=hWnd;
(m13
ong HotKey[index]=cKey;
dj 4:r!5_ HotKeyMask[index]=cMask;
5LR
k)@t bAdded=TRUE;
u{J$]%C
KeyCount++;
W2'u]1bs break;
f-^JI*hj }
S/V%<<[>p] }
5y0N }} return bAdded;
RGsgT ^ }
tw,uV)xm //删除热键
zt6GJz1q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
xcty {
)vn{?Ulj BOOL bRemoved=FALSE;
G8}k9?26( for(int index=0;index<MAX_KEY;index++){
0.+MlyA if(hCallWnd[index]==hWnd){
@cukoLAn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"\3C)Nz? hCallWnd[index]=NULL;
6o6I]QL HotKey[index]=0;
1aDx 6Mq HotKeyMask[index]=0;
s+DOr$\ bRemoved=TRUE;
VX0}x+LJ KeyCount--;
DZ"'GQSg break;
#A\@)wJ }
Xh+;$2l.B }
a]]eQ(xQ }
f?W_/daP return bRemoved;
9eBD)tnw }
[>![ViX E6XDn`: zcGmru|k DLL中的钩子函数如下:
H\RejGR jl9hFubwW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5If.[j{ {
?.Q$@Ih0 BOOL bProcessed=FALSE;
T5|e\<l if(HC_ACTION==nCode)
MQ#k`b#() {
z.lIlp2: if((lParam&0xc0000000)==0xc0000000){// 有键松开
,Wv+Ek switch(wParam)
}k;wSp[3 {
C cPOK2 case VK_MENU:
jh(T?t$& MaskBits&=~ALTBIT;
f*}}Az.4 break;
1%ENgb:8 case VK_CONTROL:
L>L IN 1A MaskBits&=~CTRLBIT;
Fs"i fn0 break;
^hNl6)hR case VK_SHIFT:
MX? *jYl MaskBits&=~SHIFTBIT;
.+A)^A break;
_AzI\8m default: //judge the key and send message
Me79:+d break;
>dx/k)~~-L }
tq}MzKI* for(int index=0;index<MAX_KEY;index++){
<2N{oK. if(hCallWnd[index]==NULL)
{7jl) x3l continue;
zZ6m`]{B9? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:{+~i.* {
%_."JT$v{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
OClG dFJ| bProcessed=TRUE;
:_}xN!9LA }
_K}q%In }
_3(rwD }
fV@[S else if((lParam&0xc000ffff)==1){ //有键按下
9#TD1B/ switch(wParam)
Q3Pu<j}Y {
vJxEF&X case VK_MENU:
3Q'vVNFh< MaskBits|=ALTBIT;
l`.z^+!8@ break;
?5FlbiT case VK_CONTROL:
LaO8)lqR MaskBits|=CTRLBIT;
SIapY%)h break;
"\i H/ case VK_SHIFT:
( +Sv3h MaskBits|=SHIFTBIT;
?z`={oN break;
ynv{
rMl default: //judge the key and send message
)X-'Q - break;
,A'| Z }
"MU-&** for(int index=0;index<MAX_KEY;index++){
(?m{G Q if(hCallWnd[index]==NULL)
- w*fS,O continue;
<3!Al,!ej@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6#7hMQ0&;O {
HdN5zl,q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
o3V\ bProcessed=TRUE;
bn)1G$0| }
G &xtL }
$m;`O_-T }
Xf_#O'z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
t5%cpkgh4 for(int index=0;index<MAX_KEY;index++){
+l^tT&s;f if(hCallWnd[index]==NULL)
ffG<hclk continue;
+@=V}IO if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
u8T@W}FX SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
P&sWn?q Ol //lParam的意义可看MSDN中WM_KEYDOWN部分
pd:7K'yaw }
QuqznYSY{ }
OL>)SJj5 }
ydy TDn return CallNextHookEx( hHook, nCode, wParam, lParam );
a;t}'GQGk }
&y5"0mA RI@\cJ\} 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
o>_})WM1[ Sp492W+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ka~_iUU4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
(B>/LsTu >*RU:X 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
K_;vqi^1^& S7)qq LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
SK
lvZ
{
4d`YZNvZW/ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
B~w$j/sWU {
