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:
{LA?v& b'
W)o*$cu 一、实现方法
rhaq!s38: '+iLW~ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
]b1>bv% 69:-c@L0 #pragma data_seg("shareddata")
!z2xm3s{]p HHOOK hHook =NULL; //钩子句柄
fY78 UINT nHookCount =0; //挂接的程序数目
EvY^]M_U static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
%FqQ+0^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}C/+zF6q static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
{^;7DV: static int KeyCount =0;
,(sE|B#s static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
e$Yvy>I'tS #pragma data_seg()
*M#L)c;6 ;:R2 P@6f 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。
b&_Ifx_YF 7\nXJ381 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:
\x4:i\Fx@ ij3W8i9' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
cCx{
") cKey,UCHAR cMask)
)~nieQEZQ {
eFA,xzp BOOL bAdded=FALSE;
fF#Fc&B for(int index=0;index<MAX_KEY;index++){
)^6Os2 if(hCallWnd[index]==0){
`*kl> }$ hCallWnd[index]=hWnd;
1L7^g* HotKey[index]=cKey;
T9kc(i' HotKeyMask[index]=cMask;
s0x/2z bAdded=TRUE;
6
A#xFPYY{ KeyCount++;
RDy&i break;
lt2MB# }
Tj<B;f!u }
bNm]h. return bAdded;
b<"jmB{ }
<|82)hO //删除热键
*|CvK&7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MI:%Eq {
bt.3#aj BOOL bRemoved=FALSE;
^f"|<r for(int index=0;index<MAX_KEY;index++){
,D<U PtPQ if(hCallWnd[index]==hWnd){
GM)q\Hx{ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/P]N40_@ hCallWnd[index]=NULL;
3qH1\ HotKey[index]=0;
.J+F
HG' HotKeyMask[index]=0;
A+4Kj~`! bRemoved=TRUE;
{7%HK2=' KeyCount--;
b9-3 break;
C6@*l~j }
!su773vo }
?q2Yk/P }
R2 J A(Hn return bRemoved;
`f~$h?}3-@ }
!)W#|sys& Vw`Q:qo0:b MOp "kA DLL中的钩子函数如下:
e:.?T\
+`ov1h LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Iu >4+6 {
y>gw@+ BOOL bProcessed=FALSE;
~.0'v [N if(HC_ACTION==nCode)
[*0M$4 {
e#3RT8u# if((lParam&0xc0000000)==0xc0000000){// 有键松开
'Yc^9;C( switch(wParam)
j*4:4B% {
F8Mf,jnPs case VK_MENU:
=#<bB)59 MaskBits&=~ALTBIT;
5a)$:oO! break;
+Kg }R5+ case VK_CONTROL:
dZb;`DjTH MaskBits&=~CTRLBIT;
|R!ozlL{} break;
g)|vS>^~ case VK_SHIFT:
Vx>Q MaskBits&=~SHIFTBIT;
owVks-/ break;
nXI8 `7D default: //judge the key and send message
ib!TXWq break;
~
L>M-D4o }
&%qDi_UD for(int index=0;index<MAX_KEY;index++){
.c__T{<)[ if(hCallWnd[index]==NULL)
b0@K ~O;g continue;
Z5)v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}:;UnE} {
4*5 e0:O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3?L[ohKH?: bProcessed=TRUE;
U0{)goN. }
8pftc) k }
qfxEo76' }
M7 kWJ else if((lParam&0xc000ffff)==1){ //有键按下
z5Tsu1c switch(wParam)
7n+,!oJ {
`<|<1, case VK_MENU:
uwZ,l-6T MaskBits|=ALTBIT;
c14d0x{ break;
;$gV$KB:xA case VK_CONTROL:
~kSOYvK$' MaskBits|=CTRLBIT;
"Jg.)1Jw break;
NJ-Ji> w case VK_SHIFT:
gFu,q`Vf* MaskBits|=SHIFTBIT;
vNl)ltzJF break;
cs9h\]ZA default: //judge the key and send message
[m6+I9 break;
"+wkruC }
8"-=+w.CZ for(int index=0;index<MAX_KEY;index++){
op9vz[o#4 if(hCallWnd[index]==NULL)
>D}|'.& continue;
v-q-CI?B# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!IO\g"y~|% {
B$x@I\(M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
q5'G]j{,Z bProcessed=TRUE;
]FIIs58IM }
d!Gy#<H }
g;6/P2w }
n ]D io if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
]vn*eqd for(int index=0;index<MAX_KEY;index++){
W83PMiN"T- if(hCallWnd[index]==NULL)
jWi~Q o+ continue;
|O oczYf if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
WWZ<[[ > SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-1v9 //lParam的意义可看MSDN中WM_KEYDOWN部分
WG,1%=M@ }
m{X{h4t }
C<I?4WM }
q9j~|GE| return CallNextHookEx( hHook, nCode, wParam, lParam );
xU0iz{9 }
I2*(v%.- Fw{@RQf8 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:
wCR! bZ w =N{?ll6x7g BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
H@$K/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
k}&wy @SiV3k 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Tj_K5uccU} /HhA2 (g% LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
x>TIx[x {
V:J|shRo if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ecJjE
56P {
Mog [,{w //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
V4ePYud;^ SaveBmp();
F+Qnf'at1 return FALSE;
vN],9q }
rOt{bh6r …… //其它处理及默认处理
Y$n+\K }
R+(f~ j' :f39)g5> @-\=`#C** 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。
]?D$n DzE^FY 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
[7gz?9VyLF U,v`md@PX 二、编程步骤
YtSYe% h'=)dFw7 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
<ml?DXT
*~U.36 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qp6'n&^& H,w8+vZ4\ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
JvW7h(u7g [qRww]g;P| 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
%po;ih$jr* bF_0',W 5、 添加代码,编译运行程序。
3MHpP5C wdBBx\FP 三、程序代码
!]g[u3O ?zutU w/m ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
V
)oXJL #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
p qpsa' #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
hOZTD0 #if _MSC_VER > 1000
G`0{31us #pragma once
&R4?]I #endif // _MSC_VER > 1000
!w%c=V]tV #ifndef __AFXWIN_H__
^K1mh9O #error include 'stdafx.h' before including this file for PCH
6IT6EkiT #endif
S>(x x"Ia #include "resource.h" // main symbols
;r"r1'a+@ class CHookApp : public CWinApp
~< UYJc {
IO8 @u;& public:
Y#V(CIDe CHookApp();
qtZzJ>Y // Overrides
O*?^a7Z)4 // ClassWizard generated virtual function overrides
TK'
5NM+4 //{{AFX_VIRTUAL(CHookApp)
E8sM`2z5 public:
Ar/P%$Zfq virtual BOOL InitInstance();
;ZI8vFb virtual int ExitInstance();
n5A|Zjk; //}}AFX_VIRTUAL
R-Lpgi<a" //{{AFX_MSG(CHookApp)
Zh;}Q(w // NOTE - the ClassWizard will add and remove member functions here.
1/:vFX // DO NOT EDIT what you see in these blocks of generated code !
l}^ziY! //}}AFX_MSG
}#e=*8F7 DECLARE_MESSAGE_MAP()
w)vpo/? };
bIBF2m4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Z.@n7G BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x2)WiO/As BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
ZR3,dW6S BOOL InitHotkey();
9x4z m BOOL UnInit();
M61Nl)|mx& #endif
}\8-&VoY#X ~gZ1*8 s` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
|?0MRX0'g #include "stdafx.h"
<eSg%6z #include "hook.h"
=d5;F`m #include <windowsx.h>
2&:z[d}~H #ifdef _DEBUG
]=-=D9ZS3 #define new DEBUG_NEW
yxpv;v:)= #undef THIS_FILE
{e2ZW] static char THIS_FILE[] = __FILE__;
|*zgX]-+; #endif
H'!OEZ #define MAX_KEY 100
F^Jz
#define CTRLBIT 0x04
)_ !a: #define ALTBIT 0x02
$0$sDN6)x #define SHIFTBIT 0x01
\^y~w~g? #pragma data_seg("shareddata")
Nes|4Z< HHOOK hHook =NULL;
!WlL RkwO UINT nHookCount =0;
_I'k&R static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Sb2_&5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
z@19gD#8 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
K-Pcew^? static int KeyCount =0;
[Pp#r&4H static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{ GCp5 #pragma data_seg()
Q-R?y+| x HINSTANCE hins;
rf+}J_ void VerifyWindow();
M+ <SSi" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Wy6a4oY //{{AFX_MSG_MAP(CHookApp)
=<9Mv+Ry8 // NOTE - the ClassWizard will add and remove mapping macros here.
j&S.k // DO NOT EDIT what you see in these blocks of generated code!