iqvLu{ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*[{j'7*cc SaveBmp();
9a=Ll]=\ return FALSE;
nd]SI;< }
aOH|[ …… //其它处理及默认处理
l)9IgJ|<b }
^FKiVKI: RNi%6A1 zbmC?2$ 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。
r }lGcG) eAf i!!Z< 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。
@j^R+F x="Wqcnj{ 二、编程步骤
=p8uP5H tw_o?9 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";
r,Uk)xa/^ !&{rnK 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ZeP=}0TGjn m+0yf(w 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;
o]4]fLQ YI g(^>sq 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;
}T@=I&g; +nE>)ZH 5、 添加代码,编译运行程序。
nF@**,C Q OP`f[lCiL 三、程序代码
j6GIB_ J,F1Xmr4 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?H=q!i #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
8:$h&aBI #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Nap[=[rv #if _MSC_VER > 1000
sp,-JZD #pragma once
r[S(VPo[() #endif // _MSC_VER > 1000
CRK%^3g #ifndef __AFXWIN_H__
9MMCWMV #error include 'stdafx.h' before including this file for PCH
2!{D~Gfl= #endif
yp#!$+a} #include "resource.h" // main symbols
AJ\&>6GZ(b class CHookApp : public CWinApp
g'7E6n"!, {
Dh8ECy5k<* public:
Sc7 Ftb% CHookApp();
N&HI)X2& // Overrides
QQrldc(I // ClassWizard generated virtual function overrides
7*l$i/! //{{AFX_VIRTUAL(CHookApp)
xDo0bR( public:
i g(O$y virtual BOOL InitInstance();
$Zu?Gd? virtual int ExitInstance();
F\m^slsu7= //}}AFX_VIRTUAL
.d<K` .O; //{{AFX_MSG(CHookApp)
[Fl_R[o // NOTE - the ClassWizard will add and remove member functions here.
.nPOjwEx&Y // DO NOT EDIT what you see in these blocks of generated code !
j'D%eQI,V //}}AFX_MSG
?9`j1[0 DECLARE_MESSAGE_MAP()
w:5?ofC };
ON,[!pc LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k+J%o%* < BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`D4Wg<,9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
W_W !v&@E= BOOL InitHotkey();
Tqt-zX|> BOOL UnInit();
danPy2 #endif
?()*"+N(ck B[N]=V //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
M~A#_%2U #include "stdafx.h"
q`9.@u@ a #include "hook.h"
-8 uS# #include <windowsx.h>
"`qk}n- #ifdef _DEBUG
|p:4s"NT #define new DEBUG_NEW
)ros-dp` #undef THIS_FILE
,Kv6!ib6Q static char THIS_FILE[] = __FILE__;
Uu_qy(4 #endif
p*Z<DEh# #define MAX_KEY 100
`NIb?/!f #define CTRLBIT 0x04
2R\K!e #define ALTBIT 0x02
2P"643tz #define SHIFTBIT 0x01
UD-+BUV #pragma data_seg("shareddata")
r8EJ@pOF2w HHOOK hHook =NULL;
Jh-yIk UINT nHookCount =0;
C
m:AU; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
~O}r<PQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
hIV9 .{J static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ca~8cQ static int KeyCount =0;
Wd'}YbC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
7h\is #pragma data_seg()
\@@ G\\)er HINSTANCE hins;
{8m&Z36E void VerifyWindow();
\rr"EAk] BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
hk?i0#7W //{{AFX_MSG_MAP(CHookApp)
`y>m
>j // NOTE - the ClassWizard will add and remove mapping macros here.
.#&)%}GC // DO NOT EDIT what you see in these blocks of generated code!
hi(b\ABx //}}AFX_MSG_MAP
q /JC\ END_MESSAGE_MAP()
TCp9C1Q4 Fl)nmwOc CHookApp::CHookApp()
/4;mjE {
<V^o.4mOg> // TODO: add construction code here,
zZMKgFR@ // Place all significant initialization in InitInstance
RvR.t"8 }
2hHRitt36 g:!U,<C^a CHookApp theApp;
Fg`<uW]TFZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
T6/P54S {
ew\:&"@2]w BOOL bProcessed=FALSE;
-|V#U`mwF if(HC_ACTION==nCode)
#ft9ms#N {
|sGJum&= if((lParam&0xc0000000)==0xc0000000){// Key up
.i;.5)shsu switch(wParam)
fq>{5ODO {
"~VKUvDu case VK_MENU:
`+Nv=vk MaskBits&=~ALTBIT;
+
E{[j break;
>~,~X9 case VK_CONTROL:
F > rr. MaskBits&=~CTRLBIT;
a<-aE4wdm break;
?l~qb]._ case VK_SHIFT:
>,,`7%Rv MaskBits&=~SHIFTBIT;
7)U
ik}0 break;
p-j6H default: //judge the key and send message
Jj)J5S / break;
E]Mx<7;\. }
,|*Gr"Q= for(int index=0;index<MAX_KEY;index++){
Tv#d>ZSD if(hCallWnd[index]==NULL)
l$5nv5r continue;
*$O5.`] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|dxWO {
6D| F1UFU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&Sg]P bProcessed=TRUE;
29=ob(" }
f
I%8@ : }
Gd|kAC
g }
'9QEG/v else if((lParam&0xc000ffff)==1){ //Key down
R?1Z[N switch(wParam)
.$s']' = {
fTpG>*{p case VK_MENU:
)&E] MaskBits|=ALTBIT;
F;_c x break;
a(~X case VK_CONTROL:
8GBKFNR8 MaskBits|=CTRLBIT;
KC"S06 break;
l[~$9C'ji case VK_SHIFT:
Zb_A(mnzh MaskBits|=SHIFTBIT;
gdCit-3 break;
jW7ffb
`O default: //judge the key and send message
} J?,?>Z break;
CA|l|
t^ }
aA$\iFYA for(int index=0;index<MAX_KEY;index++)
9Tr ceL; {
`}`Q qv if(hCallWnd[index]==NULL)
FI: H/e5[ continue;
4IW
fp&Q! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
eV%{XR?y {
onmpMU7w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-'O|D} bProcessed=TRUE;
[*u\ S }
&~;M16XM,e }
q{V e%8$" }
&KBDrJEX if(!bProcessed){
&_]G0~e for(int index=0;index<MAX_KEY;index++){
8D>5(Dg- if(hCallWnd[index]==NULL)
%AJ9fs4/ continue;
` Ft-1eE if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
WI&A+1CK-5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;ZuHv {= }
WL(Y1>|j }
fn/?I\ }
f?ycZ return CallNextHookEx( hHook, nCode, wParam, lParam );
UUDbOxD^w }
4<tbZP3/6) B#hvw'} BOOL InitHotkey()
(xvg.Nby {
..h@QQ if(hHook!=NULL){
(`slC~" nHookCount++;
'4 d4i return TRUE;
;o)'dK }
s)E8}-v else
.Y2Hd$rs hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
&x B^ if(hHook!=NULL)
)?OdD7gd nHookCount++;
@r[SqGa: return (hHook!=NULL);
TDZ==<C }
y$nI?:d BOOL UnInit()
ewT
K2 {
ae-tAA[1Y if(nHookCount>1){
Ax\d{0/oL2 nHookCount--;
-rYb{<;ST return TRUE;
_t"[p_llo }
P<Z` 8a[ BOOL unhooked = UnhookWindowsHookEx(hHook);
6:S,
{@G if(unhooked==TRUE){
F,)+9/S& nHookCount=0;
F5+FO^3E hHook=NULL;
T^MY w }
wQhu U return unhooked;
WJ-.?
}
|5`ecjb. r[^.\&- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\z6UWZ {
uWClT): BOOL bAdded=FALSE;
D=vw0Q_3Y3 for(int index=0;index<MAX_KEY;index++){
A@_>9; if(hCallWnd[index]==0){
F{QOu0$cA4 hCallWnd[index]=hWnd;
I74Rw*fB HotKey[index]=cKey;
<sm"3qs"_ HotKeyMask[index]=cMask;
!_3b#Caf bAdded=TRUE;
49>b]f,Vc KeyCount++;
K_ymA,&() break;
C7R3W, }
{[:C_Up)f }
t90M]EAV return bAdded;
fBZLWfp9 }
:zo5`[P Nz3+yxv1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I+twI&GS {
2 <OU)rVE4 BOOL bRemoved=FALSE;
a+J> for(int index=0;index<MAX_KEY;index++){
dHiir&Rd9` if(hCallWnd[index]==hWnd){
VI9rezZ* if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
o:cTc:l) hCallWnd[index]=NULL;
3QZm
*.