[=cbzmX[ //}}AFX_MSG_MAP
$/Q\B(X3 END_MESSAGE_MAP()
P;gd!Yl<- jc:=Pe!E CHookApp::CHookApp()
qu$FpOJ
{
t6-fG/Kc // TODO: add construction code here,
ea$. + // Place all significant initialization in InitInstance
,s}&|+
'" }
GYf{~J ;IPk+,hpmi CHookApp theApp;
RlvvO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
K9ih(fh) {
~qL/P 5*+ BOOL bProcessed=FALSE;
tNZZCdB if(HC_ACTION==nCode)
NhYUSk ~u {
~LFM,@ if((lParam&0xc0000000)==0xc0000000){// Key up
"#8^":,4 switch(wParam)
oLlfqV,|L\ {
oGeV!hD case VK_MENU:
o(v7&m; MaskBits&=~ALTBIT;
]-X\n
break;
>N`,
3;Z case VK_CONTROL:
"k"+qR`fH MaskBits&=~CTRLBIT;
0?I break;
i,Jz7OX case VK_SHIFT:
U~7{q
> MaskBits&=~SHIFTBIT;
X>yE<ni break;
Mjl,/-0 w default: //judge the key and send message
zC[LcC*+J break;
P$ b5o }
?6N\AM' for(int index=0;index<MAX_KEY;index++){
u0[O /G if(hCallWnd[index]==NULL)
v{1g`E continue;
e2nZwPH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Bv*VNfUm {
}VH2G94Ll SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
drwxrZt bProcessed=TRUE;
Fo
,8"m }
0,__{?! }
'}>8+vU` }
chuJj
IY else if((lParam&0xc000ffff)==1){ //Key down
>:
@\SU switch(wParam)
Fghan.F {
>E,/|K* case VK_MENU:
<x$fD37 MaskBits|=ALTBIT;
%hBw)3;l break;
&s\,+d0 case VK_CONTROL:
1&=2" MaskBits|=CTRLBIT;
4h}\Kl break;
bhZ5-wo4% case VK_SHIFT:
\naG MaskBits|=SHIFTBIT;
$'a]lR break;
* _,yK-et default: //judge the key and send message
LzB*d break;
bX%4[BKP }
hNp.%XnnZ for(int index=0;index<MAX_KEY;index++)
,~K4+
t_ {
GsqO^SV if(hCallWnd[index]==NULL)
yW"}%)
d continue;
@$!"}xDR' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$7Lcn9?G {
cf_X=;yaqy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
itO1ROmu bProcessed=TRUE;
:3}K$ }
Q6[h;lzGV }
:f R GXrn }
;/^O7KM- if(!bProcessed){
P\
2Bx *e for(int index=0;index<MAX_KEY;index++){
WMoRosL74 if(hCallWnd[index]==NULL)
@c,=c+- continue;
-]Oi/i, { if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ck`$ ` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yv5c0G.D }
"9H#pj - }
E{}eYU }
.ityudT< return CallNextHookEx( hHook, nCode, wParam, lParam );
@hOY& }
TrHUM4 w:9n/[ BOOL InitHotkey()
.lppT)P {
c5HW.3" if(hHook!=NULL){
4wwRNu* nHookCount++;
B|BJkY' return TRUE;
4f,%@s)zn }
5kj=Y]9\I else
}/.b@`Dh; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
)$FwB6^ if(hHook!=NULL)
N5fMMi(O nHookCount++;
0OVxx>p/x return (hHook!=NULL);
`ve5>aw0_Y }
Ml,87fo BOOL UnInit()
}nNCgH {
X57\sggK if(nHookCount>1){
Pexg"328 nHookCount--;
QEq>zuz5; return TRUE;
WAh{*$Rpl }
Hh<}~s BOOL unhooked = UnhookWindowsHookEx(hHook);
pS)/yMlVj if(unhooked==TRUE){
;KW}F| nHookCount=0;
Z <tJ+ hHook=NULL;
l,M? }
s$OnQc2/ return unhooked;
&1Idv}@! }
ais"xm<V r}])V[V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A!!W\Jt {
5ayH5=(t BOOL bAdded=FALSE;
D&#ph%U,P for(int index=0;index<MAX_KEY;index++){
&]H Y: if(hCallWnd[index]==0){
1C\[n(9 hCallWnd[index]=hWnd;
WJ$!W HotKey[index]=cKey;
c27A)`
HotKeyMask[index]=cMask;
q%GlS=o" bAdded=TRUE;
FOd)zU*L2 KeyCount++;
!XS ;&s7[* break;
YXhxzH hPd }
`G^MTDp?L+ }
;?0k> return bAdded;
3)+}2 }
D>Dch0{H,: 3 ]}wZY0 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0SLS;s.GX {
=7uxzg/%Tj BOOL bRemoved=FALSE;
W-+~r for(int index=0;index<MAX_KEY;index++){
ht%:e?@i if(hCallWnd[index]==hWnd){
v-mhqhb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
\sZ!F&a~ hCallWnd[index]=NULL;
h*9s^`9) HotKey[index]=0;
*XZlnO HotKeyMask[index]=0;
>|22%YVX bRemoved=TRUE;
h"{Z%XPX# KeyCount--;
&(Ot(. break;
}?jL;CCe }
xr*hmp1 }
'XHKhpm< }
ki[Yu+';} return bRemoved;
WS?"OTH.^\ }
h{&}p-X&[ 3-5X^!C void VerifyWindow()
\]eB(&nq {
?|t9@r for(int i=0;i<MAX_KEY;i++){
q'%-8t if(hCallWnd
!=NULL){ G'sEbw'[
if(!IsWindow(hCallWnd)){ s*k[Fbi
hCallWnd=NULL; #PpmR_IX
HotKey=0; Z;6v`;[
HotKeyMask=0; ?UlAwxn
KeyCount--; L`Lro:E?kL
} 3~7X2}qU
} &nk[gb
o\
} `|\z#Et
} Q^qdm5}UkW
`$*cW1
BOOL CHookApp::InitInstance() jF}u%T)HL
{ O]SjShp
AFX_MANAGE_STATE(AfxGetStaticModuleState()); VuqJ&U.-
hins=AfxGetInstanceHandle(); `c zL$tN<P
InitHotkey(); 6 ZutU ~HS
return CWinApp::InitInstance(); %,G&By&,
} k/&~8l.$
WxB}Uh
int CHookApp::ExitInstance() I$7#Z!P6|
{ [4u.*oL&
VerifyWindow(); M~Tx4_t
UnInit(); _<`j?$P
return CWinApp::ExitInstance(); Bn 5]{Df
} GS%ACk
b42"Y,sbB
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #-wtNM%1#
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x4&<Vr
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^a6c/2K
#if _MSC_VER > 1000 DeTx7 i0
#pragma once &QaFX,N"
#endif // _MSC_VER > 1000 Bw]Y71
6PF7Wl7.
class CCaptureDlg : public CDialog L{py\4z'_
{ Flrpk`4
// Construction 'rZYl Qm
public: h JVy-]
BOOL bTray; 2m]CmdV^
BOOL bRegistered; s}NE[Tw
BOOL RegisterHotkey(); "enGWIH
UCHAR cKey; !Nu ~4
UCHAR cMask; n*UD0U}`
void DeleteIcon(); K+=cNC4B
void AddIcon(); u|v2J/_5Y
UINT nCount; ]!JUiFj"uD
void SaveBmp(); 8reis1]2S
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \uT2)X( N
// Dialog Data R4 8w\?L
//{{AFX_DATA(CCaptureDlg) X,)`<
>=O
enum { IDD = IDD_CAPTURE_DIALOG }; |yqL0x0\l
CComboBox m_Key; MGt[zLF9
BOOL m_bControl; `1AVw]k
BOOL m_bAlt; oCw>b]S
BOOL m_bShift; ]kXiT Yg
CString m_Path; ^lB=O
CString m_Number; Hs}3c
R}
//}}AFX_DATA I
,j,Hz0
// ClassWizard generated virtual function overrides S}@J4}*u["
//{{AFX_VIRTUAL(CCaptureDlg) 2pKkg>/S
public: n};:*N!