/" HotKey[index]=0;
9XQE5^ HotKeyMask[index]=0;
@i(9k bRemoved=TRUE;
e0TxJ* KeyCount--;
QsxvA;7% break;
mzM95yQ^Z }
2G-"HOG }
c\>I0HH;! }
"|J6*s return bRemoved;
aY,Bt }
|uz<) toDi70o void VerifyWindow()
gfN=0Xj4 {
'{~[e** for(int i=0;i<MAX_KEY;i++){
Kv1~,j6 if(hCallWnd
!=NULL){ f{L;,
if(!IsWindow(hCallWnd)){ 'ParMT
hCallWnd=NULL; EpR n,[
HotKey=0; mE{QT ZS
HotKeyMask=0; PN9vg9'
KeyCount--;
%X\A|V&
} #6#n4`%ER
} I:oEt
} w[l#0ZZ
} 6y
Muj<L
yc9!JJMkH
BOOL CHookApp::InitInstance() i"
u|119
{ E <j=5|0t
AFX_MANAGE_STATE(AfxGetStaticModuleState()); bcT_YFLQ
hins=AfxGetInstanceHandle(); (i(E~^O
InitHotkey(); 9?hF<}1XH}
return CWinApp::InitInstance(); :,v(lq
} _hl| 3
eW5
):tv V
int CHookApp::ExitInstance() gn/]1NNfR
{ =,ax"C?pR
VerifyWindow(); `Nvhp]E
UnInit(); 8Vn
return CWinApp::ExitInstance(); \VIY[6sn\M
} W!.FnM5x
dVMl;{
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jCtk3No
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Bx}"X?%S
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ZBY}Mz$
#if _MSC_VER > 1000 UJp'v_hN
#pragma once 9'~qA(=.?
#endif // _MSC_VER > 1000 la)+"uW
S/pU|zV[
class CCaptureDlg : public CDialog Hr}"g@ <
{ h7K,q S
// Construction 7z, $
public: MW+DqT.h
BOOL bTray; By!u*vSev
BOOL bRegistered; =bJ$>Djp
BOOL RegisterHotkey(); ,Iz9!i
J"
UCHAR cKey; >m%TUQ#%
UCHAR cMask; 0)h.[O8@>
void DeleteIcon(); 8'3&z-
void AddIcon(); 3"0QW4A
UINT nCount; am.d^'
void SaveBmp(); s8]%L4lvu
CCaptureDlg(CWnd* pParent = NULL); // standard constructor }0H<G0
// Dialog Data {P?DkUO}
//{{AFX_DATA(CCaptureDlg) $(0<T<\
enum { IDD = IDD_CAPTURE_DIALOG }; yRyRH%p)
CComboBox m_Key; !E00I0W-h
BOOL m_bControl; ,*lns.|n
BOOL m_bAlt; $X.F=Kv
BOOL m_bShift; B3[X{n$px
CString m_Path; W2$rC5|
CString m_Number; #>_fYjT
//}}AFX_DATA N@k'
s
// ClassWizard generated virtual function overrides j+AZ!$E
//{{AFX_VIRTUAL(CCaptureDlg) yCkWuU9
public: \J?&XaO=
virtual BOOL PreTranslateMessage(MSG* pMsg); q\!"FDOl4
protected: `'r]Oe
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r:0RvWif
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Bw`? zd\*
//}}AFX_VIRTUAL :u=y7[I
// Implementation 3bC-B!{;g
protected: gV ':Xe
HICON m_hIcon; &l{ctP%q
// Generated message map functions Lnn^j#n
//{{AFX_MSG(CCaptureDlg) 0VR,I{<.{
virtual BOOL OnInitDialog(); t*BCpC}
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); fIx|0,D&7L
afx_msg void OnPaint(); ZZ!6O /M
afx_msg HCURSOR OnQueryDragIcon(); Eqny'44
virtual void OnCancel(); {t0!N]'
afx_msg void OnAbout(); Oa@SyroF=
afx_msg void OnBrowse(); #|:q"l9
afx_msg void OnChange(); yl' IL#n]r
//}}AFX_MSG BgCEv"G5
DECLARE_MESSAGE_MAP() 1T~`$zS7
}; J$jLGy& '
#endif }\N ~%?6D
"Gqas bX
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PDgZb
#include "stdafx.h" 4T)`%Oo<}
#include "Capture.h" *$('ous8
#include "CaptureDlg.h" #>5T,[{?j
#include <windowsx.h> 98zJ?NaD&
#pragma comment(lib,"hook.lib") NgxJz
]b
#ifdef _DEBUG @frV:%
#define new DEBUG_NEW |N^8zo :
#undef THIS_FILE Uul5h8F
static char THIS_FILE[] = __FILE__; jM{5nRQ
#endif a)+*Gf7?