v
virtual BOOL PreTranslateMessage(MSG* pMsg); r#svj*dn
protected: yK1@`3@?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]LcCom:]
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~F gxhK2+
//}}AFX_VIRTUAL )Z.v fc
// Implementation >iZ"#1ZL2O
protected: 8dgi"/[3
HICON m_hIcon; F$tshe(
// Generated message map functions Owe"x2D\
//{{AFX_MSG(CCaptureDlg) J>@T'#
virtual BOOL OnInitDialog(); zv~dW4'
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v-
793pr
afx_msg void OnPaint(); 'AU:[eyUV
afx_msg HCURSOR OnQueryDragIcon(); }Kt`du=
virtual void OnCancel(); F.]D\"0`
afx_msg void OnAbout(); pTQ70V3
afx_msg void OnBrowse(); <D_UF1Pk
afx_msg void OnChange(); T[M:%vjYF
//}}AFX_MSG [:CV5k~xc
DECLARE_MESSAGE_MAP() wFe?0u
}; !HV<2q()
#endif f ye=8
r
W 'w{}|
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jpGZ&L7i&
#include "stdafx.h" >}"9heF
#include "Capture.h" 0*=[1tdWY
#include "CaptureDlg.h" yH9(ru
#include <windowsx.h> ktA5]f;
#pragma comment(lib,"hook.lib") b.N$eJlQ&
#ifdef _DEBUG SS)9+0$
#define new DEBUG_NEW bgk+PQ#S-
#undef THIS_FILE h4 X=d5qd
static char THIS_FILE[] = __FILE__; fTq/9=Rq4
#endif ><&>JgM
#define IDM_SHELL WM_USER+1 ZC99/NWN
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HQy:,_f@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); prk@uYCa =
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >bLhCgF:"
class CAboutDlg : public CDialog "mtEjK5
{ l_2B
public: a'Vz|SG
CAboutDlg(); 'vP"&lrn
// Dialog Data hy]8t1894
//{{AFX_DATA(CAboutDlg) k#oe:u`<
enum { IDD = IDD_ABOUTBOX }; |7$Q'3V
//}}AFX_DATA x+Ws lN2a
// ClassWizard generated virtual function overrides P9W!xvV`w
//{{AFX_VIRTUAL(CAboutDlg) _k|k$qxE
protected: >d9b"T
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @'>Ul!.]
//}}AFX_VIRTUAL 9OS~;9YR
// Implementation 59l9^<{A
protected: (g*mC7 HN
//{{AFX_MSG(CAboutDlg) v;WfcpWq2
//}}AFX_MSG %7S{g
DECLARE_MESSAGE_MAP() CZzgPId%x
}; hN U.y
.3
S9=d?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?^by3\,VZ
{ 1)BIh~1{p
//{{AFX_DATA_INIT(CAboutDlg) p[8H!=`K
//}}AFX_DATA_INIT MwHxn%
} J5zKwt
O4g2s8k
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 84g8$~M
{ "Q.KBX v/
CDialog::DoDataExchange(pDX); Njmb{L]Cps
//{{AFX_DATA_MAP(CAboutDlg) +Y_]<
//}}AFX_DATA_MAP 0PdX>h.t
} f5`q9w_c
0 /)OAw"m
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tE$oV
//{{AFX_MSG_MAP(CAboutDlg) *JA0Vs5
// No message handlers Ge=|RAw3
//}}AFX_MSG_MAP vPSY1NC5
END_MESSAGE_MAP() ]^6r7nfR6|
\B
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qir8RPW
: CDialog(CCaptureDlg::IDD, pParent) Yc-gJI*1
{ [+wLy3_
//{{AFX_DATA_INIT(CCaptureDlg) tL\L4>^7T
m_bControl = FALSE; A2%RcKY7
m_bAlt = FALSE; A kEt=vI
m_bShift = FALSE; YfUo=ku
m_Path = _T("c:\\"); G\B:iyKl
m_Number = _T("0 picture captured."); Z5Tu*u=
nCount=0; [<JY[o=
bRegistered=FALSE; fU>4Ip1?y/
bTray=FALSE; swfjKBfw+g
//}}AFX_DATA_INIT Kwo0%2Onkd
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4Jk[X>I~
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
+wE>h>?;
} Z!z#+G
IQyw>_~]
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -cB>; f)5r
{ yaK4% k
CDialog::DoDataExchange(pDX); T1A/>\Ns
//{{AFX_DATA_MAP(CCaptureDlg) F
@uOXNz)