#define IDM_SHELL WM_USER+1 ]wbV1Y"
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cUi6 On1C
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VeFfkg4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %3HF_DNOY=
class CAboutDlg : public CDialog ^\VVx:]
{ 11A;z[Zk
public: [zrFW
g6N
CAboutDlg(); <1~_nt~(*
// Dialog Data X1u\si%.4S
//{{AFX_DATA(CAboutDlg) `v/p4/
enum { IDD = IDD_ABOUTBOX }; Y|-&=
//}}AFX_DATA ,MLAW
// ClassWizard generated virtual function overrides Fb{HiU9<!
//{{AFX_VIRTUAL(CAboutDlg) cft@sY
protected: jR3mV
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -gb@BIV#
//}}AFX_VIRTUAL 7.yCs[Z
// Implementation =G 'c %
protected: &y3;`A7,
//{{AFX_MSG(CAboutDlg)
#V[Os!ns
//}}AFX_MSG Fl==k
DECLARE_MESSAGE_MAP() R&/"?&pfa
}; %~Wr/TOt+
e:QH3|'y
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V-dub{K
{ ZtI@$ An
//{{AFX_DATA_INIT(CAboutDlg) ~!Rf5QA85
//}}AFX_DATA_INIT &D7Mv5i0@
} -BrJ5]T>*
l>7?B2^<E
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .z,`{-7U
{ immf\
CDialog::DoDataExchange(pDX); #Y'ub
5s
//{{AFX_DATA_MAP(CAboutDlg) Qz<i{r-z
//}}AFX_DATA_MAP p<RIvSqM
} |A)a
='Ap
'z};tIOKJk
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %LnG^L
//{{AFX_MSG_MAP(CAboutDlg) 3HndE~_C&
// No message handlers AD'c#CT
//}}AFX_MSG_MAP #<w2xR]:
END_MESSAGE_MAP() Oh7wyQiV
J>0RN/38o
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T'14OU2N{Y
: CDialog(CCaptureDlg::IDD, pParent) 6s:
{ 7C@m(oK
//{{AFX_DATA_INIT(CCaptureDlg) TI^X gl~
m_bControl = FALSE; ;'4Kg@/
m_bAlt = FALSE; pG$l
m_bShift = FALSE; 1W>0
m_Path = _T("c:\\"); |f[:mO
m_Number = _T("0 picture captured."); 6#2E {uy;R
nCount=0; H<3ayp$
bRegistered=FALSE; B}d)e_uLj
bTray=FALSE; )5s-"o<
//}}AFX_DATA_INIT s#(<zBZ9p#
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >% E=l
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t)l^$j!h@
} kE{-h'xADD
pxQh;w
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g+ cH
{ 9+frxD&pO
CDialog::DoDataExchange(pDX); ZX40-6#O
//{{AFX_DATA_MAP(CCaptureDlg) ztaSIMZ
DDX_Control(pDX, IDC_KEY, m_Key); cq1)b\ |
DDX_Check(pDX, IDC_CONTROL, m_bControl); 4AN(4"$N
DDX_Check(pDX, IDC_ALT, m_bAlt); a+`;:tX,
DDX_Check(pDX, IDC_SHIFT, m_bShift); %uy?@ e
DDX_Text(pDX, IDC_PATH, m_Path); :h<QM$P<
DDX_Text(pDX, IDC_NUMBER, m_Number); NKu*kL}W=
//}}AFX_DATA_MAP yxy~N\0
} ^A t,x
9Qc=D"'
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _I#a`G
//{{AFX_MSG_MAP(CCaptureDlg) o:RO(oA0?
ON_WM_SYSCOMMAND() esHcE{GNOS
ON_WM_PAINT() (fC U+
ON_WM_QUERYDRAGICON() A}0u-W
ON_BN_CLICKED(ID_ABOUT, OnAbout)
.v#Tj|w^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M}!E :bv'
ON_BN_CLICKED(ID_CHANGE, OnChange) >L88`
//}}AFX_MSG_MAP `g,i`<
END_MESSAGE_MAP() EceD\}
Ccy0!re
BOOL CCaptureDlg::OnInitDialog() ]iH~1 [
{ jsIT{a*]
CDialog::OnInitDialog(); 0"xD>ue&
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -F';1D!l%
ASSERT(IDM_ABOUTBOX < 0xF000); %`^{Hh`
CMenu* pSysMenu = GetSystemMenu(FALSE); hkvymHaG
if (pSysMenu != NULL) M[5fNK&nD
{ ,Zs*07!$f
CString strAboutMenu; @DCw(.k*
strAboutMenu.LoadString(IDS_ABOUTBOX); k(3FT%p
if (!strAboutMenu.IsEmpty()) 4*_. m9{
{ #s|/5[i
pSysMenu->AppendMenu(MF_SEPARATOR); {s~t>R p+
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A&qZ:&(OM
} 2g_2$)2
} bxF'`^En
SetIcon(m_hIcon, TRUE); // Set big icon 8H2A<&3i
SetIcon(m_hIcon, FALSE); // Set small icon `:;fc
m_Key.SetCurSel(0); U
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RegisterHotkey(); HT=-mwa_]
CMenu* pMenu=GetSystemMenu(FALSE); 2vX!j!_
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iig@$
i#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rn%q*_3-o
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Om C
F8:\/
return TRUE; // return TRUE unless you set the focus to a control tJZ3P@ L
} 'jd fUB
5jK9cF$>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5SwQ9#
{ qZ DP-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) CC{{@
{ y,vrMWDy
CAboutDlg dlgAbout; dpI! {'"M
dlgAbout.DoModal(); {qPu}?0
} Y|N.R(sAs&
else K._*
~-A
{ ?UV!^w@L:0
CDialog::OnSysCommand(nID, lParam); ($*R>*6<x
} _t;Mi/\P
} PvqG5-L~W
-4nSiI
void CCaptureDlg::OnPaint() 137:T:
{ G}p*oz~
if (IsIconic()) y?yWM8
{ Fd/.\s
CPaintDC dc(this); // device context for painting r@]iy78
j
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u(Y?2R
// Center icon in client rectangle Pvu*Y0_p
int cxIcon = GetSystemMetrics(SM_CXICON); k<!xOg
int cyIcon = GetSystemMetrics(SM_CYICON); g~Agy
CRect rect; )0p7d:%mV
GetClientRect(&rect); )6
[d'2
int x = (rect.Width() - cxIcon + 1) / 2; -mAi7[omh
int y = (rect.Height() - cyIcon + 1) / 2; ZT%Q:]B+
// Draw the icon k&SI-jxj
dc.DrawIcon(x, y, m_hIcon); y9)Rl)7-:
} $kCLS7 *
else S
0L"5B@
{ x4nmDEpa
CDialog::OnPaint(); UfAN)SE"
} %P tdFz$
} !Au 9C
mnS F=l;;
HCURSOR CCaptureDlg::OnQueryDragIcon() |\_d^U&`
{ 3X
A8\Mg
return (HCURSOR) m_hIcon; ,CA3Q.y>|
} a.!|A(zw
W2G@-`,
void CCaptureDlg::OnCancel() w*7BiZ{s<
{ BARs1^pR4
if(bTray) DQRr(r~2Kj
DeleteIcon(); |$aTJ9 Iq:
CDialog::OnCancel(); +1Ua`3dWN_
} @Ap~Wok
^t#W?rxp&
void CCaptureDlg::OnAbout() hAv.rjhw_
{ S@PAtB5
CAboutDlg dlg; H|i39XV
dlg.DoModal(); +9d]([Lx
} 60r4%>d
OD\F*Ry~
void CCaptureDlg::OnBrowse() ri?>@i-9=
{
re;^,
CString str; {3{cU#\QA
BROWSEINFO bi; &mJ
+#vT
char name[MAX_PATH]; b9gezXAcd
ZeroMemory(&bi,sizeof(BROWSEINFO)); ,Kw]V %xOb
bi.hwndOwner=GetSafeHwnd(); a2tRmil
bi.pszDisplayName=name; EA+}Rf6}
bi.lpszTitle="Select folder"; vPbmQh ex
bi.ulFlags=BIF_RETURNONLYFSDIRS; pk,]yi,ZF
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hp!c\z;
if(idl==NULL) mcB8xE
return; ]-b`uYb
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8kwe ._&)
str.ReleaseBuffer(); A:-r2;xB
m_Path=str; ;mw$(ZKa#
if(str.GetAt(str.GetLength()-1)!='\\') ?6=u[))M&
m_Path+="\\"; 2Yt+[T*
UpdateData(FALSE); 5o&noRIIr
} e dv&!