DDX_Control(pDX, IDC_KEY, m_Key); uC5W1LyI
DDX_Check(pDX, IDC_CONTROL, m_bControl); )rbcY0q
DDX_Check(pDX, IDC_ALT, m_bAlt); ,h},jkY4
DDX_Check(pDX, IDC_SHIFT, m_bShift); yUX<W'-Hev
DDX_Text(pDX, IDC_PATH, m_Path); ]DK.4\^
DDX_Text(pDX, IDC_NUMBER, m_Number); t/c)[l hV
//}}AFX_DATA_MAP Jyyr'1/<k
} qFwAzW;"
K{`3,U2Wx
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) nq*D91Q
//{{AFX_MSG_MAP(CCaptureDlg) g)=-%n'RoE
ON_WM_SYSCOMMAND() im@c||
ON_WM_PAINT() s>a(#6Q
ON_WM_QUERYDRAGICON() hEfFMi=a`
ON_BN_CLICKED(ID_ABOUT, OnAbout) HC
RmW'
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :pGgxO% q
ON_BN_CLICKED(ID_CHANGE, OnChange) r^ +n06[
//}}AFX_MSG_MAP `m\l#r2C
END_MESSAGE_MAP() FK,Jk04on
SAUG+{Uq
BOOL CCaptureDlg::OnInitDialog() f= 33+8I
{ ke5_lr(
CDialog::OnInitDialog(); ;f~z_3g
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1*]@1DJt
ASSERT(IDM_ABOUTBOX < 0xF000); ^e:rRk7 &
CMenu* pSysMenu = GetSystemMenu(FALSE); K~jN"ev
if (pSysMenu != NULL) OYY_@'D
{ X m%aT
CString strAboutMenu; b)+;@wa~
strAboutMenu.LoadString(IDS_ABOUTBOX); c3|/8
if (!strAboutMenu.IsEmpty()) h 7*#;j
{ H
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pSysMenu->AppendMenu(MF_SEPARATOR); RRJN@|"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @EGUQ|WL^
} I#GsEhi
} IjrjLp[z$
SetIcon(m_hIcon, TRUE); // Set big icon (0QYX[(r~o
SetIcon(m_hIcon, FALSE); // Set small icon RiCzH
m_Key.SetCurSel(0);
%( o[Hsl
RegisterHotkey(); U66 zm9
3&
CMenu* pMenu=GetSystemMenu(FALSE); FW!1 0K?
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =f-.aq(G/
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o3xfif
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `yWWX.`
return TRUE; // return TRUE unless you set the focus to a control = ms
o1
} q@&.)sLPgO
he1OLk
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l@nG?l #
{ X?Z#k~JR
if ((nID & 0xFFF0) == IDM_ABOUTBOX) e!|T Tap
{ b}5hqIy
CAboutDlg dlgAbout; qC$h~Epp4
dlgAbout.DoModal(); xN]88L}Tn
} {;Ispx0m
else *q+z5G;O
{ bF{14F$
CDialog::OnSysCommand(nID, lParam); @qWes@
} yct^AN|%
} B;mt11M
^q
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void CCaptureDlg::OnPaint() UXN!iU)
{ )a'c_ 2[
if (IsIconic()) $l!+SLK
{ ~R\Z&oQ
CPaintDC dc(this); // device context for painting 4'ymPPY
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *C n `pfO
// Center icon in client rectangle En]+mIEo
int cxIcon = GetSystemMetrics(SM_CXICON); y:N>t+'5
int cyIcon = GetSystemMetrics(SM_CYICON); >"q~9b
A
CRect rect; Kv26rY8Q
GetClientRect(&rect); _/zK^S)
int x = (rect.Width() - cxIcon + 1) / 2; d
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int y = (rect.Height() - cyIcon + 1) / 2; }I;5yk,o
// Draw the icon ^@0-E@ {c
dc.DrawIcon(x, y, m_hIcon); @(_M\>!%M
} `&-)(#
else (e$/@3*
{ MGzuQrl{H
CDialog::OnPaint(); MVpk/S%W
} !\%0O`b^4
} l;gj],*
(ON_(MN
HCURSOR CCaptureDlg::OnQueryDragIcon() q:D!@+U
{ ,`lVB#|
return (HCURSOR) m_hIcon; #r4S%
} k TLA["<m
8 O5@FU
3
void CCaptureDlg::OnCancel() uBe1{Z
{ ;f8$vW];
if(bTray) 5c~OG6COx
DeleteIcon(); pWwB<F
CDialog::OnCancel(); ages-Z_X
} E"P5rT
D|1pBn.b]'
void CCaptureDlg::OnAbout() dU~DlaEy(
{ `Oc`I9
CAboutDlg dlg; `ju r`^S|
dlg.DoModal(); p<@0b
} N8>;BHBV!
!%x=o&
void CCaptureDlg::OnBrowse() fJ?$Z|
{ u/% 4WgA
CString str; AF
qut
BROWSEINFO bi; 7Lr}Y/1=
char name[MAX_PATH]; ms%Ot:uA
ZeroMemory(&bi,sizeof(BROWSEINFO)); myj^c>1Iz
bi.hwndOwner=GetSafeHwnd(); ;rj=hc
bi.pszDisplayName=name; m*h, <,}-+
bi.lpszTitle="Select folder"; q?=eD^]
bi.ulFlags=BIF_RETURNONLYFSDIRS; &&w7-
LPITEMIDLIST idl=SHBrowseForFolder(&bi); %0PZZl5b
if(idl==NULL) #0HF7C3
return; (\si/&
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K%: :
str.ReleaseBuffer(); uxq!kF'Ls
m_Path=str; nJTV@mXVq
if(str.GetAt(str.GetLength()-1)!='\\') aQ ~
m_Path+="\\"; VvwQz#S
UpdateData(FALSE); r"a4;&mf
} NC;4
9oteQN{9
void CCaptureDlg::SaveBmp() Uv6#d":f;
{ iaR^] |7_
CDC dc;
9Q".166
dc.CreateDC("DISPLAY",NULL,NULL,NULL); :B=p%C
CBitmap bm; %^=fjJGV{~
int Width=GetSystemMetrics(SM_CXSCREEN); *R*Tmo"
int Height=GetSystemMetrics(SM_CYSCREEN); y?-wjJS>
bm.CreateCompatibleBitmap(&dc,Width,Height); Riq5Au?*)
CDC tdc; =;{vfjj
tdc.CreateCompatibleDC(&dc); K5Fzmo a
CBitmap*pOld=tdc.SelectObject(&bm); $cev,OW6]
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dG|srgk+
tdc.SelectObject(pOld); lqOv_q
BITMAP btm; q_8qowu"
bm.GetBitmap(&btm); K<b -|t9f
DWORD size=btm.bmWidthBytes*btm.bmHeight; )gNHD?4x
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); GYiUne$
BITMAPINFOHEADER bih; Gb%PBg}HH
bih.biBitCount=btm.bmBitsPixel; S
~lw5
bih.biClrImportant=0; O{rgZ/4Au
bih.biClrUsed=0; VGBL<X
bih.biCompression=0; 17G7r\iNYq
bih.biHeight=btm.bmHeight; 8zz-jkR
bih.biPlanes=1; .1MXQLy
bih.biSize=sizeof(BITMAPINFOHEADER); \z8TYx@
bih.biSizeImage=size; AKM\1H3U
bih.biWidth=btm.bmWidth; &l%#OI}OE
bih.biXPelsPerMeter=0; Gq;0j:?CC
bih.biYPelsPerMeter=0; Z{RgpVt
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +D1;_DU
static int filecount=0; *#EyfMz-B
CString name; 9Dd/g7
name.Format("pict%04d.bmp",filecount++); &%J{C3Q9
name=m_Path+name; `c{i+
BITMAPFILEHEADER bfh; SsafRK$
bfh.bfReserved1=bfh.bfReserved2=0; *D]/V U
bfh.bfType=((WORD)('M'<< 8)|'B'); $$\| 3rj!