uO,9h0y0W
void CCaptureDlg::SaveBmp() j jLwHJ
{ >|S&@<
CDC dc; !QTfQ69Y0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); wQV[ZfU^h
CBitmap bm; 1!4-M$-
int Width=GetSystemMetrics(SM_CXSCREEN); 7eyVm;LQD
int Height=GetSystemMetrics(SM_CYSCREEN); ;&N=t64"
bm.CreateCompatibleBitmap(&dc,Width,Height); GV"Hk E;
CDC tdc; +4Uxq{.K
tdc.CreateCompatibleDC(&dc); $V0G[!4
CBitmap*pOld=tdc.SelectObject(&bm); ZFNn(n
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^UEExjf
tdc.SelectObject(pOld); 2sryhS'(H
BITMAP btm; QxaW
x
bm.GetBitmap(&btm); CC<(V{Png
DWORD size=btm.bmWidthBytes*btm.bmHeight; {r,MRZaa
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hhU:
nw
BITMAPINFOHEADER bih; 1'G&PX
bih.biBitCount=btm.bmBitsPixel; SZhW)0
bih.biClrImportant=0; R
rtr\a
bih.biClrUsed=0; 1"4Pan
bih.biCompression=0; +%%Ef]
bih.biHeight=btm.bmHeight; c\\'x\J7
bih.biPlanes=1; #!i&
bih.biSize=sizeof(BITMAPINFOHEADER); bkvm-$/
bih.biSizeImage=size; +"i|)yUYy}
bih.biWidth=btm.bmWidth; % >\v6ea
bih.biXPelsPerMeter=0; c :{#H9
bih.biYPelsPerMeter=0; UbnX%2TW
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Mt93YD-2+
static int filecount=0; G'M;]R9EP
CString name; TJY
[s-
name.Format("pict%04d.bmp",filecount++); 'Cv>V"X: `
name=m_Path+name; BM,]Wjfdj
BITMAPFILEHEADER bfh; y|7sh
bfh.bfReserved1=bfh.bfReserved2=0; Hv~&RZpe
bfh.bfType=((WORD)('M'<< 8)|'B'); DN GXp5I
bfh.bfSize=54+size; Q^H8gsv
bfh.bfOffBits=54; B,_/'DneQK
CFile bf; ,_$}>MY;
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QQPT=_P]
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XDt MFig
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U_8 Z&
bf.WriteHuge(lpData,size); 6`
8H k;
bf.Close(); /~O>He
nCount++; T{"[Ih3Mbl
} #aeKK7[
GlobalFreePtr(lpData); sgGXj7
if(nCount==1) EDA%qNd]j
m_Number.Format("%d picture captured.",nCount); nhu;e}[>
else w1&\heSQ
m_Number.Format("%d pictures captured.",nCount); jGSY$nt9
UpdateData(FALSE); ;K$ !c5
} v><c@a=[
p|gzU$FWbk
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) cS2PrsUx
{ @CTSvTt$
if(pMsg -> message == WM_KEYDOWN) 3 i;sB
{ <3)k M&.B
if(pMsg -> wParam == VK_ESCAPE) lM|}K-2
return TRUE; ]<xzCPB
if(pMsg -> wParam == VK_RETURN) $SOFq+-T
return TRUE; s?5vJ:M
Xr
} ]J(BaX4
return CDialog::PreTranslateMessage(pMsg); lZr}F.7
} s 0To^I
D^Gs_z$['
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !0Mx Bem
{ +L,V_z
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ GyZpdp!