bfh.bfSize=54+size; Lm'Ony^F
bfh.bfOffBits=54; }?>30+42:
CFile bf;
4MRHz{`wa
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T:wd3^.CG
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (XT^<#Ga
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H"I|dK :
bf.WriteHuge(lpData,size); g<KBsz!{
bf.Close(); k$o6~u 2&
nCount++; Qd]-i3^0
} RsVba!x@
GlobalFreePtr(lpData); m+DkO{8F
if(nCount==1) Yk<?HNf
m_Number.Format("%d picture captured.",nCount); [F+lVb
else ?mRU9VY
m_Number.Format("%d pictures captured.",nCount); =5^L_, 4c2
UpdateData(FALSE); sKjg)3Sl
} ^5u}
N+!{Bt*
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HnioB=fc
{ 5Z6$90!k
if(pMsg -> message == WM_KEYDOWN) Y.F:1<FAtf
{ #)=P/N1
if(pMsg -> wParam == VK_ESCAPE) $CHri|
return TRUE; 5@Ot@o
if(pMsg -> wParam == VK_RETURN) tB}&-U|t[~
return TRUE; O,9KhX+
} z{``v|K
return CDialog::PreTranslateMessage(pMsg); u Dm=W36
} K!HSQ,AC
z9&$Xao
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Gnj|y?'
{ -`iZBC50
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vlm&)DIt
SaveBmp(); TS$ 2K
return FALSE; #<4h
Y7/
} 5"^$3&)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?8b?{`@V
CMenu pop; (tx6U.Oy
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \ tF><
CMenu*pMenu=pop.GetSubMenu(0); J03yFT,dF
pMenu->SetDefaultItem(ID_EXITICON); bb+-R_3Kd
CPoint pt; [=7|LHjU
GetCursorPos(&pt); 5RI"gf
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2m[z4V@`
if(id==ID_EXITICON) b!5W!vcK
DeleteIcon(); wb.47S8
else if(id==ID_EXIT) EF qWnz
OnCancel(); : )cPc7$8
return FALSE; g"hm"m}i
} K\5@yqy5
LRESULT res= CDialog::WindowProc(message, wParam, lParam); u
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if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rrwBsa3
AddIcon(); $3W[fC
return res; o.keM4OQ
} )(_}60
a 5:YP
void CCaptureDlg::AddIcon() 2jOh~-LU
{ }R;.~F
NOTIFYICONDATA data; bQrH8)
data.cbSize=sizeof(NOTIFYICONDATA); r|{h7'
CString tip; 1<\@i{;xsU
tip.LoadString(IDS_ICONTIP); Siq2Glg_
data.hIcon=GetIcon(0); tl
(2=\
data.hWnd=GetSafeHwnd(); @F+4
NL-'P
strcpy(data.szTip,tip); Ky8sLm@
data.uCallbackMessage=IDM_SHELL; K;sH0*
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Zq}w}v
data.uID=98; 0V1)ou84'
Shell_NotifyIcon(NIM_ADD,&data); O1ofN#u
ShowWindow(SW_HIDE); nz3j";d
bTray=TRUE; g>1yQ
} %r=uS.+hrF
\rF6"24t6
void CCaptureDlg::DeleteIcon() zy"L%i
{ \|F4@
NOTIFYICONDATA data; q?nXhUD
data.cbSize=sizeof(NOTIFYICONDATA); M$B9?N6
data.hWnd=GetSafeHwnd(); E!8FZv8
data.uID=98; 9gZMfP
Shell_NotifyIcon(NIM_DELETE,&data); /XeDN-{
ShowWindow(SW_SHOW); *!$4
SetForegroundWindow(); rr>QG<i;G
ShowWindow(SW_SHOWNORMAL); &na#ES$X,
bTray=FALSE; wc*5s7_
} h3Nwxj~E
.{1G"(z
void CCaptureDlg::OnChange() 1XSA3;ZEc
{ #g#vDR!
RegisterHotkey(); "o2p|2c
} AjKP -[
J*o :RnB
BOOL CCaptureDlg::RegisterHotkey() g{.>nE^Sc5
{ I= G%r/3
UpdateData(); W=c7>s0>
UCHAR mask=0; d rnqX-E;
UCHAR key=0; -wH#B<'
if(m_bControl) ;5:g%Dt
mask|=4; ZM K"3c9
if(m_bAlt) <W~5;m
mask|=2; bZHuEh2w
if(m_bShift) O$k;p<?M
mask|=1; es]\xw
key=Key_Table[m_Key.GetCurSel()]; l TY%,s
if(bRegistered){
_CY>45
DeleteHotkey(GetSafeHwnd(),cKey,cMask); :y==O4
bRegistered=FALSE; xphw0Es
} ` wuA}v3!
cMask=mask; QWH1xId
cKey=key; o,[~7N
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); blNE$X+0|
return bRegistered; t
j&+HC
} qR4('
LuY`mi
四、小结 ot]eaad
Tl5K'3
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。