SaveBmp(); yp!7^
return FALSE; nf0]<x2
} N*`qsv0
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (k^o[H F
CMenu pop; N;q)[Dr
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;Zy[2M
CMenu*pMenu=pop.GetSubMenu(0); L+X:M/)
pMenu->SetDefaultItem(ID_EXITICON);
ogvB{R
CPoint pt; qI%X/'
GetCursorPos(&pt); T!ww3d
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xjy(f~'
if(id==ID_EXITICON) YW2h#PV6_
DeleteIcon(); Ntt*}|:QV<
else if(id==ID_EXIT) FTQNS8
OnCancel(); 4o<rj4G>
return FALSE; *6bO2LO"
} ;EB^1*AEw
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x:6c @2
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |Zk2]eUO+
AddIcon(); nCS" l5
return res; 3`TD>6rs
} 6Qk[TL)t
@GWJq
3e
void CCaptureDlg::AddIcon() %XBMi~
{ dSI<s^n
NOTIFYICONDATA data; ;O7Vl5R
data.cbSize=sizeof(NOTIFYICONDATA); eBWgAf.k
CString tip; ]Zz.n5c
tip.LoadString(IDS_ICONTIP); ,rS?^"h9
data.hIcon=GetIcon(0); :2.<JUDM
data.hWnd=GetSafeHwnd(); !<3!ORFO
strcpy(data.szTip,tip); U0;pl2
data.uCallbackMessage=IDM_SHELL; EeR} 34
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :Y Ki
data.uID=98; +ag_ w}
Shell_NotifyIcon(NIM_ADD,&data); D&{CC
ShowWindow(SW_HIDE); v1rTl5H
bTray=TRUE; /Nkxb&
} YsMM$rjP+
`&9iC 4P
void CCaptureDlg::DeleteIcon() V}Ee1C
{ P1R5}i
NOTIFYICONDATA data;
LS$zA>:
data.cbSize=sizeof(NOTIFYICONDATA); CTS1."kx1
data.hWnd=GetSafeHwnd(); R GL2S]UFs
data.uID=98; c'>_JlG~
Shell_NotifyIcon(NIM_DELETE,&data); BwkY;Ur/AL
ShowWindow(SW_SHOW); *M)M!jTv
SetForegroundWindow(); s"XwO8yhM
ShowWindow(SW_SHOWNORMAL); Eq%f`Qg+1E
bTray=FALSE; /J(vqYK"
} Bf.iRh0Q5
ve+bR
void CCaptureDlg::OnChange() H,c`=Ii3
{ jfiUf1Mj
RegisterHotkey(); !B92W
} *7E#=xb
eyuyaSE
BOOL CCaptureDlg::RegisterHotkey() e=nvm'[h
{ L9<\vJ
UpdateData(); 9;'#,b*(
UCHAR mask=0; !Sw=ns7
UCHAR key=0; zO---}[9a
if(m_bControl) lWecxD$
mask|=4; T9I$6HAi
if(m_bAlt) *:Rs\QH
mask|=2; q-+:1E
if(m_bShift) MI'"Xzp{s
mask|=1; -pIz-*
key=Key_Table[m_Key.GetCurSel()]; uorX;yekC
if(bRegistered){ P6O\\,B1A
DeleteHotkey(GetSafeHwnd(),cKey,cMask); f9 \$,7F
bRegistered=FALSE; x1?mE)n]
} [@ev%x,
cMask=mask; pY@QR?F\
cKey=key; ;Y[D#Ja-
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); SDC'S]{ew
return bRegistered; &
Wod
} Uns%6o
9OV@z6
四、小结 y]0O"X-G
q~b# ml2QS
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。